Mollusks. 7211 



pools, Allans, Cumbrae ; and Clachland Point, Arran. Common among 

 the shell-sand of Lamlash Bay. Bute, Smith. 



C. Trachea {Brochus striatiiSj Denlalium Trachea^ D. imperforalus). 

 Frequent in dredged shell-sand. 



Fam. X. Ceret1iiad(B. 



Aporrhais Pes-Pelecani (Rostellaria Pes-Pelecani). Frequent. 



*Cerethium adversum {Terehra perversa, Murex adversus). Alive 

 in rock pools, rare. Dead in Lamlash Bay shell-sand, frequent. 



*C. reticulatura {Buccinum reiiculatum, Murex reticulatus). Ex- 

 tremely common. The most abundant shell in the district. 



Fam. XI. ScalariadcB. 



Scalaria communis {Scalnria elaihrus). I have procured through 

 fishermen two or three specimens which were dredged in Lamlash Bay, 

 where Dr. Landsborough has also taken it. Mr. Hennedy has met 

 with the species at Gourock. — (' The Naturalist,^ 1852, vol. ii. p. 88). 



S. Turtonis. Once dredged alive between the Corriegills and 

 Clachland Poiut, Arran. Ayr, Bute, Smith. 



Fam. XII. Pyramidellidcs. 



Adis nitidissima {Tiirritella nitidissima). One example dredged 

 close to the Clerk Rock, Isle of Cumbrae. Lamlash, Landsborouyh. 



A. unica {Turritella unica). Lamlash, Landsborough. 



Eulima polita. Occasionally taken throughout the district, but 

 rare. 



E. nitida, Philippi. Lamlash Bay, rare. 



E. bilineata [Eulima subulata). Lamlash, Landsborough. 



E. distorta. Not uncommon in rock pools and by washing sea- 

 weeds dredged in the Laminarian zone ; also dead in Lamlash Bay 

 shell-sand. A strongly marked, much elongated, straight and larger 

 variety of this shell from the " Clyde district " is distinguished by 

 Forbes and Hanley under the name of gracilis. I have procured it 

 abundantly from off Tarbert in Loch Fyne, but have not met with it in 

 the Firth of Clyde. 



Cheranitzia rufescens. This is probably specifically identical with 

 C. scalaris, scalaris being the southern and rufescens the more usual 

 northern form of the same shell. Chemnitzia rufescens " is a rare 

 animal, occurring occasionally and sparingly in the Lochs of the Firth 

 of Clyde." — Forbes and Hanley. I have taken it in Lamlash Bay. 



C. indistincta. Not uncommon alive in rock pools ; also taken vvilh 



