478 Mr. 11. J. Carter on Deep-sea 



both the last species, only one figure has 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. amygdalmdes that it is in P. yeodioides. 

 Fig. 24. Halichondria 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 : o, lateral view ; b, end 

 view. 



Plate XV. 



Fiff. 25. Dicfi/oci//indrus abi/ssoritm, skeleton-spicules : a, lai'ge ; b, small. 



Scale l"-24tli to l-1800th inch. 

 Fig. 26. Hipneraphia erecta, skeleton-spicules : a, large ; 6, small. Scale 



l-24th to l-1800th inch. 

 Fig. 27. Dicti/oci/liiidnts virguUosus, Bk., skeleton-spicule. Scale l-24th 



to l-lSOOth inch. 

 Fig. 28. Cormdum textile, skeleton-spicules : o, large ; &, small. Scale 



l-24th to l-6000th inch. 

 Fig. 29. Halichondria fuliata, Bk., skeleton-spicules : a, large ; 6, small. 



Scale l-24th to l-UOOOth inch. 

 Fig. 30. Phimohalichondria microcionides, skeleton-spicules : a, large ; 



6, small. Scale l-48th to l-GOOOth inch. 

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



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



inch. 

 Fig. 32. Esperia placoides, skeleton-spicule. Scale l-48th to l-6000th 



inch. 

 Fig. 33. Fsperia boi'assus, skeleton-spicule. Scale l-48th to l-6000th 



inch. 

 Fig. 34. Fsperia cupressiformis,\aT.biha7natifera,ske\eton-aTpicu\e: a, body 



form; 6, surface form. Scale I-l 2th to l-1800th inch. 

 Fig. 36. Halichondria phlgctenodes, skeleton-spicule. Scale l-48th to 



l-6000th inch. 

 Fig. 36. Cribrella hospitalis, Sdt., skeleton-spicules : a, large ; 5, small. 



Scale l-24th to 1-OOOOth inch. 

 Fig. 37. Halichondria forcipis, Bk., var. hidbosa, skeleton-spicules : a, 



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

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



inch. 

 Fig. 39. Hijmeraphia verticillata, Bk., var. erecta, skeleton-spicules : a, 



large; b, small or centrally inflated. ■ Scale l-24th to l-18(X)th 



inch. 

 Fig. 40. Stelletta pachastrelloides. «, large acerate skeleton- or '^ bodj'- 



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



d, niicrospined subskeleton-spicide : 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 rays: 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. Pachasfrella intexta, quinqueradiate skeleton-spicule, scale l-24th 



to 1-GOOOth inch, a, bacilliform blunt-spined flesh-spicule ; 



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



to l-f3000th inch. 



