THE SPONGES (PORIFERA) ' ^jj 



34 (33) Birotulates many times longer than diameter of rotules. 



Ephydatia crater ijor mis (Potts) 1882. 



Sponge encrusting, thin. Gemmules small, white very numern.,.. Pro 1 , ' 



mules extremely thick, the foraminal tubes in a Vr'?f?rZT M P^anular crust of gem- 



which may be the same as this species The d^sprfSinn " '/ ^ ' 

 ulates^w.th short hooked ra?s; suppSd^i^ii' K" T^'' ^Mill 



35 (20, 36) Dermal spicules, minute birotulates. 



Ephydatia everetti (Mills) 



[884. 



36 (20, 



Sponge green consisting entirely of slender filaments little more 

 than a sixteenth of an inch in diameter. Gemmules few but ^?u 

 smnofh^'n^'^ a thick crust. Skeleton spicules slender! cyHndrkd' 

 S? I^erma spicules, minute birotulates with slender cyhndncai 

 shafts and cap-like rotules notched into five or six hooks GemmS 

 formed'oTfi"''-" '^^- '^""^-^^''^ ^^afts smooth and blender; To^ules 

 iTr rA K- ^^'^^ ^''''^\' ^^'^"^ved. acuminate hooks. In cdd 

 water, Berkshire County, Mass., and Nova Scotia. 



u ^^^" ^^^- u Spicules of Ephydatia everetti. Four tynes of snirnlp.; f,cn,r.A 

 formed of hooked rays; minute dermal birotulates. X 100 (After Potts ) 



35) Dermal spicules stellate Dosilia Grv^y. 



Only species yet reported m the United States. 



Dosilia palmer i (Potts) 1885. 

 Sponge massive, subspherical, lobate. Skeleton spicules spar«;elv 

 microspined, curved, gradually pointed. Dermal spicules star- 

 shaped, consisting of a variable number of arms of various lengths 

 radiating froni a large smooth globular body; arms spined through- 

 out. Gemmule birotulates with long spined shafts, rotules notched 

 i^rom Colorado River, 60 miles below Fort Yuma, attached to 

 pendent branches flooded bv spring freshets. •iii'icnea to 



In the opinion of Annandale, Potts' var. pdmeri is a different 

 species from Carter s /^/wm^^o from India. He has seen types of 

 both and is confident both belong to DosUia 



Spicules oi Dosilia palmeri. Five types of spicules figured 



lule 



rotules of same, irregularly notched; substellate dermal spicules; imperfect 

 Xi^ (ASerPottsT ^'''° '''^'' amorphous " Scotch terrier ' forms. 



37 (15) Gemmule birotulates of two distinct classes t^^ 



38(41) Dermal spicules stellate Aster omeycn ia Xnus^udviXc. . 39 



thf?o?m of^antSerl!"''^'''^^^ ^^"'"'"'' 'P^'"'"' ^^ '^° ^^'''"'^ ^^^^ ^°^ ^'^^ microsderesin 



