328 L. R. CRAWSHAY. 



The species has not hitherto been recorded in the Plymouth fauna. 



Distribution: Northumberland; South Devon; Filey, Yorks; Peter- 

 head; "Wick; Hebrides; Shetland (cp. Hincks, 55); Isle of Man 

 (G. Wood, 64); Cuba; California; Eio de Janeiro (cp. Nutting, 60); 

 Davis Strait ; Smith Sound ; Jones Sound ; Jan Mayen ; Spitzbergen ; 

 also in Sub-Antarctic Seas (cp. Broch, 50). 



Diphasia attenuata (Hincks). 



At Positions 14, 35, 49, 53, 56, 59, 60, 62, vii, 80. 



Depth, 43-51 fath. or over. 



Chiefly on Cellaria ; occasionally on other Hydroids ; at one position 

 on a Pallasia tube. Several colonies at most of the positions enume- 

 rated. Especially well-grown colonies occurred at Position 62 with 

 a few male gonangia, and at Position 80, with numerous female 

 gonangia, respectively. 



Diphasia pinaster (Ellis and Solander). 



At Positions 1, 3, 6, 8, 10, 12, 13, 14, 51, 60, 80. 



Depth, 40-51 fath. 



A large colony occurred at Position 8. In other cases the specimens 

 were of rather small size or quite young colonies. 



Diphasia pinnata (Pallas), 



One or two specimens at Positions 14, 35 (dead), 43 (fragment), 60, 



62, vii, 80. 

 Depth, 43-51 fath. or over. 

 Female gonangia were borne on colonies from 14, 60, and 62. 



Diphasia alata, Hincks. 



Only obtained at Position 80, where a well-grown colony occurred. 



Depth, 51 fath. 



It is doubtful whether this species occurs in the Plymouth fauna. 

 There is one specimen in the Laboratory without data, and a second — 

 a good-sized colony, separated from its attachment — which was dredged 

 up on the Mewstone Ledge in June, 1908. It is not certain that the 

 latter specimen may not have found its way there through the medium 

 of trawlers from outside, but in view of the fact that the natural habitat 

 of the species is on the rough ground in the deeper water of tlie Channel, 

 and far outside the ordinary trawling grounds, it seems more probable 

 that the specimen grew where it was obtained. In the course of a 

 cruise made by the Oithona in 1910, the species was found growing 

 luxuriantly in the deeper water between the 50-fathom and 60-fathom 

 lines — that is to say, immediately outside the limits of the cruises dealt 



