Mollusks. 



5877 



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

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

 ish Museum. 



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

 )r. Landsborough (Excurs. p. 362) in a list of Lamlash Mollusca. 



casina [Venus reflexa, Venus cassina). This beautiful Ve- 

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

 ]^umbrae ; it is, however, by no means abundant, and I only suc- 

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

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

 Drobably distributed throughout the district. 



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

 nosd). 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. 



,3 ovata. This species is common among nuUipore in the 

 laminarian and coralline zones. 



^Artemis exoleta i^Cytlierea 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 Uncta). 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 undala). 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. Cyprinid(B. 



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

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



