CHAP. IV.] THE CRUISES OF THE 'porcupine: 181 



Oeryon tridens, is a fine Norwegian species. With 

 these are associated two forms of a more southern 

 character, Inachus dorsettensis and lEbalia cranchii, 

 which I should not have expected at so great a 

 depth." The echinoderms were a very northern 

 group. They included Gidaris papillatd, Echinus nor- 

 vegicus and M microstoma, the young of Brissopsis 

 lyrifera, Astropecten arcticus, Ar chaster andromeda, 

 and A. parellii, with a small specimen of Ophio- 

 musimn lymani, several examples of Ophiacantha 

 spinulosa, and as usual one or two of the universally 

 distributed Echinocucumis typica. Dr. Mcintosh, to 

 whom the annelids were referred, notices as a species 

 supposed to be specially northern, Thelepus coro- 

 natus, Fab.; and Holtenia carpenteri, our familiar 

 anchoring sponge, of all sizes and ages and in consider- 

 able numbers, was entangled in the hempen ' swabs.' 

 July 9th. — ^The wind still too light for effective 

 work. Dredged in 717 and 358 fathoms, the assem- 

 blage of mollusca having the usual character of being 

 to a great extent common to the recent fauna of the 

 seas of Norway and to the pliocene fauna of Sicily 

 and the Mediterranean. It included on this occasion. 

 Terebratella spitzbergensis, an arctic and Japanese 

 form, Pecten vitreus, and P. aratus, Leda pernula, 

 Trochus suturalis, Odostomia nitens, and Pleurotoma 

 hispidulum. Among the echinoderms was a fine 

 specimen of Brisinga endecacnemos, Absjobnsen, 

 very markedly different from B. coronata, which was 

 the form commonly met with in the north. The 

 corals were represented by Amphihelia oculata and 

 BesmophyUum crista-galli. Among the annelids were 

 Bista cristata, O. F. Muller, and Trophonia glauca. 



