305 



have a gentle forward curvature from the carina to near the margin 

 of the umbilicus, where they become obsolete. 



Tbis shell appears to be identical with an undescribed species from 

 the Chemung group of New York, in the collection of Prof Hall. 

 Species of this type, with broadly-expanding apertures, are quite 

 common in the Hamilton and Chemung groups of N. York. 



CEPHALOPODA. 



Genus Goxiatites, De Haan. 



GONIATITES OPIMUS (n. Sp.) 



Shell depressed suborbicular, umbilicus rather small, varying some- 

 what in different individuals. Volutions three to four or more, their 

 ventral borders only showing in the umbilicus, the remaining portion 

 being embraced within the succeeding volution ; depressed convex on 

 the sides, rounded on the margin of the umbilicus, and on the dorsum. 

 Axial diameter equal to one-third of the transverse diameter of the 

 shell. Aperture depressed semilunate, three-fifths as wide as long; 

 the inner volution occupying nearly one-half of its length. Septa 

 moderately distant, divided into six lobes and six saddles ; form of 

 dorsal lobe not determined ; dorsal saddle but little elevated, forming 

 with the superior lateral lobe and lateral saddle shallow undulations; 

 inferior lateral lobe deeper than the others ; breadth and depth about 

 equal, rounded at bottom ; ventral saddle much wider than the other, 

 highest at its outer end, and gradually declining to the umbilicus ; 

 extending about one-third of the distance across the volution. 



Surface of the shell marked only by very fine transverse lines of 

 growth. 



RADIATA. 



Genus Lophophyllum, Edwards & Haime. 



LOPHOPHYLLUM CALCEOLA (n. Sp.) 



Coral small, subturbinate, oblique, more or less curved, moderately 

 but irregularly expanding from the base upward ; flattened on the 

 outer side of the curvature, and rounded on the inner side ; transverse 

 section subtriangular, subelliptical, or circular in diiferent individuals. 

 Apex small, pointed ; exterior surface rugose, from unequal growth. 

 Interior of cup of moderate depth, characterized by a subcentral 

 fossette, which extends from the centre to near the back, and is equal to 

 about one-eighth of the transverse diameter of the cup in the centre, 

 and gi^adually contracting towards the dorsal sides ; also by about 

 thirty principal rays, in a specimen of three-eighths of an inch in 

 transverse diameter, which converge towards and coalesce near the 

 margin of the cavity. Smaller rays, to a number equal to the principal 



PROCEEDINGS B. S. X. H. — VOL. VIII. 20 MAY, 1862. 



