170 VICTORIA MEMORIAL MUSEUM. BULLETIN NO. 



Halecium tenellum Nutting, Hydroids of Woods Hole, 1901, 

 p. 357. 



Common on ascidian stems in 50 fathoms of the Can so Banks. 



Lafceid^. 



Genus Cryptolaeia. 



Cryptolaria triserialis new species. 



Plate XIII, figs. 1 and 2. 



Trophosome. Stem fascicled, very coarse. No complete 

 colony was obtained. The largest fragment was 4 cm. long 

 and 0-8 mm. in diameter. There were several large branches 

 given off from the main stem. On the stem the hydrothecae are 

 not numerous; they appear singly or in opposite or sub-opposite 

 pairs, each with about the distal half free. On the branches, 

 where they are free from fasciculation, the hydrothecae are 

 nearer together, arranged in three series, two making such a 

 wide angle with each other that they are not far from being 

 in the same plane, and the other intermediate between them 

 on the larger side. The hydrothecae of the first two series 

 appear in pairs, those of the other alternate with these pairs. 

 They are large, from 1-5 to 2 mm. in length and 0-35 mm. in 

 diameter. The proximal half is in contact with the branch, 

 the distal half curves regularly outward. 



Gonosome. Unknown. 



Distribution. Dredged in 20 fathoms off Durell island, 

 Chedabucto bay, Canso. 



In some respects this species resembles Cryptolaria borealis 

 Levinsen 1 . His description is rather meagre, but as his colonies 

 were only from 4-5 to 20 mm. long, the species must be a 

 much smaller one than that herein described. On the non- 

 fascicled branches, the hydrothecae are arranged in four series, 

 giving a cruciform arrangement, while in this species there are 

 but three series. These differences alone seem sufficient to 

 indicate that the Canso specimens are of a different species 

 to those found in Davis strait. 



^eduser, Ctenophorer og Hydroider fra Grcenlands Veatkyst, 1893, p. 31. 



