268 MARINE ZOOLOGY OF ARRAN. 



11C. The study of another important division of animated 

 nature the mollusca has been a favourite pursuit of scien- 

 tific men and of amateur observers. To this division the 

 marine shells belong. Here the conchologist finds his delight 

 in the examination and arrangement of the materials of his 

 department admiring the endless variety of form, and colour, 

 and sculpture; whilst the zoologist is laboriously occupied in 

 determining the anatomical structure of the inhabitants of the 

 shells tracing the peculiarities of the different genera and 

 species. 



The waters around Arran produce a considerable number 

 of shells; but, with few exceptions, the species are common 

 to all parts of the Clyde. The dredge is required to procure 

 specimens of interest ; and, for the information of naturalists 

 unacquainted with the district, it may be stated that the 

 most profitable dredging ground, in Lamlash Bay, lies between 

 Hamilton Rock, near Clachland Point, on the Arran shore, 

 and the north and north-east sides of Holy Island, extending 

 the whole way across, and in depths from fifteen to forty 

 fathoms. A full list of these species will be given at the end 

 of these notices ; but the following genera, as being found in 

 this particular locality, may be here mentioned: Aporrhais, 

 Artemis, Astarte, Cardium, Cerithium, Ghemnitzia, Circe, 

 Corbvla, Crania, Cylichna, Cyprtea, Cyprina, Dentaliui/i, 

 Emarginula, Eulima, Fissurella, Fusus, Kettia, Leda, Lima, 

 Lyonsia, Afangelia, Modiola, Montacuta, Nassa, Natica, 

 Nucula, Odoslomia, Pecten (including P. striatus and P. 

 tigrinus), Pectunculus, Philine, Pileopsis, Pilidum, Psam- 

 mobia, Puncturella, ftissoa, Scalaria, Scaphander, Tellina, 

 Terebratula, Thracia, Trichotropis, Trochus, Tttrritella, and 

 Venus. Several of these genera occur also in other places in 

 Lamlash Bay, and round the coast. On the other hand, 

 Brodick Bay, Whiting Bay, and the vicinity of Pladda, have 

 hitherto proved to be exceedingly unprofitable. Loch Ranza, 

 notwithstanding the apparent advantage of its position, did 

 not yield anything, after several hours of active dredging in 



