HYDRO ins EASTERX C AX AD A 347 



SESSIONAL PAPER No. 38a 



The tenuity of the hydrothecal walls may vary much in the same species and the 

 collapsible appearance is often due to the length of time the hydroids are in stale water 

 before they are examined or before they are preserved. 



Finally as to the number of teeth in the margin of the hydrothecfe, the number 

 may vary from 12 to 16 in the hydrothecfe of the same colony and they appear to be 

 just as liable to be numerous in the small hydrothecse as in the large ones. 



While the chasm is a great one between the small specimens and the very large 

 ones, when only those are seen, it becomes entirely bridged when all graduations are 

 brought into view also. The conclusion that all specimens recorded as C. hicophora, 

 C. grayi and C. johnstoni should be all included in the one species C. johnstoni 

 (Alder) to me seems unavoidable. 



Clytia NOLiFoions (McCrady). 

 Campanularia noUformis McCradv, Gymno. Charleston har., 1S57, p. 92. 

 Clytia noUformis ISTutting. Hyd. Woods Hole, 1901, p. 343. 

 Fraser, Hyd. Beaufort, 1912, p. 359. 

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

 ISTuTTiNG, Am. Hyd., iii, 1915, p. 57. 

 Distribution. — Canso, Gaspe, Seven islands (Stafford); Briar island, 33 to 39 

 fathoms, on sargassuni in Gulf Stream, east of Xova Scotia. 



Genus EUCOPELLA. 

 Eucofella CALicuLATA (Hincks). 



Campamdaria caliculafa HixcKS, Ann. and Mag. IN'at. Hist., 1S53, p. 178. 



Clytia (Orthopyxis) poicvium Agassiz. Cont. Nat. Hist. U. S., 1862, p. 297. 



Orthopyxis poterinm A. Agassiz, N. A. Acalephse, 1865, p. 223. 



Orthopyxis calicidata Yerrill, Mar. Invert. Vineyard sound, 1873, p. 408. 



Campamdaria poterinm Nutting, Hyd. Woods Hole, 1901, p. 344. 



Campanularia caliculata Hargitt, Am. Nat., 1901, p. 383. 



W^HITEAVES, Mar. Invert. Eastern Canada, 1901, p. 23. 

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



Eucopella calicidata Eraser, Hyd. Nova Scotia, 1913, p. 166. 

 Eraser, Hyd. Y. I. region, 1914, p. 147. 



Orthopyxis caliculata Bale, Proc. Roy. Soc. Yiet., 1914, p. 72. 

 Nutting, Am. Hyd., iii, 1915, p. 64. 



Distribution. — Bay of Fundy, low water to 30 fathoms, gulf of St. Lawrence at 

 the Mingan islands, 6 fathoms (Yerrill) ; Henley harbour, strait of Belle Isle, 20 to 

 30 fathoms (Packard) ; Seven islands (Stafford) ; Canso, 20 fathoms (Eraser) ; Sea 

 Coal bay, N.S. (A. Agassiz). 



In my previous papers where this species was recorded the name Eucopella cali- 

 culata has been used but now Bale and Nutting intimate that Eucopella must be dis- 

 carded for Orthopyxis. It seems to be putting a big stretch on the law of priority 

 when it is made to cover a name that was first applied to a subgenus and later a genus 

 but admittedly never defined. ]t is all very well to speak of the " elaborate descrip- 

 tion " given by Agassiz for Clytia (Orthopyxis) poterium, but it was not sufficiently 

 elaborate to give recognition to the fact that the species had already been described. 

 In any case the description was not complete enough to convince Hincks of the neces- 

 sity for the new genus for, while recognizing the identity of Clytia poterium with his 

 own Campamdaria caliculata in his 1868 work, he retains the name Campanularia. 



Little stress can be laid on the fact that A. Agassiz used the name Orthopyxis 

 in 1865 as there he simply refers to his father's collections without farther remarks. 



