202 REPORTS. 



Mr. E. D. Marquand, A.L.S., reports as follows : — 



Since the publication, two years ago, of. my paper on 

 the Marine Shells of Guernsey and the Lesser Channel 

 Islands, in the Transactions of this Society, Mr. J. T. 

 Marshall has completed his Additions to British Conckology, 

 and in the concluding portion of this valuable work there 

 are several species and varieties of marine shells from these 

 islands which do not figure in my list. These are enumerated 

 below, together with a few additional species found within 

 our area by other conchologists. 



The total number of marine shells, exclusive of named 

 varieties, recorded for the Sarnian Islands in the pages of 

 these Transactions, now amounts to 328 species. 



I should like to notice the re-discovery of one of the 

 rarest of our Fresh-water shells, Li/nncea glabra. This species 

 used to occur in Guernsey many years ago, but it is now 

 believed to be extinct. Last year it was my good fortune 

 to find a small colony of living specimens in a little cliff 

 pool at Trois Vaux, in Alderney. 



Galeomma Turtoni, Eds. Zool. Journ. Alderney, one imperfect valve in 



shell sand (Mrs. Marquand). 

 Lepton squamosum, var. lineolata, Jeff. Guernsey, 20 fms. (Marshall). 

 MontaCUta bidentata, var. ettiptica, Wood. Guernsey (Marshall). 

 M. fePFUginosa, Mont. Valves frequent in all the islands except Alderney. 



Living at Herm (Marshall, in lit.). 

 Tellina tenuis, Dae. Bordeaux Harbour, a valve (Mrs. Marquand). 

 T. fabula, Gron. One valve at Bordeaux Harbour (Mrs. Marquand). 



Psammobia tellinella, var. lactea, Marsh. Guernsey and Herm (Marshall)- 

 Var. purpurea, Marsh. Guernsey and Herm (Marshall). 



Ceratisolen legumen, L. One fine dead specimen was found some years 

 ago on the shell-beach at Herm by Mrs. Marquand. 



Xylophaga dorsalis, Turt. A log of timber washed ashore in Alderney 

 in 1902 contained an abundance of these curious shells. 



Teetura virginea, Mull Mr. Marshall informs me that the elevated form 



recorded in my list as being common on the shore is merely a raised 



typical form, and not var. conica. 

 Lacuna pallidula, var. imperforate Marsh. Guernsey (Marshall). 

 RiSSOa Striatula, var. ecarinata, Mtros. This variety is stated in my paper 



to be " rather commoner than the type," but Mr. Marshall says this is 



not correct. He has found only two specimens in Guernsey, and it is 



everywhere extremely rare. 

 R. membranaeea, var. data, Phil. Mr. Marshall writes me that the record 



"'occurs singly (Tomlin) " must be a mistake; var. elata is a 



brackish -water shell, and abundant where it occurs. 

 Jeffreysia opalina, Jeff. Through an oversight the relative frequency of 



the two species of Jeffreysia occurring in Alderney was reversed. /. 



diaphana should have been noted as by far the commoner species of 



the two. 

 HomalOgyPa rota, var. tricarinata, Webst. Guernsey (Marshall). 



