Mr, H. J. Carter on the Structure of the Foraminifera. 309 



but the shell is not ribbed, and otherwise differs. In some 

 respects it resembles Geomelania ; but the shell, again, is smooth, 

 and covered with an olive epidermis, like that of Acicula and 

 Tomichia. The animal, however, certainly docs not agree with 

 Tomichia, w^hich I have lately had an opportunity of observing 

 in two Japanese species, nor with Acicula, if, indeed, this genus 

 has been correctly described. 



Dr. Pfeiffer, in his account o^ Acicula, observes, "Eyes on the 

 upper part of the head; tentacula subulate;" and Dr. Gray says 

 of the same genus, "Eyes on the back of the head, between and 

 rather behind the base of the tentacula." The figure of Acicula 

 fusca, copied from Hartmann by my brother and myself, in our 

 ' Genera,' has subulate tentacles ; and the same is the case with 

 my figure of Truncatella in the same work, which was taken 

 from a very lively individual which I had in my possession for 

 some time. If I had only observed a stray example of Cecina 

 in confinement, I should have thought the animal was sick, and 

 that the tentacles were contracted ; but I have seen hundreds 

 crawling about the damp rotten logs, after I had turned over the 

 latter for the purpose of watchiog the habits of these strange 

 little mollusks. They resemble Truncatella in their mode of 

 progression — fixing Llieii- long muzitle and dragging their shell 

 and body close up to the fixed point, and then, fixing in turn 

 their short foot, advancing the muzzle for another stride, 



Shanghai, China, 

 Jan. 15, 18(il. 



XXXIV. — Further Observations on the Structure q/" Foraminifera, 

 and on the larger Fossilized Forms of Scinde, \'c., including a 

 new Genus and Species. By H. J. Carter, Esq., F.ll.S.* 



[Plates XY. XVI. & XVII.] 



Since my observations on the structure of Opei'culina arahica 

 and my description of some of the larger forms of fossilized 

 Foraminifera in Seinde were published, in 1852 f and 1853 J 

 respectively, many valuable contributions have been made to our 

 knowledge of the structure and species of the Foraminifera, 

 amongst which those that I shall have to refer to most here are 

 MINI, le Vicomte d'Archiac and J. Haime's ' Monograph on the 

 Nummulites §,' and Dr. Carpenter's ' Memoirs ' on the structure 



* Communicated by the Author, having been read before the Bombay 

 Branch of the Royal Asiatic Society, April 11, 1861. — A brief summary of 

 the results was given in the September Number of the 'Annals.' 



t Ann. & Mag. Nat. Hist. ser. 2. vol. x. p. 161. % ^^- vol. xi. p. 425. 



§ Description des Animaux Foss. du Groupe Nummulitique de I'lude. 

 aris, 1853. 



