592 Records of Dredging, 



ashore. Allied to it is a shell well known, in Scottish collec- 

 tions, under the name of Patella clypeus (figured in Brown's 

 Illustrations). It is found plentifully at the Gair Lock, oppo- 

 site Greenock, and in Arran. It differs from P. ClealancU in 

 its larger size, its more acute apex, deeper longitudinal stria?, 

 and in the markings being reticulated on the upper part of 

 the shell, whilst they are radiated on the lower. I have found 

 a similar shell in Siaellard. Is the " Patella testudinaria," 

 indicated by Mr. Lowe, in one of his papers in the Zoological 

 Journal, identical with this species ? 



The animal of Fissurella grse^ca (a species which is pretty 

 frequent on the Manx coast) is often of a beautiful rose 

 colour, sometimes vermilion : this appears to be occasioned 

 by its food, which consists of a red spongy zoophyte, incrust- 

 ing the Pecten operculars, and staining the shells of the 

 pecten of a brick-red colour. I have seen the Cassulus hun- 

 garicus affected in the same way ; but, though Emarginula 

 fissura occurs in great plenty in the same locality, 1 have 

 never found a specimen so tinged. By the way, there is a 

 shell allied to Emarginula, the " Slpho " of Captain Brown, 

 on the nature of which some remarks appeared in the Athe- 

 nceum some time ago [see the date of this communication], 

 wherein the reviewer stated his opinion that the shell was, if 

 I remember right, a young Fissurella. At the time I was in- 

 clined to think the same ; but, having since seen a specimen in 

 Captain Brown's possession, I am now fully persuaded not 

 only that the shell is not a young Fissurella, but that it pos- 

 sesses considerable claims to generic distinction. The spe- 

 cimen I saw was evidently an old shell, and appeared, at first 

 sight, to be a full-grown example of Emarginula fissura, from 

 which it differed, externally, in the slit not being prolonged 

 to the margin ; internally, it presented its most obvious dis- 

 tinction in the form of an appendage arching over the slit, 

 and opening about half way down the shell. It may prove 

 to be a subgenus of Emarginula. It connects, by its conform- 

 ations, Emarginula with Scissurella, and both, in some mea- 

 sure, with Calyptrae v a and Crepidula. It is said to have been 

 dredged up at Greenock. 



The 2?uccinum striatum of Pennant occurs in great plenty 

 in the Irish Sea, being almost more common than the true 

 B, undatum ; but the animal differs in no respect from that of 

 the latter, and therefore I look upon it as no more than a 

 variety. To the same rank I would also reduce B. carinatum 

 of Turton, of which, by the by, I once saw a specimen, pro- 

 bably from Greenland, in that part of the collection of Otho 

 Fabricius which is at present in the possession of Professor 



