These are the members of the octet regiment (first listed in category 1) with o3o3o3o3*a (cyclotettic) symmetry. Their vertex figures are tetrahedrally-symmetric facetings of a cuboctahedron. This category mostly corresponds to Bowers' Category 18 polychora.
263. Datteha - Ditetrahedronary tetrahemiapeiratic honeycomb. Cells are tets and ditathas. Verf is an antitruncated tetrahedron (looks like four tets joined at a point). Symbol is o3o3/2x~o3*b.
264. Dattoha - Ditetrahedronary tetraoctahemiapeiratic honeycomb. Cells are tets, octs, and ditathas.
265. Dattetuthah - Ditetrahedronary tetratomotetrahemihexagonal honeycomb. Cells are tets, tuts, and hexats in compounds of three.
266. Dattotuthah - Ditetrahedronary tetraoctatomotetrahemihexagonal honeycomb. Cells are tets, octs, tuts, and hexats.
267. Datetcoha - Ditetrahedronary tetracuboctahemiapeiratic honeycomb. Cells are tets, coes, and ditathas.
268. Datet Tocohaht - Ditetrahedronary tetratomotetracuboctahemihexagonal honeycomb. Cells are tets, tuts, coes, and hexats.
269. Dattuthoha - Ditetrahedronary tomotetrahemioctahemiapeiratic honeycomb. Cells are tuts, ohoes, and ditathas.
270. Datetutho - Ditetrahedronary tetratomotetrahemioctahedral honeycomb. Cells are tets, tuts, and ohoes.
271. Radtetutho - Retroditetrahedronary tetratomotetrahemioctahedral honeycomb. Cells are tets, tuts, and choes.
272. Radtatuthoha - Retroditetrahedronary tomotetrahemioctahemiapeiratic honeycomb. Cells are tuts, choes, and ditathas.
273. Datotuthoha - Ditetrahedronary octatomotetrahemioctahemiapeiratic honeycomb. Cells are octs, tuts, choes, and ditathas.
274. Datet Tuthoth - Ditetrahedronary tetratomotetrahemioctahemitriangular honeycomb. Cells are tets, tuts, choes, and trats.
275. Dattotutho - Ditetrahedronary tetraoctatomotetrahemioctahedral honeycomb. Cells are tets, octs, tuts, and choes.
These ones have thahs and squats as cells and have no analog in Bowers' category 18, as the edges in the vertex figure corresponding to the hemi-squares are not planar in those categories.
276. Datethahsh - Ditetrahedronary tetrahemihexahemisquare honeycomb. Cells are tets, thahs, and squats. Symbol is (o3o3o4s4/3*a)/2. This is the alternation of cuhsquah from category 1.
277. Datet Hahthash - Ditetrahedronary tetrahemihexahemitriangular hemisquare honeycomb. Cells are tets, thahs, trats, and squats.
278. Dathahasha - Ditetrahedronary hemihexahemisquare hemiapeiratic honeycomb. Cells are thahs, ditathas, and squats.
279. Datet Dituthahash - Ditetrahedronary tetradistomotetrahemihexahemisquare honeycomb. Cells are tets, tuts in two orientations, thahs, and squats.
280. Datdut Thahasha - Ditetrahedronary distomotetrahemihexahemiapeiratihemisquare honeycomb. Cells are tuts in two orientations, thahs, ditathas, and squats.
281. Dattut Hahahash - Ditetrahedronary tomotetrahemihexahemihexagonal hemisquare honeycomb. Cells are tuts, thahs, hexats, and squats.
282. Dattutho Hahash - Ditetrahedronary tomotetrahemioctahemihexahemisquare honeycomb. Cells are tuts, ohoes, thahs, and squats.
283. Datetho Hahahash - Ditetrahedronary tetrahemioctahemihexahemihexagonal hemisquare honeycomb. Cells are tets, ohoes, thahs, hexats, and squats.
The following honeycombs are self conjugate: all.
The following form conjugate pairs: none.