PLATE 37. 



Spicules of Ichthyomenia porosa. X 480. 



Of Chaetoderma montereyensis, small specimen. X 80. 



Of Chaetoderma montereyensis, large specimen. X 80. 



Of Chaetoderma robusta. X 80. 



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



Of Chaetoderma argentea. X 135. 



Of Drepanoraenia vampyrella. X 135. 



Of Chaetoderma attenuata. X 135. 



Of Alexandromenia agassizi. X 335. 



Of Dorymenia acuta. X 135. 



Alexandromenia vahda. X 180. 



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. 



Stropliomenia scandens. X 300. 



Of Chaetoderma nanula. X 135. 



Of Chaetoderma scabra. X 100. 



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



