-O AMERICAN JOURNAL 



Huandoval and Coron^o, Prov. of Conchucos, the other from 

 near OHon, Prov. of Cajatambo, both of which he considers 

 Jurassic, and which, in the imperfect state of preservation, I can- 

 not distinguish from the present species. The shell from Ollon 

 is entirely unlike the recognized Jurassic fossils of that locality, 

 in its lithological characters, and 1 su?pect that there may be a 

 deposit of Tertiary there, which has been confounded by the 

 Doctor with the other fossiliferous rocks. C Iceviusculum is 

 allied to C. leve, Quoy, from Australia, but its Avhorls are higher 

 and less numerous, its apical angle is much narrower, the last 

 whorls are more convex, the canal is less twisted and the mouth 

 is longer. 



LITTORINA, Fer. 



L. LAQUEATA, Gabb. 



Shell small, elevated trochoid ; spire high, whorls five and a 

 half, rounded, converging toward the suture, strongly sculptured 

 by heavy, slightly oblique, long'tudinal ribs a little narrower 

 than the interspaces; these ribs commence just below the suture 

 and on the body whorl end at the margin of the base ; they are 

 about twelve in number to a volution and are crossed by a few 

 elevated, revolving threads ; base ornamented by closely-placed 

 revolving ribs, showing a slight tendency to alternate in size. 

 Aperture sub-circular ; inner lip narrow, flattened. 



Length '5 in. ; length of aperture '2 in. ; width of body 

 whorl -31 in. 



Found associated with Fiisus Paytensis and Tritonium perno- 

 dosum. 



YOLUTILITHES, Swains. 

 V. PLICIFERA, Gabb. 



Shell elongate, fusiform, spire elevated, whorls (number 

 unknown, apparently five or'six 't) flattened^on the sides. Body 

 whorl with a narrow sloping shoulder near the suture, straight 

 below for a short distance, and then gradually converging in 

 advance. Surface ornamented by about twelve or fourteen 

 straight, longitudinal ribs or folds, starting at the margin of the 

 shoulder and ending at the point where the sides begin to con- 

 verge. Aperture long, narrow ; inner lip with two (?) small 

 oblique folds. 



This species is described from a number of internal casts, and 

 I should not have ventured to characterize it, were it not for its 

 close resemblance to a species of the Tertiary of California and 

 Oregon. The most perfect fragment, less a portion of the spire 



