190 BULLETIN OF THE NATURAL BISTORT .SOCIETY. 



GASTEROPODA. 



SCENELLA C. f. RETICULATA, Billings. 



c. f. Scenella reticulata, Bill. Palaeoz. Foss., vol. ii., pt. i., p. 77, 

 (no figure). 

 Some shells were observed which appear to be of this species of 

 Billings. The ornamentation is of sharp thread-like radiating ridges, 

 which, without break, cross over fine striae of growth. Size of the 

 aperture, 7x9 mm. 



Scenella c. f. retusa, Ford. 



Scenella c. f. retusa, Ford. Am. Jour. Sci., 3 ser., vol. v., p. 213 

 figs. 2 and b (page 214). 

 Another species occurs, smaller than S. reticulata, and distinguished 

 by its ornamentation. The radiating ridges are broader than in this 

 species and both radiating and concentric ridges are obscured by a more 

 distinct granulation of the surface. 



RANDOMIA, n. gen. 



This genus does not differ in form from Palseacmaea, but it is char- 

 acterized by strong radiating ridges, which cross the cencentric ridges 

 and prominent undulations of growth, that mark the shell. Mr. E. O 

 Ulrich says that the species of Palseacmtea have only concentric lines 



Randomia Auror/e, n. sp. PI. I., figs. 3 a to c. 



This is one of the most characteristic species of the Etcheminian ; 

 and a species, probably the same, occurs in the St. John Basin of 

 Eopaheozoic rocks. The surface is marked by very fine, sharply raised 

 lines, radiating from the apex toward the margin ; about six are found 

 in the space of one millimetre. Size Opening of the shell 10x25 mm.; 

 height 11 mm. 



The very prominent ridges, straighter dorsal line, and fine radia 

 ting striae distinguish this species from Sienotkeca (!) rugosa and 

 S. (?) panpera, Bill. 



Parmopiiorella (?) paupera, Bill. sp. 

 Stenotheca paupera, Bill. Pal. Koss., vol. ii., pt. i., p. 77 (no figure). 



A few examples occur which agree with this species. The shells 

 are compressed laterally, indicating thai il had a narrow, oval aperture, 



