432 REPORT— 1867. 



the latter are recent or surviving and which fossU or relics of the glacial epoch. 

 The two Brachiopods ra question must, I think, stand or fall together as 

 British. Mr. Davidson (the great authority on this abnormal class of the 

 MoUusca) says that, under the circumstances I have mentioned, " there 

 appears to be a probability that these two species may occur somewhere 

 in the neighboiu'hood — if not quaternary ; but if this last, I hardly think 

 they would have been so perfect and fresh as you describe them to be." 

 Professor Loven, who has examined my specimens, considers them recent. 

 According to Professor Sars, R. 2^sittacea inhabits the coast of Pinmark, as far 

 south as Tromso (69° 40' N. lat.), at depths of from 20 to 80 fathoms. Mr. 

 M' Andrew dredged it off Drontheim and in Upper Norway, at depths of from 

 40 to 150 fathoms. Drontheim lies in 63° N. lat., Unst in about 61°. 



Lecla pernula, MiiUer. 



A valve, apparently fossil, was dredged on the northern coast ; and several 

 valves in a fresh state (partly covered with a glossy epidermis) and a small 

 perfect but dead specimen were dredged m St. Magnus Bay, on the west coast, 

 at a depth of from 60 to 80 fathoms. As no glacial fossils of arctic species 

 occurred on the west coast, I have no hesitation in regarding L. pernula as 

 British. I had in former expeditions dredged small valves and a complete pair 

 east of Shetland and in the Hebrides. This species inhabits the Scandinavian 

 coasts, as far south as Kullen in Sweden, from 20 to 150 fathoms; and 

 M'Andrew records a depth of 160 fathoms : it is a circumpolar species, and 

 also one of our post-tertiary or quaternary fossils. 



The next two si^ecies are especially interesting, in respect both of novelty 

 and of the classification of the MoUusca. They belong to the class Solenoconchia 

 (Solenoconches, Lacaze-Duthiers, or Scaphopoda, Bronn), which is represented 

 by the genus Dentalium. I have elsewhere so fully treated of this peculiar class 

 that I will now offer merely a few remarks on the genus Siplionodentalium of 

 Sars, to which or an allied genus the species now about to be noticed must be re- 

 ferred. Sipho^wdentalhim (perhaps the tji^e of a separate family of Solenocon- 

 chia) is distinguished from Dentalium by having an extensile worm-like foot, 

 the disk of which expands in the shape of a flower and is furnished with a spike, 

 by the mouth or anterior orifice of the shell being obliquely truncated — in Den- 

 talium it is circular, — and by the posterior or smaller orifice having its mar- 

 gin serrated or slit on each side, instead of this orifice being furnished with 

 a short pipe or having its margin slit on one side only. I am inclined to refer 

 one of the species now discovered as British to the genus SipJwnodentalium, 

 and the other to the genus Cadidus of Professor Philippi*. In the latter 

 genus (which Philippi proposed for the reception of a small Sicilian fossil — his 

 Denialiimi ovidum) the shell is not cylindro-couical as in Siphonodentalium, 

 but is tumid in the middle or anterior portion, sometimes awl-shaped ; and 

 the mouth is encircled by a narrow rim. In Cadidus the shell is qiiite 

 smooth, transparent, and lustrous ; in Siphonodentalixmi it is striated or exhi- 

 bits the lines of growth, and is semitrausparcnt. The long-lost Dentalium 

 f/adus of Montagu, an allied species (D. davatum of Gould) from the China 

 Sea, another species which 1 observed in the late Mr. Cuming's collection, from 

 Mindanao (erroneously named Z>. acuminatum, Deshayes), and D. coarctatum of 

 Lamarck (a tertiary fossil) apparently belong to Cadulus, and certainly not to 

 Ditrupa (properly Ditrypa), a genus of testaceous Annelids the shell of 

 which is different in structiu'e and composition from that of Cadulus or of 



^' Moll. Sic. ii. p. 209. 



