I 



102 THE AMEKICAN MONTHLY [June, 



6. Pectinatella. 



1. Colonies \ inch to a foot or more in diameter ; tentacles 50 to 80 ; stom- 

 ach yellowish -brown, longitudinally plicate. P. 7nagnifica^ Leidy. Figs. 



2. Colonies and animal unknown ; statoblast oval, with 14 spines on each 

 end, their free extremities barbed with several recurved hooks. Habitat, 

 ponds near Bombay. P. Carteri., Hyatt. 



7. Cristatella. 



I. Colony oval, convex above, flat beneath, yellowish-brown, 3 inches 

 long, ^ inch wide ; most motile when young ; cells forming 3 concentric 

 rows, on the upper surface ; tentacles 30 to So ; polyp yellowish-brown ; in- 

 testine pale blue-green ; contractile disk inferior, oval, very changeable in 

 shape. C. mucedo^ Cuvier. 



3. Colony oval, flattened, yellowish- white or amber, transparent, i to 3 

 inches long, \ inch wide ; traveling about one inch a day ; cells in 3 rows ; 

 tentacles 63 to 73. C. IdcB^ Leidy. 



3. Colony rounded when young, ribbon-like when old, 5 to 6 inches long, 

 \ inch wide, \ inch thick ; a colony one inch long travels its own length in 

 one day ; cells in from 4 to 8 concentric rows ; tentacles about 90. C. ophid- 

 ioidea, Hyatt. Fig. 15, reduced in size. 



4. Colony vermiform, very slightly adherent, about 6 inches long, more 

 or less sinuous or spiral ; cells slightly projecting, scattered ; tentacles 53 to 

 60, longer than the body. C. lacustris^ Potts. 



8 . Palu dicella . 



I. Cells clavate, end to end; tentacles 16; colonies linear, brown, pros- 

 trate, and bearing numerous erect branches disposed in little clusters. P. 

 Ehretibergii^ Van Beneden. Fig. 16. 



3. Cells irregularly disposed, more or less united together, the orifices 

 terminating long, free tubes, exceeding J^ inch ; colonies prostrate, the ori- 

 fices making them bristly, like a chestnut-burr ; tentacles 19 to 3i . P. erecta, 

 Potts. 



9. Norodotiia. 



I. Cells cordate, short, thick, slightly pedunculate, largest at base; orifice 

 subquadrangular ; lateral walls thick and continuous about the circumfer- 

 ence ; central area thin, smooth ; colonies dark brown, branching; the dried 

 central area glistening like the trail of a slug ; cells about 3'^ inch long. 

 Habitat, Siam. N. Cambodgiefisis. Jullien. Figs. 17, 18. 



3. Cells elongate-cordate, flattened, centrally enlarged, pedunculate, the 

 extremities tapering, especiallv the anterior : orifice rounded or oblong ; 

 lateral and posterior walls thick, the anterior thin ; central area thin, a taper- 

 ing elevation extending posteriorly from the orifice ; colonies pale, branch- 

 ing ; cells about ^-^ inch long. Habitat, China. N. Sinensis^ Jullien. 

 Figs. 19, 30. 



10. Hi si op la. 



Cells irregularly oval, prostrate, flattened, anteriorly thin and transparent ; 

 lateral walls thick, with 3 to 4 stoloniferous orifices ; colonies sometimes 

 linear, oftener indefinite ; orifices subquadrangular, a spine at each angle ; 

 tentacles 16 (.^). Habitat, central Lidia. H. hicustrls., Carter. Fig. 31. 



Trenton, New Jersey, 



