364 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 12, OCTOBER, I9OO. 



Penally Marsh below Giltar. Some remarkably globose shells come 

 from the same ditch, one specimen being of the same breadth as its 

 length, viz., 8-5 mm. 



Var. nucleus. — Ditch by the Black Rock. 



S. lacustre. — There are three small ponds containing this species. 

 One, near Hoyle's Mouth, has a large form of the type, and a smaller 

 form of a beautiful pearly-grey shade, almost white. They live together 

 in the same part of the pool, and all sizes from the very young to the 

 mature shells have been taken in both forms; moreover, the difference 

 in colour is constant all through. Another pond near the gas-works 

 contains the type, and a small pond near Holloway Quarry a form 

 allied to the var. ryckholtii. 



Pisidium amnicum. — The Ritec stream near Gumfreston. The 

 shells are large, 10 to 19 '5 mm., and live in the same part of the stream 

 as the Anodonta anatina var. complanata. 



P. fontinale. — Common in the marshes ; it is, however, as a rule 

 rather small in size, and variable in shape. 



Var. cinerea. — Very fine in a pond near the gasworks, and a 

 pool near the old mill. 



P. pusillum. — Abundant everywhere, and especially fine in the 

 Black Rock ditch. 



Var. obtusalis. — Penally and Gumfreston Marshes. 



P. milium. — Common on the Penally Marsh and in a few ditches 

 elsewhere. Specimens from a ditch below Giltar are above the aver- 

 age size, and an aberrant form has been taken on the marsh near 

 Penally Station ; it is larger, more oval, and coloured differently from 

 the type. 



The following records for the county of Pembroke are not given 



Adams " The Collector's 



Buliminus obscurus. 

 Ccecilioides acicula. 

 Planorbis fontanus. 

 P. nautileus. 

 Limncea truncatula. 

 Sph cerium lacustre. 

 Pisidium amnicum. 

 P. milium. 



