478 Mr. H. J. Carter on Deep-sea 



botli tlie last species, only one fignre lias been given ; but it 

 should be remembered that while it varies in length in both 

 species, especially in the latter, it is generally three times the 

 length in P. amt/f/da/oides that it is in P. geodioicles. 

 Fif/. 24 HaUchondria abi/ssi ('Annals,' 1874, vol. xiv. p. 245, pi. xiv. 

 fig. 2, c), " embryonic form " of flesh-spicule (anchorate), mag- 

 nified, to show that it is birotulate : a, lateral view ; b, end 

 view. 



Plate XV. 



Fig. 25. DictyocijUndrus ahjssorvm, skeleton-spicules : a, large ; h, small. 



Scale l'-24th to 1 -1800th inch. 

 Fig. 26. Hipneraphia erecta, skeleton-spicules : a, large ; b, small. Scale 



l-24th to l-1800th inch. 

 Fiff. 27. Dictyocylindrus virgidtosus, Bk., skeleton-spicule. Scale l-24th 



to l'-18b0th inch. 

 Fig. 28. Cormdum textile, skeleton-spicules : «, large ; b, small. Scale 



l-24th to 1 -6000th inch. 

 Fig. 29. HaUchondria foliata, Bk., skeleton-spicules : a, large ; b, small. 



Scale l-24th to l-6000th inch. 

 Fig. 30. Plumohalicliondria inicrocio)iides, skeleton-spicules : a, large ; 



b, small. Scale l-48th to l-6000th inch. 

 Fig. 31. Microciona longispicidum, skeleton- and flesh-spicules : a, large ; 



i, small; c, flesh or echinatiug spicule. Scale l-24th to l-1800th 



inch. 

 Fig. 32. Esperia j^kicoides, skeleton-spicule. Scale l-48th to l-6000th 



inch. 

 Fig. 33. Enperia borassus, skeleton-spicule. Scale l-48th to l-6000th 



inch. 

 Fig. 34. Fsperia ctipressifonnis, rar.bikaiiiatif era, skeleton-ST[i\cule: a, body 



form; b, surface form. Scale 1-1 2th to l-1800th inch. 

 Fig. 35. Halichondria phlyctenodes, skeleton-spicule. Scale l-48th to 



1 -6000th inch. 

 Fig. 36. CribreUa hospitalis, Sdt., skeleton-spicules : a, large ; b, small. 



Scale l-24th to l-6000th inch. 

 Fi(i. 37. HaUchondria forcipis, Bk., var. bnlbosa, skeleton-spicules : a, 



large ; b, small. Scale l-24th to l-6000th inch. 

 Fig. 38. CometeUa pyrula, skeleton-spicule. Scale l-48th to l-6000th 



inch. 

 Fig. 39. Hymeraphia verticilluta, Bk., var. erecta, skeleton-spicules : a, 



large; b, small or centrally inflated. Scale l-24th to l-1800th 



inch. 

 Fig. 40. Stelletta pachastreUnides. a, large acerate skeleton- or " body- 



spicule ; " b, three-armed " zone-spicule ; " c, anchoring-spicule ;" 



d, microspined subskeleton-spicule : all on the same scale, viz. 



l-48th to l-1800th inch, e, microspined flesh-spicule, more 



magnified ; /, large stellate spicule with conical rays spiniferous ; 



g, minute bistellate spicule with linear raj^s : scale of/& g, 1- 



12th to l-6000th inch, h, head of anchoring-spicule, more mag- 

 nified ; i, microspined subskeleton acerate spicule, more mag- 

 nified. 

 Fig. 41. Pachastrella intexta, quinqueradiate skeleton-spicule, scale l-24th 



to l-6000th inch, a, bacilliform blunt-spined flesh-spicule ; 



b, bistellate minute flesh-spicule with linear rays : scale l-12th 



to 1-OOOOth inch. 



