Molhisks. 



5879 



*Cardium echinatum [Cardium ciliatum and ciliare). To be found 

 in many of the sandy bays, as for example at Fintry Bay, Cumbrae ; 

 and in certain parts of Lamlash. 



* „ edule [Cardium crenulaiiim). Nowhere, as far as my 

 observations go, abundant, though generally diffused. 



„ nodosum. Fine and by no means uncommon. Shell 

 Bay, Cumbrae ; Largs ; Lamlash Bay ; and between Clachland Point 

 and the Corriegills, Arran. 



5, fasciatum {Cardium elongatum). Frequent in the lami- 

 narian and coralline zones. Fairleigh ; Tan Buoy, Cumbrae ; Lam- 

 lash. 



* 5? pygmaeum {Cardium exiguani). Ayr, Bute, Clyde, 

 Smith ; Lamlash, Landshoroiigh. 1 have not myself been fortunate 

 enough to meet with it. 



„ suecinum. Included by Dr. Landsborough in his last 

 corrected catalogue of the Lamlash Bay Mollusca. 



* 5, norvagicura {Cardium l(evigatum and serratum). Fre- 

 quent and widely distributed throughout the district. There are two 

 very distinct forms of this shell : the one which is found in the Clyde 

 is subtriangular, the hinder margin being much produced, so that the 

 length exceeds the breadth ; two inches and three-fourths long and 

 two inches and five-eighths broad is the measurement of my finest 

 specimen : the other variety, which I have taken off Falmouth, is 

 subovate, the hinder margin suddenly sloping, and not at all pro- 

 duced, the breadth exceeding the length, as, for example, one inch 

 and three-fourths long and two inches and one-fourth broad. On the 

 Devon coast I have taken an intermediate form, in which length and 

 breadth are about equal ; it is this form which is figured in Forbes 

 and Hanley. 



Fam. XV. Lticinidce. 



*Lucina borealis {Lucina Radula), Ayr, Smith. It is not uncom- 

 mon in shallow water just off the pier at Lamlash, and I have like- 

 wise taken a specimen or two in Kames and Shell Bays, Cumbrae. 



„ spinifera {Myrtea spinlfera). Occurs several times in the 

 lists of Lamlash Bay Mollusca in Dr. Landsborough's ' Excursions.' 

 1 have not myself met with it. 



* „ flexuosa {Lucina sinuosa). Bute, Ayr, Smith, Widely 

 distributed in the district, though nowhere common. Largs, Cum- 

 brae, and Lamlash Bay have given me specimens. The spot in which 

 1 have dredged it most frequently is close to the Clerk Rock in 



