TEREBRATULA. 69 



from a specimen of T. carnea, but from a flattened variety of T. semiglobosa ; and the 

 author has rendered his species the more problematical, by adding, that his friend 

 Mr. Meade had sent him specimens from the Cornbrash, \\ inch in length ! Dr. Mantell 

 refers to T. subrotunda, Sow., a shell from Hamsey and Eastbourn (Sussex), 1 but 

 Messrs. Waterhouse and Woodward, who have seen the original, have pronounced it to be 

 simply a depressed young individual of T. subundata or T. semiglobosa, and agreeing with 

 Sowerby's type. I may add, that I likewise possess specimens of T. semiglobosa, from 

 Glyndebourn, near Lewes, quite as circular and depressed as the figure of T. subrotunda 

 in the ' Min. Con.' 



Some authors 3 have likewise erroneously described T. ovata (Sow.) as a synonyme 

 of T. carnea, a mistake principally referable to Dr. Mantell, 3 who does not appear to have 

 been acquainted with Sowerby's type, which was stated to occur at Chute, near Heytes- 

 bury, in Wiltshire, an Upper Green Sand locality, where no true specimen of T. carnea 

 has been discovered. 



The great resemblance T. carnea bears to some examples of the recent T. vitrea, did 

 not escape the observation of the late Baron Von Buch ; 4 ' but I am disposed to coincide 

 with M. D'Orbigny, in the belief, that they are specifically distinct. T. vitrea never 

 presents the colour with which we believe T. carnea was tinted. 



The foramen in some examples is so small as hardly to afford space for the passage of 

 a hair ; but in the generality of individuals the aperture, although always small, is far from 

 presenting such minute proportions. 



In the neighbourhood of Norwich, a great number of internal siliceous or flint casts 

 of this species have been collected by Mr. Fitch, on which the muscular and other im- 

 pressions are beautifully represented. 



Sowerby mentions that he found Ter. carnea in the soft Chalk of Towse, near 

 Norwich, and from that locality many beautiful examples have been procured by 

 Messrs. Fitch, Woodward, Image, and others ; it likewise occurs at Trimmingham, 

 Brighton, in Ireland, and in many other Chalk localities. On the Continent, it is very 

 common in similar deposits at Meudon, near Paris ; Halden, Westphalia, in Russia, 

 &c. ; but seems to be very rare in Lower Chalk beds and localities characterised by 

 T. semiglobosa. 



Plate VIII, fig. 1. A typical specimen of T. carnea from the Chalk of Trimming- 

 ham. 

 „ fig. 2. Interior of the larger or ventral valve. 



„ fig. 2". Interior of the smaller or dorsal valve, with the loop. 



1 Geol. of Sussex, p. 130. 



2 Among these, we may mentionM. D'Orbigny (see 'Pal. Franc., Terrains Cretaces,' vol. iv, p. 103, 

 1847). —Dr. Bronn ('Index Pal.,' vol. ii, p. 1232).— See also Nilsson and Hisinger. 



3 Geology of Sussex, 1822. 



4 Memoirs de la Soc. Ge'ol. de France, vol. iii, p. 204. 



