MARSHALL : ADDITIONS TO " BRITISH CONCHOLOGY.'* 89 



H. ulvse Penn. is one of the shuttlecocks of conchology, no end 

 of varieties, species, and even genera having been manufactured from 

 the type and its var. minor. 



var. minor Marsh. — Gwyn Jeffreys writes that " Turbo minutus 

 of Totten, which inhabits similar situations [to our var. minor'] on the 

 western coasts of North America, and which I found plentifully on 

 the sea-board of Canada and New England, appears to be a different 

 species."^ 



H. ventrosa Mont. — The record of this species from Sanda 

 Island, Clyde, in 19 fathoms, given in the Scottish Fishery Board 

 Report for 189S, is very doubtful, even if attributable to a solitary 

 specimen possibly washed out to sea. It is far more likely to be 

 H. iilvce, and not improbably of the var. barieei. 



Retrotortina fuscata Chast.^ — A specimen of a minute shell 

 described under this name was dredged in the Royal Irish Academy 

 Cruise of 1886 at Lough Hyne in the south-west of Ireland. 



Homalogyra rota F. and H. — Forbes and Hanley mention, as 

 does Jeffreys, the carinations on this shell, but neither author exhibits 

 them in the figures. 



var. tricarinata Webster.— On a new British species of Skenea, 

 Ann. Mag. N. Hist., vol. xviii., p. 156, pi. viii., fig. 12, 13 ; and vol. 

 xix., p. 269 = H. rota \2ix. fischeriana Monterosato, Journ. Conchyl., 

 1869, p. 274, pi. 13, fig. I.— -This variety was originally found by Mr. 

 Webster "among Coralliiia officinalis at Gwyllyn Vase, Falmouth." 

 A search among my Homalogyra, taken from the same habitat many 

 years ago, resulted in two more specimens being brought to light. I 

 have it also from Jersey, Guernsey, Connemara, and Sligo, and a 

 specimen was dredged in Lough Hyne, S.W. Ireland, during the 

 R.I. A. cruise. It differs from the type in the ring-like sculpture being 

 absent. Mr. Webster's figures, unfortunately, are of little use as a 

 guide, Gwyn Jeffreys merely cites the name,^ apparently not deem- 

 ing it worthy to rank as a variety ; but I think it deserves equal 

 recognition with H. atomus V2cc. polyzona Brus., which is analogous. 



Caecum glabrum Mont. — The extra-British distribution of this 

 species requires confirmation, as it has been mixed up both with 

 C. lavissimum Cant, and C. snbannulahim De Folin. The latter 

 differs from C. glabriwi in having sUght and shallow ringed sculpture, 

 while C. Iczvissimum is several times larger. 



(To be continued). 



1 Proc. Zool. Soc, 1884, part vii. , p. 128. 



2 Journ. Malac, 1906, vol. v., p. 2, pi. i., figs. 5 — 6 ; Proc. Irish. Acad., 1898, vol. v. 



3 Brit. Couch., vol. iv., p. 73. 



