258 FRESH-WATER BIOLOGY 



120(121) No lorica, with or without a stalk Monosiga TLent. 



Representative species Monosiga ovata Kent 1880. 



Body obovate, the broader end posterior; with a rigid pedicel nearly 

 equal to the body in length. Length of body about 6 it. Reported by 

 Conn from the fresh waters of Connecticut. 



Fig. 417. Monosiga ovata. X 1000. (After Conn.) 



121 (120) With lorica, with or without a stalk. . . Salpingoeca James-Clark. 

 Representative species . . . . Salpingoeca convallaria Stein i8yS 



Lorica campanulate, pointed posteriorly, slightly constricted anteriorly. 

 Pedicel very slender and short. Zooid nearly filling the lorica. Length of 

 lorica 15 to 25 m- Attached to Epistylis. 



Fig. 418. Salpingoeca convallaria. X 600. (Alter Kent.) 



122 (119) Forming colonies 123 



123 (128) Without stalks. . . 124 



124(127) Colonies enclosed in a gelatinous mass 125 



125 (126) Forming a flat colony in an irregular jelly. . Proterospongia Kent. 



Representative species. . Proterospongia haeckeli Kent 1880. 



Zooids pyriform, plastic; collar long, each zooid bearing a single flagel- 

 lum. Colony may contain as many as fifty or sixty zooids, but often not 

 more than six or eight. The gelatinous support very transparent. 

 Length of zooid 8 11. Fresh water. 



Fig. 419. Proterospongia kaeckeli. X 375. 



126 (125) Colony disk-shaped or arising from a funnel-like, open jelly tube. 



Phalanslerium Cienkowsky. 

 Representative species. . Phalanslerium digitatum Stein 1878. 



Zooids ovate, plastic. Flagellum two or three 

 times the length of the body. Jelly mass coarse, 

 granular, digitiform, and often branching. Length 

 of zooid 18 ^. Fresh water. 



Fig. 420. Pkalansterium digitatum. X 400. (After 

 ButschU.) 



