332 



PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [June 19, 



supra striolata, umbilico majore ; apertura subovali, satis regulariter 

 excavata; labro simplici. Long. circ. 1 poll., div. eirc. 130°. 

 " Hah, In stratis carboniferis Acadige, Bawson^ 



Zonites {Conulus) jpriscuSj Carpenter. 

 ■h 



a. Natural size. e. Fragment of Zonites (Conulus) prts- 



b. Magnified. cus, showing lip ; the dotted lines 



c. Portion of surface highly magnified. indicate a portion of the columella 



d. Portion of the surface of Pujpa (crushed) and the u.mbilicus. 



vetusta, highly magnified. 



" A few specimens only of this shell were found, in company with 

 numerous individuals of Ptjpa vetusta, Dawson, from which species 

 it differs in form, sculpture, nuclear whirl, and texture. Pu^a 

 vetusta closely resembles the living race of small Pupae, and seems to 

 have been (for its size) solid, and coarsely sculptured parallel to the 

 axis. The present species has a different colour, though in the same 

 matrix, and seems to have been an extremely thin shell, of a horny 

 (though not glossy) texture, like the British Helix (Conulus) fusca 

 and similar species. The markings consist of rather irregular 

 striolae with occasional coarser ridges of growth, somewhat slanting 

 toward the periphery, which is rather flattened though not angular. 

 The base is concave, similarly sculptured, and gradually curving into 

 a rather large umbilicus. At least such is the inference from the only 

 portion that has been cleared from the matrix. The nuclear part in 

 this shell is much smaller than in Pupa vetusta. In the Pupa the 

 first whirl is large and swollen, the next suddenly assumes the 

 normal cylindrical form ; and it is not until the end of the third whirl 

 that the normal sculpture is developed. In the present species the 

 growth, form, texture, and sculpture of the shell appear nearly uni- 

 form from the beginning. 



"It is difficult to state exactly what was the original shape, as 

 even in the most perfect specimen the body-whirl is broken ; but it 

 was probably like Paryphanta Caffra, Per., on an extremely small 

 scale. It might possibly rank with Hygromia, or, with the living 

 American species miniLSCula and exigua, under Pseudohyalina, Morse. 



