450 ON THE FAUNA AND BOTTOM-DEPOSITS NEAR THE 30-FM. LINE 



Depth. To 42 fathoms (HartkuL). 



Habitat. On other zoophytes and sea-weeds, very common (Hincks). 



Calycella fastiijiata. This was recognised in haul 75 (Ground VII.). 

 DiSTKiBUTiox. Scotland, Cornwall (Norman, No. 90 ; Hincks, No. 46), North Sea 

 (Schulze, No. 105). Growing on other hydroids. To 81 fathoms (Porc!<pr/ie, AUman, No. 4). 



Cuspidella costata. liecognised in haul 81 on the fine sand ground (I.). 

 Distribution. Whitby, Yorkshire. On Syncoryne eximia (Hincks). 



Trichydra pudica. This species was found by Mr. Browne growing 

 on Hakcium halecinum and on a Pcdcn opcrcularis shell in haul 97 

 (Ground XV., fine gravel). 



Distribution. Found by Wright in the Firth of Forth, on a small shell. There are 

 no other records (Hincks, No. 46). 



Coppinia arda (Table VI.). Abundant on the fine sand grounds, 

 especially on Lafoca dumosa (var. robusta) and on Sertularia abietina. 

 Whenever special attention has been paid to the point, I have always 

 found the creeping variety of Lafoca dumosa growing on the branch 

 of Scrtidaria abietina upon which the Cop^rwitft was found. As the 

 gonothecse of Lafoea dumosa are quite unknown, the constant associa- 

 tion of Cop)p>inia arda with it naturally suggests the idea that the 

 latter might be the reproductive stage of Lafoea.''^ 



Distribution. Geogrcqjliical. Circumpolar (Norman), Norway, British Seas, Pas-de- 

 Calais (fide Hartlaub, No. 38). 



Depth. To 50 fathoms (Schulze). 



Habitat. Growing on Scrtidaria abietina and on Hydrallmania falcata (Hincks). 

 Hartlaub also found it on these two hydroids, generally associated with Filellum serpens. 

 Schulze (Pommerania, No. 105) records it on Hydrallmania falcata. 



Hakcium halecinum (Chart II.). The distribution of this hydroid 

 is both interesting and significant. The species is very abundant on 

 the grounds to the westward of the Eddystone, but is scarce or entirely 

 absent on the remaining grounds. The abundance of Hakcium is 

 specially characteristic on the mixed coarse gravel and fine sand of 

 Grounds IX. and XI., on the finer gravel of Ground XIV., and on 

 the coarse sand of Ground VII. As will be seen from the chart, the 

 species extends from these grounds on to those which immediately 

 surround them, in what appears to be diminishing quantity according 

 to the distance from the centre of abundance. Thus on the fine sand 

 of Ground VI. it is fairly abundant, on the coarse sand of Ground IV. 

 it is still met with in some quantity, on the fine sand of Ground III. it 

 is scarce, whilst on the fine sand of Ground I. it is represented by 

 two colonies only, one in liaul 92 and one in haul 82. On the fine 

 gravel of Ground XII., again, the species is present, but in much 



* Since the above wa.s in type C. C. Nutting's paper on "Hydroids from Alaska and 

 Puget Sound" (Proceed. U.S. Nat. Museum, vol. xxi.) has come to hand, in which it is 

 maintained that Cojrpinia arcta is in reality the gonosome of Lafoea, a view which appears 

 to have been definitely held ])y Levin.sen in 1893. [Meduser, Ctenophorer, og Hydroider 

 fra Gi-'6nlands Vcstkyst, Copenhagen, 1893.) 



