GLOUCESTER, DORSET, AND SOMERSET. 9 



"We have hitherto confined our attention to the Cephalopods ; but 

 the Gasteropods tell the same tale. In the Bradford-Abbas quarry 

 alone have been found as many as fifty species of univalves, many 

 of which belong to the Cotteswolds*. There is, however, a large 

 array of new forms in the genera Pleurotomaria, Chemnitzia, Turbo, 

 Troclius, Natica and Solarium; and others abound. 



These, like the Ammonites, are in a wonderful state of preser- 

 vation. 



The Brachiopoda are not so numerous as in the Cotteswold district; 

 still the forms met with in the Cephalopoda-bed point also to the 

 high position it occupies in the Inferior Oolite ; such are 



Terebratula Phillipsii, Mot. 8[ Dav. Terebratula sphreroidalis, Sow. 



perovalis, Sow., and var. ainpla, Ehynchonella spinosa, Schl. 



Buckm. media, Sow. 



Buckmanni, Dav. and others t. 



And others abound. 



The Conchifera afford a list for our limited area as large as is to 

 be met with in the whole of the Cotteswolds, numbering over 150 

 species. Amongst them the following genera — Trigonia, Lima, Pecten, 

 Cucullcea, Modiola, Perna, Cardium, Astarte, and others, present a 

 most interesting assemblage of forms. 



Neither the Eehinodermata nor the Zoophyta present the same 

 number of species as the Cotteswolds ; but in places a few species 

 occur abundantly. 



Taken then as a whole, we may conclude that the Dorset Cephalo- 

 poda-bed is one of the richest deposits in the country, although 

 as yet we cannot pretend to have exhausted or to have made out all 

 its treasures ; but it would seem that within this thin stratum are 

 stored up most of the important forms which make up the mass of 

 the Cotteswold fauna. 



It would appear, indeed, that out of about 250 species of shells 

 tabulated by myself in the second edition of Murchison's ' Geology 

 of Cheltenham,' fully 200 belong to the Cephalopoda-bed of Dorset; 

 whilst in this latter county are found many specimens of which the 

 Cotteswolds cannot boast, most of which, so far as the Cephalopoda 

 and Gasteropoda are concerned, are figured in D'Orbigny's ' Terrains 

 Jurassiques.' 



* These have since been increased to nearly 100 species. 

 t Since the above was written the Brachiopoda from the district have been 

 sent to Mr. Davidson, and he has made out nearly 30 species. 



