PLATE 37. 



Spicules of Ichthyomcnia porosa. X 4S0. 



(Jf Chaetoderma montereyensis, small specimen. X 80. 



Of Chaetoderma montereyensis, large specimen. X SO. 



Of Chaetoderma robust a. X 80. 



Of Proneomenia hawaiiensis. a X 330; b X 130. 



Of Chaetoderma argentea. X 135. 



Of Drepanomenia vampyrella. X 135. 



Of Chaetoderma attenuata. X 135. 



Of .\lexandromenia agassizi. X 335. 



Of Doryraenia acuta. X 135. 



Ale.xandromcnia valida. X ISO. 



Of Chaetoderma hawaiiensis. X 255. 



Of Lophomenia spiralis. X 335. 



Of Chaetoderma californica. X 135. 



Of Chaetoderma erudita. X 135. 



Of Proneomenia insularis. X 135. 



Strophomenia scandens. X 300. 



Of Chaetoderma nanula. X 135. 



Of Chaetoderma scabra. X 100. 



Of Chaetoderma sp.? Unidentified fragment, Alaska. X 135. 



