278 APPENDIX. 



Vol. iii. p. 255. Chemnitzia indistincta. 



To this species, Mr. Jeffreys in his interesting monograph of 

 the British Odostomice has referred the liissoa Ballice of Thomp- 

 son (Annals Nat. Hist. Vol. v. p. 98, pi. 2, f. 9), stated to have 

 been found at Youghal in Ireland by Miss M. Ball. The speci- 

 men having been lost, we cannot verify the correctness of the 

 identification ; we know, however, of no other indigenous shell to 

 which it could be referred, and the delineation is not at all unlike 

 some of the varieties of that variable species. The description 

 runs thus, — " elongated, white, apex obtuse, five slightly rounded 

 whorls, deeply marked longitudinally with somewhat distant 

 stria?, aperture ovate, margin of the mouth thin, lower portion 

 of the first whorl spirally striated. Length a line and a half. 

 Although of a more slender form, this species, in sculpture, &c, 

 somewhat resembles Odostomia spiralis, but is a true Rissoa^ 



Vol. iii. p. 259. Chemnitzia eximia, Jeffreys. 



With not very numerous longitudinal ribs, that are clathrated by two 

 or three spiral lyrse on the principal turns ; whorls more or less rounded, 

 not excavated above the suture ; fold quite obsolete. 



Plate XC. fig. 1, as Rissoa eximia. 



Iiissoa eximia, Jeffreys, Annals Nat. Hist, new ser. (1849) vol. iv. p. 299. 

 Chemnitzia Barleei, Clark, Annals Nat. Hist, new ser. vol. vii. (1851) p. 129. 



So few examples of this minute shell, whose sculpture ap- 

 proaches very closely to that of 0. excavata have reached us, that 

 we neither feel positive as to their maturity, nor certain as to 

 their genus : from the obliquity of the nucleus, we have pro- 

 visionally attached the species to those of the present group. 



The shell is of an oblong-subturreted shape, moderately thin, 

 but not transparent, and of an uniform whitish hue. The spire, 

 which scarcely exceeds the body in length, is composed of three 

 whorls and a half, that are profoundly separated by a not much 

 slanting suture, and terminate in a large blunt rather obliquely 

 disposed prominent nucleus ; they are ventricose, obtusely sub- 

 scalariform of rather fast longitudinal increase, and of moderate 



