UYDROIDR EASTERN CANADA 351 



SESSIONAL PAPER No. 38a 



Genus CUSPIDELLA. 



CUSPIDELT.A COSTATA Hincks. 



Cuspidella costata Hincks, Br. Hyd. Zooph., 1868, p. 210. 



Stafford, Fauna Atlantic Coast, 1912, p. 73. 

 Distribution. — Gaspe (Stafford). 



Cuspidella graxdis Hincks. 



, Cuspidella grandis Hincks, Br. Hyd. Zooph., 1868, p. 210. 



Whiteaves, Mar. Invert. East. Can., 1901, p. 24. 

 Distrihution. — Orphan bank (Whiteaves) ; Coteau harbour. Long island, Labia- 

 dor (Packard). 



Genus OPERCULARELLA. 

 Opercularella lacerata (Johnston). 

 Campanularia lacerata Johnston, Br. Zooph., 1847, p. 120. 

 Opercularella lacerata Hincks, Br. Hyd. Zooph., 1868, p. 194. 



Nutting, Hyd. Woods Hole, 1901, p. 354. 

 Stafford, Fauna Atlantic Coast, 1912, p. 73. 

 Fraser, Hyd. Nova Scotia, 1913, p. 168. 

 Distrihution. — St. Andrews (Stafford) ; Fox island, Chedabucto bay, low tide 

 (Fraser) ; Niger reef, weir stakes, St. Andrews island, Brier island, 33 to 39 fathoms. 



Opercularella pumila Clark. 



Opercularella pumila Clark, New England Hydroids. 1876, p. 61. 



nana Hartlaub, Die Hydromedusen Helgolands, 1897, p. 502. 

 pumilla Hargitt, Hyd. Woods Hole, 1909, p. 375. 

 Distrihution. — Weir stakes, St. Andrews island. 



The description and figures given by Hartlaub for Opercularella nana agree per- 

 fectly with the creeping form of Opercidarella pumila as described by Clark. Clark 

 found but empty gonangia but Hartlaub found and described the complete gonosome. 

 There is no question but that the species is distinct from 0. lacerata (Johnston). In 

 the specimens fovmd in the Bay of Fundy, the hydrothecse are only about half as long 

 (•25) in 0. pumila as they are in 0. lacerata (-45 mm) and the gonangia are of 

 an entirely different shape. In 0. lacerata they are rounded or truncate at the distal 

 end, while in 0. pumila the distal portion is drawn out to become much more tubular. 

 All of the material obtained at St. Andrews I. was of the creeping type but it was 

 well supplied with gonangia. 



Genus STEGOPOMA. 

 STEG0P0]\rA PLiCATii.E (Sars). 

 Lafcea plicatile Sars, Forhandl., 1863, p. 31, 



Stegopoma plicatile Levinsen, Medusae, Ctenophorer, etc., 1893, p. 36. 

 Broch, Coelenteres du Fond. 1912, p. 11. 

 Fraser, Hyd. V. I. region, 1914, p. 161. 

 Distribution. — Bay of Islands, Newfoundland. 



Genus TETRAPOMA. 



Tetrapoma quadridentatum (Hincks). 



Calycdla quadridentata Hincks, Aim. and Mag. Nat. Hist., 1874, p. 149. 

 Tetrapoma quadridentatum Levinsen, Medusar, Ctenophorer, etc., 1893, p. 180. 

 Calycella quadridentata Stafford, Fauna Atlantic Coast, 1912, p. 73. 

 Distrihution. — Gaspe (Stafford). 



