HTDROID.^ OF EASTERN CANADA 



161 



CalyccUa si/ringa (Linnaeus). 



Trophosomc. Stolon smooth, not reticu- 

 lated; liydi-oteea tubular; margin distinct; 

 operculum of S or 9 converging segments ; 

 pedicel anuulated. 



Gonosome. Gonang'um on the stolon, 

 oval or obovate; "sporosacs extruded into an 

 acrocyst ; jiedicel short, annulated. 



No. 52. 

 Calycella syringa. 



Genus CUSPIDELLA. 



Trophosome. Hydrotheca tubular, sessile on a creeping stolon. 

 Gonosome. Unknown. 



KEY TO SPECIES. 



a Gonangium obvate. 

 h Hydrotheca segmented. 



0. lacerata. 

 C. costaia. 



Cusp'ulella rosldia Ilincks. 



Trophosome. "Hydrothecae somewhat broadly cylindrical, encircled 

 by two or three rather prominent ribs, or lines of growth, dividing them 

 into segments, the uppermost or opercular segment formed of thinner 

 material than the rest and supporting a conical, operculum, composed 

 of very numerous convergent pieces " (Hincks).. 



Gonosome. Unknown. 



No. 53. 

 Cuspid&lla 

 costata (after 

 Hincks). 



Cvspldella grandis Hincks. 



Trophosome. Sessile, tubular hydrothecfe grow from regularly 

 creeping stolon ; operculum of 8-10 segments. 



Gonosome. Unknown. 



Genus Opercularella. 



A 



No. 54. 



grandis. 

 Cuspidella 



Trophosome. Hydrotheca elongate-oval with no distinct margin; opercular seg- 

 ments long and narrow. 



Gonosome. Reproduction by sporosacs that are extruded into an acrocyst. 



KEY TO SPECIES. 



a Gonangium obovate. 

 h Gonangium fusiform. 



0. lacerata. 

 0. pumila. 



79550—11 



