253 



ObtaiiiL'd from the Devonian sandstone of Ereie. "wiiere it is very 

 abundant, occurring ^^■lth VituUna pustulosa, Spirifera Pedroana, 

 Retzia, etc. (Morgan Expeditions 1870 and 'Tl.) 



Named in honor of Mr. Herbert II. Smith, one of the assistants 

 on the Morgan Expedition of 1870. 



Clioiietes Onettiaiia, Rnthhun, sp. nov., Plato X, figs. 43 and 48. 



Test below medium size, gibbous, transverse, semi-elliptical in outline, with 

 tlie width probably greatest along the liinge line, and equal to about one and 

 one-third or one and one-fourth the length ; anterior margin not very strongly 

 rounded. 



The ventral valve is very convex, being well rounded from the beak to the 

 front; most prominent at or just in front of the middle, where it is very 

 slightly flattened. The valve rises more or less rapidly from the sides, in a 

 curve which becomes a little straightened across the middle. The sides are 

 somewhat flattened towards the cardinal angles, which last are slightly 

 reflected. Beak small, depressed, with the minute apex projecting but slightly 

 beyond the hinge line. Median septum small and well defined, about one- 

 fourth as long as the valve. 



Dorsal valve unknown. 



The interior moulds are ornamented with fine, radiating, raised lines, but 

 very indistinctly preserved on the specimens obtained. Length 11 m. m., 

 breadth about 15 m. m. 



From C. Ilcrhert-Sinithii this species is easily distinguished, by its 

 hirger size and the finer radiating lines. It may prove to be a 

 A'ariety of C. scitula, Hall, Hamilton group, New York, but 

 the specimens of C. Onettiana are larger than those of C. sciiula, 

 and differ from them in many details. 



Associated with Spin'/era Pedroana, etc., in the Devonian sand- 

 stone of Erere. (Morgan Expedition of 1871.) 



Dedicated, at Prof. Ilartt's suggestion, to Senlior Onetti cf 

 Monte-Alegre, to "whom he is much indebted for aid rendered in 

 his Expeditions of 1870 and 1871. 



Choiictes , Plate IX, fig. 24. 



There was obtained from Erere, a single specimen of a ventral valve of CVio- 

 netes, of about the same size as the last sjaecies described, which differs from 

 it, however, both in shape and in ornamentation. 



