Figp. 14-26. Leiœopsacns ortJiotïocus Ii. Pp. .34-46. 



Fig. 14. One of the type specimens (Sei. Coll. Mos. öp. No. 230). Nat. size. 

 Fig. 15. Longitudinal section of wall stained ; above, the oscular edge. 



(Sei. Coll. Mus. Sp. No. 438). 3 x. 

 Fig. 16. Hexactinose discohexaster of an average size. 300 x. From Sp. 



No. 230. 

 Fig. 17. Hexasteroiis discohexiister, from the same specimen. 300 x . 

 Fig. 18-20. Same, from Sp. No. 438, Fig. 20 represents an occasional 



form. 300 x . 

 Fig. 21. Egg-like cell of doubtful origin and nature, found in S[).No.230. 300 x . 

 Fig. 22. A moderately large-sized arcluxjocyte-congeries, drawn from a 



section. The spherules represent nuclei. 300 x . 

 Fig. 23, Larva in an early development stage, yet without spicules. Seen 



in optical section. 300 x . 

 Fig. 24, Older larva of alwut 70// diameter; in o[ttical section, but all 



the si)icules in a hemisphere, seen by dil'i'erent foci of the mi- 

 croscope, arc drawn in. Histologic il elements in th.e central ])art a 



little too distinctly shown. 300 x , 

 Fig. 2.5. Oldest larva observed ; all the spicules of the upper hemisphere 



drawn in. 300 .< . 

 Fig. 26. Combination of sections to show spiculation of wall. Above, the 



dermal ; below, the gastral, surface. About .50 x . 



Figs. 27-37. Leiccopsacws scoliodocus Ij. Pp. 46-.52. 



Fig. 27. Type specimens. The largest in the middle is Sei. Coll. Mus, Sp. 



No. 233 ; the two others are from Sp. No. 23.5. Nat. size. 

 Fig. 28. Stained longitudinal section of an entire s[)ecimen. Basidictyonal 



mass at base. 3 x . 

 Fig, 29, Hexactinose discohe.Kaster, 300 x , 

 Fig. 30. Portion of same, showing the extent of axial threads in the 



central node. 

 Fig. 31. Delicate tylflorioome of inconstant occurrence, from Sp.No.434. 300 x . 

 Fig. 32. Spherical discohexaster, from Sp. No. 233. 300 x . 

 Fig. 33. Portion of same, showing the short principal. 



Fig. 34. Small form of spherical discohexaster, from Sp. No, 235. 300 x . 

 Fig. 35. Unusually large discohexaster, occassionally met with. From Sp, 



No, 233. ,300 X. 

 Fig. 36 Ptare form of discohexaster. From Sp. No. 235. 300 x . 

 Fig. 37. danbination of sections to show spiculation of wall. Above, the 



dermal ; below, the gastral surface. About .50 x . 



