306 MAZATLAN UNIVALVES 
tion of the shells to rocks and stones, near low water mark 
of neap tides, not uncommon; C. B. Adams. 
Comp. Vermetus Panamensis, “-Rouss. in Chénu, Ill. Conch. 
pl. 5, f.1.°—Mke. in Zeit. f. Mal. 1850, p. 165, no. 13.— 
C. B. Ad. Pan. Shells, p. 216. no. 324. Hab.—Mazatlan ; 
in mass of coral, on Spondylus ; Menke—Panama; in the 
same situations as V. glomeratus, attached on one side of all 
the whirls; C. B. Adams. 
This species may possibly be the V. glomeratus of Mike. and 
C. B. Ad.: but as it is not the S. glomerata of Lina. (v. Hani. 
Ips. Linn. Conch. p. 444,) nor the V. glomeratus of PAil., which 
has a peculiar habit of growth, it does not seem fair to adopt 
the name figured only in Chenu, especially as that appears a 
third species, judging by the size and colour.*—The shell may 
again prove to be the V. Panamensis of the same authors ; but 
the figures cited do not appear with that name, but with that 
of V.lumbricalis. Zem. There can scarcely be a doubt that 
they represent the species of Adanson ‘Le Vermet”: as to 
whether that be the real V. lumbricalis of Zam., v. Desh. An. s. 
Vert. vol. ix: p. 66, no. 1. Whether this again be the S. lum- 
bricalis of Linn., v. Hanl. Ips. Linn. Conch. p. 445. 
The shell is much more uniform in diameter and more parallel 
in spire-margins than A. centiquadrus, jun. which it resembles 
in sculpture, and mode of attachment. The colour is however 
generally with more of a pink and less of a brown tinge. The 
nuclear whirls resemble Rissoa. It is known externally from 
Petaloconchus macrophragma, which it resembles in mode of 
growth, by its much ligher colour, without purple tinge. An 
extremely fine specimen, from the Gulf of California, is in 
Mr. Cuming’s collection. A closely related, if not identical 
species is found in the W. Indies. Long. °9, lat. apert. *14. 
Hab.—Mazatlan ; not uncommon, on Spondylus, Gadinia, and 
other shells ; Z’pool Col. : 
Tablet 1489 contains 4 sp. very young.—1490, 1 sp. on frag- 
ment of Pinna, and several young on Gadinia pentegonio- 
* Or C. B. Adams’ V. glomeratus may be the Aletes centiquadrus, which is 
eited under query in the Pan. Shells asa synonym. A different species from 
either, though intermediate in character, was brought from Panama by Mr. 
Bridges, and may be the V. Panamensis. ? Has Prof. Adams in this genus alone 
taken his synonyms on trust, and copied the species of Menke’s Catalogue. This 
‘at least will explain the confusion. Mr. Bridges’ shell was at first believed by 
Mr. Cuming and myself to be a Petaloconchus, in consequence of the edges of a 
minute Isognomon appearing inside a broken section. After opening several parts 
in hopes of observing the structure, the bivalve fell out, and the Vermetid sub- 
sided into Biyonia, 
