258 



Obtained from the Devon iaii sandstone of Ereie, "where it is very 

 abundant, occurring witli Yitulina pustiilosa, Sjjirifera Pedroana, 

 Retzia, etc. (Moi-gan Expeditions IS TO and 'Tl.) 



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

 on tlie Morgan Expedition of 1870. 



Chonetes Ouettiaiia, Rnthhun, sp. nov., Plate X, fig-s. 4^ and 48. 



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

 tlie width probably greatest along the hinge 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 Avliich 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. Ilcrherf-Snufliii tliis species is easily distinguislted, bv its 

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

 variety of C. scitula, Hall, Hamilton group, New York, but 

 the specimens of C. Onetticma are larger than those of C. scitula, 

 and differ from them in many details. 



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

 stone of Erere. (Morgan Expedition of 1871.) 



Dedicated, at Prof. Hartt's suggestion, to Setihor Onetti ( f 

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

 his Expeditions of 1870 and 18U. 



Chonetes , Plate IX, fig. 24. 



There was obtained from Erere, a single specimen of a ventral valve of C7u>- 

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

 it, however, both in shape and in ornamentation. 



