338 PAL^ONTOLOGT OF NEW-YORK. 



plate from ihc inner anterior angle of the cheek touches the front lobe of the glabella near its 

 anterior angle. Axis of the body convex, nearly as wide as the lateral lobes ; pleura convex 

 and straight for half their length, and then gently curved downwards and flattened, grooved 

 along the centre. Caudal shield with eight rings in the middle lobe ; lateral lobes with six flat 

 ribs strongly bent downards ; surface granulate, with larger tubercles on the glabella and other 

 parts. 



The specimens examined are all imperfect, and the surface markings are also more or less 

 obliterated. The characteristic features are the deep furrow along the front and cheek margins, 

 and between the glabella and cheeks, and the projecting lobes from the inner margins of the 

 cheeks which touch or unite with the glabella, arching over the axal furrow. In the two sepa- 

 rated cephalic shields, the portion beyond the facial suture is wanting, and in the more entire 

 specimen it is too obscure to be characterized. 



Fig. 1 a. A specimen preserving eleven articulations of the thorax, and a large part of the 



cephalic shield. 

 Fig. 1 b. The central part of the cephalic shield, the lateral portions being separated at the 



suture. In this specimen, the connexion of the cheeks with the glabella is shown 



upon one side. 

 Fig. 1 c. Another cephalic shield, in which the central portions are better preserved. 

 Fig. 1 d. The caudal shield. 

 Fig. 1 e. Front view of the cephalic shield, from which the marginal rim is broken, showing the 



arched projections from the eye to the glabella. 



Position and locality. In the Coralline limestone at Schoharie. 



(Collection of John Gebhahd junior.) 



705. 3. CYTHERINA ALTAI 



PL. LXXVIII. Fig. 2o-d. 



Reniform, wider posteriorly, very convex in the middle, and somewhat depressed towards 

 the two extremities ; dorsal margin straight, much shorter than the width of the shell ; a small 

 node near the anterior dorsal angle ; surface papulous. 



Mr. Conrad cites Cytherina alta from the Tentaculite limestone, and it is possible the 

 present maybe identical with that one ; but in specimens examined, this species is more nearly 

 equal at the two extremities ; while in those in the tentaculite limestone, the anterior end is 

 narrower than the posterior. I have not seen surfaces of the latter well preserved. 



Fig. 2 a, h, c. Individuals of different size. The minute tubercle referred to is shown in fig. 1 c. 

 Fig. 2 d. An enlargement of the surface, showing the papulose character. 



Position and locality. In the Coralline limestone at Schoharie. 



