336 Proceedings of Royal Society of Edinburgh. [sess. 
Ophiocten sericeum , Lj. 
Dytaster exilis , Sladen. 
Antedon abyssicola , P. H. C. 
Drepanophorus serraticollis, Hubrecht. 
Pelagonemertes Rollestoni, Moseley. 
Artacama proboscidea, Malmgren. 
Eunice Oerstedi, Stimps. 
Eupista Danvini , M‘Int. 
Scalpellum velutinum , Hoek. 
Typldotanais herguelenensis , F. E. B. 
Neotanais americanus , F. E. B. 
Gnathophausia gig as, W. S. 
Munidopsis subsquamosa , Hend. 
Mytilus edulis, (L.). 
Odostomia rissoides , Hanley. 
Natica groenlandica, Beck. 
Doris tuberculata , Cuv. 
Pustulipora delicatula , Busk. 
„ deflexa , Smit. 
Membranipora crassimarginata , Hincks. 
Crisia eburnea, (L.). 
Pyrosoma spinosum, Herdman. 
Of the remaining forms quoted as common to far southern as 
well as to northern latitudes, there are a very considerable number 
in regard to which I for my part have no right to question their 
identification, yet they seem to me to fall into a category of 
evidence comparatively valueless in support of a theory, by reason 
of their minute size, the paucity of specimens examined, the 
similarity of allied forms, or from the circumstance that their 
characters are drawn from hard parts alone, in most instances 
from a shell, with no reference to the animal within. It must 
be manifest that while such records swell the lists of apparently 
discontinuous distribution, yet that a multitude of them would 
not carry the same conviction as one well-marked and un- 
mistakable Decapod or Ceplialopod or Fish. In this category I 
should be inclined to place about five and twenty other 
species cited by Murray, including the eight species of Ostracods, 
