MARSTIAT.I, : ADDITIONS TO "BRITISH CONCIIOI.OGV. " I93 



tion of Mr. Duprey/ whose specimens were found in a similar habitat 

 at Jersey, and they are not uncommon in all the islands if properly 

 searched for. The only other locality in which I have taken living 

 specimens is in Torbay, at extreme low water ; but here they are very 

 much eroded and ferruginous, very little of the sculpture remaining. 

 Professor Gwatkin informs me that the radula is Rissoan. 



This is another species in which the type-form has been confused 

 by authors. Montagu's original description indicated six spiral ridges 

 for his type, two of which encircle the umbilicus, one is at the base, 

 two round the periphery, and a sixth encircles the suture of the next 

 whorl. Jeffreys follow's this description, and figures the shell correctly; 

 Searles Wood, in describing the Crag form, notices the four upper 

 ridges, but omits the two lower, though his figures show the six 

 correctly; while Forbes and Hanley, copied by Sowerby, delineate a 

 shell in which one of the ridges round the periphery is absent, as some- 

 times occurs in the var. mternipla., but they give the two typical ridges 

 underneath. The authors of British MoUusca state that "four strong 

 spiral ridges adorn the body-whorl, two above and two below,"' which 

 they make up by omitting one from the periphery, and they do not 

 notice the one which surrounds the suture of the penultimate, though 

 S. Wood distinctly says "our shell has four distinct ridges, three on 

 itpper part of the whorl, and one upon the centre of the base."^ The 

 figures in Sowerby's Index and British MoUusca also err in ignoring 

 the very characteristic aperture of the type, which is correspondingly 

 altered in the var. interrupta by the fewer number of ridges. A. 

 supranitida S. Wood is another member of the genus which varies in 

 having one, two, and sometimes three sharp ridges. 



A. imperspicuus Monts. {Jonrn. Make, vol. 4, pp. 56-7, 1895; 

 andy. Condi., vol. 7, pp. 249-50, 1893, as Cydostrema millepunda- 

 tum).—0^ Southport, 12 f. (J. T. M.); Plymouth, Isle of Man, 

 Connemara, and Oban (Chaster); S.W. Ireland, 40 f., (R. I. A. cruise, 

 1885). Also Sicily (Monterosato), and Tangiers (Chaster). 



Var, unisulcatus Chast. (/. Conch., vo\. 8, p. 373, 1897).— Found 

 occasionally with the type. 



This minute species I first dredged off Southport in 1885, a single 

 specimen only, not quite perfect, and put it aside for a time; but I 

 have never found it in *' drift from the Southport shore," as recorded 

 by Dr. Chaster. 



Note on a colour variety of Cypraea argus. — I have lately acquired a speci- 

 men of C. argus distinctly suffused with pale green colour. It is comi^arable to 

 C. arabica var. eglantina. As far as I am able to ascertain this form has not been 

 previously noted. — L. St. G. Byne {Read before the Society, May 14, 1902). 



1 Ann. and Mag. Nai. Hist. (4) vol. 18, p. 343, 1876. 



2 " Brit. Moll.," vol. 2, p. 541, pi. 68, f. 6-8. 



3 " Crag Moll,," vol. i, p. 139, pi. 15, f. 8«-8/'. N 



