136 JOURNAL OF CONCHOLOGY, AOL. 9, NO. 5, JANUARY, 1899. 



R. cingillus Mont. — "Atlantic and N. Atlantic. Recorded from 

 the Mediterranean by various writers, but the locality has not been 

 verified, and is probably erroneous ; Gibraltar is the only part of the 

 Mediterranean well ascertained." 1 A specimen from Guernsey has 

 convex whorls. 



R. pella L. would have a prior claim to R. cingillus Mont, if there 

 were not a doubt as to its Icelandic origin, whence it was first 

 recorded by one of Linne's pupils. Adams' Turbo trifasciatus has the 

 next prior claim, but has not hitherto been used by writers for some 

 reason. 



I have a fine and fresh but dead specimen of R. cimex from the 

 Kyles of Bute, 18 f. It may have come in ballast from the Mediter- 

 ranean, where it is not uncommon. It comes next to R. cancellata, 

 and differs from that shell in being larger, oval, and more solid, with 

 finer sculpture, a shallower suture, and more expanded aperture. It 

 has previously been recorded from the Isle of Jura by Laskey, and 

 from Cumbrae by Mr. J. Smith. 



Hydrobia Hartm. — Mr. Edgar Smith 2 advocates the substitution 

 of Paludestrina D'Orb. for Hydrobia, on the ground of the latter 

 being occupied for the Coleoptera (Hydrobius) ; but although this 

 has long been known, it does not seem to have commended itself 

 to writers. 



H. ulvae Penn. ■ — Jeffreys has not described this species with 

 his usual clearness. In the first place, the shell cannot by any 

 means be called "oblong;" it is a lengthened cone, as his figure shows, 

 though usually a little more conical still. Neither is it " more or less 

 distinctly keeled " ; plenty of specimens have no keel. Sowerby's figs. 

 3 and 3* (pi. xiii.) are the more prevalent forms ; Jeffreys' is too 

 slender, elongated, and compressed. Nor can the umbilicus properly 

 be called such ; it is at most a small chink, often covered by the inner 

 lip ; in convex specimens, however, it is more noticeable. The type 

 figures in " British Mollusca " are perfect, and have no trace of an 

 umbilicus, but two figures of varieties have a chink. Besides inhabit- 

 ing " our tidal rivers, inlets, and bays," Jeffreys has added in the 

 'Lightning' Report, "everywhere between tide-marks." 



It is not easy to say what was Montagu's var. sabumbilicata. Col- 

 lectors have come to consider it as smaller, with more convex whorls 

 and a decided umbilical chink, such as Sowerby's fig. 3 (pi. xiii.). 

 Forbes and Hanley say his description is " inadequate," while Jeffreys 

 says it is probably the male, and that their shells have no keel. It 

 cannot be the male form, as small and large specimens are not found 



1 Monterosato, Nomenclatura, p. 67. 



2 /. Conch., vol. 6, p. 336, 1S91. 



