54 Quarterly Journal of Conchology. 



leaves, &c., whilst others, as for instance, C. semimida (Adams) from 

 Jamaica, and C. Trinitaria (Pfeiffer) from Trinidad, are similar in 

 theii' habits to Costa, and love to decorate rocks and Avails with their 

 projecting points. 



I would mention in conclusion the genus Coelocentriim, lately 

 proposed by Miell, Crosse, and Fischer. With all due respect to the 

 oiDuiion of those distinguished naturalists, I consider that similar as 

 the species are to I'ucalodium in every other i-espect, the hollow 

 axis is not of itself a sufficient character to wari*ant a generic 

 sei>ai'ation. 



Those who desire further information I'especting this interesting 

 genus and its allies, are referred to Crosse and Fischer's paper in the 

 Journal de Conchyliologie for 1870, to the same author's "Etudes 

 sur les Mollusques terrestres et fluviatiles du Mexique," now in 

 course of publication, to various important papers by Mr. Bland in 

 American publications, and as for all other genera of Helicidse, to 

 Dr. Pfeiffer's gi-eat work, ^' Monographia Heliceorum," 



A LIST OF THE LAND AND FRESHWATER SHELLS 

 FOUND IN THE NEIGHBOURHOOD OF BANBURY, 

 OXFORDSHIRE. 



By D. PIDGEON. 



The localities from which the following shells were j^rocured lie, 

 for the most part, within a radius of three mUes from the town of 

 Banbury, in Oxfordshire, the exceptions being Edgehill, about seven 

 miles, and Charlbury, about 16 miles distant. At the former place 

 (famous as the site of* the battle of Edgehill) there is much wood, 

 harbouring many species of Helix, while the latter locality is notable 

 for the abundance, within somewhat narrow local limits, of Helix 

 2Jomatia. Geologically, the district comprises the Lower, Middle, and 

 Upper Lias, the Northampton Sand, and the inferior and great 

 Oolite. The fi-esh water species are obtained chiefly from the river 

 Oherwell, a small and sluggish stream which cuts, within the district 

 examined, the Lias formation only, and a section of the Oxford and 

 Birmingham Canal. 



Although it has now been conclusively shown that the supposed 

 connection between Roman remains and the occurrence of Helix 

 2)ornatia is purely fanciful, it is worthy of remark that a fine example 

 of the Roman Yilla stands at a short distance from the spot near 

 Charlbury, where this snail abounds. 



Sphserium corneum. — River Cherwell, abundant. 

 Sphseriuia rivicola. — River Cherwell, abundant and fine. 

 Sphaerium lacustre. — River Cherwell, less abundant. 

 Pisidium amnicum. — River Cherwell, abundant, 

 pisidiiim fontinale. — River Cherwell, abundant. 

 XJnio tumidus. — River Cherwell. 

 Unio pictorum. — River Cherwell. 



