90 THE CANADIAN NATURALIST. [Vol. vii. 



beautiful polariscope objects. Another species, which I at first 

 thought referable to Bowerbanks genus Polymastia, occurred fre- 

 quently in deep water. Since my paper in the 'Annals ' was written, 

 the inspection of a copy of Dr. Wyville Thompson's new volume 

 '^ The Depths of the Sea," and the receipt by the Society of Prof. 

 H. A. Pagenstecher's paper entitled 'ZurkenntnissderSchwamme,' 

 have enabled me to rectify this error. The sponge in question is 

 evidently Thecophora semisiiherites of Dr. 0. Schmidt. The diagno- 

 sis of the genus cited by Prof. Pagenstecher agrees well with St. 

 Lawrence specimens. The character '' Rinde aus homogen ver- 

 •dichteter Sarkode " (outer skin of a thickened and homogeneous 

 sarcode) is a very conspicuous feature in the Canadian sponge, 

 the spicules of which are uniformly spinulate fusiform. A mas- 

 sive IlaUcJwndria, allied to panicea, but differing from it in 

 some respects, was taken in 38 fathoms off Cape Rosier village. 

 The larger spicules are like those of H. panicea, but it has, in 

 ;&ddition to these, numerous small retentive bihamate ones. The 

 remainder of the deep-sea sponges have yet to be identified. 



Hydrozoa. 



The Hydroid polyps collected were tolerably numerous. The 

 following species have been recognized, but only a portion of the 

 series has been carefully examined. 



(Athecata.) 



Coryne pusilla, Gaertner, 

 Tuhularia indivisa, Linn. 



(Thecaphora.) 



Campanularia verticillata, Linn. 

 Lafoea dumosa, FL 



" fruticosa, Sars. 

 Salacia abietina, Sars. 



Sertularella rugosa, Linn. 



" tricuapidata, Alder. 



Sertularia pumila, Linn. 



" fiUcula, Ellis & Sol. 

 " abietina, Linn. 



" argentea, Ellis & Sol. 

 Ilydrallmania falcata, Linn, 

 Thuiaria thuja, Linn. 

 " articulata. Pallas. 



"1 



ACTINOZOA. 



In the lowest order of this class, the Alcyonaria, the most in- 

 teresting discovery was that of a fine series of Pennatuloe. About 

 50 or 60 living specimens were taken in the centre of the river 

 between Anticosti and the south shore of the St. Lawrence, in 

 depths ranging from 160 to 200 fathoms. In the largest speci- 

 mens collected there are 40 pinnules on each side of the upper 

 portion of the coenosarc ; but in average full-grown examples the 

 number is less, and ranges from 30 to 35. On the back of the 

 a^achis there is a central groove, on each side of which are nu- 



