MoUusks. 



6877 



Ryan, to the south of this district, it may be procured in great abun- 

 dance at low-water mark ; specimens from this locality are in the Bri- 

 tish Museum. 



Venus verrucosa. I include this with doubt. Mentioned once by 

 Dr. Landsborough (Excurs. p. 362) in a list of Lamlash Molkisca. 



„ casina ( Venus rejlexa^ Venus cassina). This beautiful Ve- 

 nus is met with occasionally* on the scallop-bed off the south-west of 

 Cumbrae ; it is, however, by no means abundant, and I only suc- 

 ceeded in procuring some half-dozen specimens. I have likewise 

 taken it in Lamlash Bay, and Mr. Smith records it from Ayr. It is 

 probably distributed throughout the district. 



„ striata [Venus Prideaiixiana, rugosa^ gallina and lami- 

 nosa). Common, and is found with the concentric costellae at a 

 greater or less distance apart, and more or less laminated. 



* „ fasciata. Frequent throughout the district. The colour 

 of these shells from the Clyde are usually dull, and have none of that 

 brilliancy which characterizes their more southern brethren. They 

 are usually, moreover, when found in the Clyde, invested, especially 

 about the umbones, with a black incrustation. 



„ ovata. This species is common among nullipore in the 

 laminarian and coralline zones. 



^Artemis exoleta {^Cytherea exoleta). Two very distinct varieties 

 are to be found in the Clyde district ; the first, the ordinary form, 

 occurs in and outside Lamlash Bay and other localities ; the second 

 is brownish white, entirely devoid of painting, and has the striae much 

 more closely arranged than usual, and they, moreover, become some- 

 what raised and lamelliform at the extremities. This last variety, 

 which measures two inches by two and an eighth, is taken near the 

 Tan Buoy, Cumbrae. 



„ lincta {Cytherea sinuata and lincta). Ayr, Lamlash, 

 Cumbrae, Largs. The locality in which I have found it to be most 

 numerous is between the Cumbraes. I have a distortion in which 

 one valve is larger than the other, the one umbone projecting for- 

 wards over the smaller one as in the genus Corbula. 



*Lucinopsis undata {Lucina undaia). I have occasionally met 

 with the Lucinopsis to the south-west of Cumbrae, and Dr. Lands- 

 borough has taken it in Lamlash Bay. 



Fam. XIII. Cyprinidce, 



*Cyprina islandica {Cyprina vulgaris). The dredge will not un- 

 frequently bring up the Cyprina from deep water where the ground is 



