V. Ox THE MOLLUSCAX FaUNA OF THE LATER TeRTIARY OF 



Peru.* By Edward T. Nelson, PI1.D. 



The followmg pages give the results of an examination of a collec- 

 tion of fossil MoUusca from Zoi'ritos, Peru, presented to the INIiiseum 

 of Yale College, in 1867, by Mr. E. P. Larkin and Prof F. H. Bradley. 



The paper is simply a preliminary one, giving a catalogue of the 

 genera found in the collection, with descriptions of a part of the species. 

 It is to he hoped that other collections may be received from that very 

 interesting region, both in order to complete the fauna and to afford 

 the means for the description of many species, which, in this collection, 

 are too imperfectly preserved for satisfactory description. 



GASTEROPODA. 

 Bulla, sp. iad. 



A single specimen was found, resembling Bulla Adamsii Mke., but 

 differing in the following points. Shell less convex above and propor- 

 tionally broader at the extremities. Aperture, below, also appears 

 broader than in any specimen of B. Adamsii that I have seen. Fur- 

 ther specimens may prove this to be a distinct species. The outer lip 

 is slightly broken, and hence the following measurements are only 

 approximate. Length 24-6 millim.; breadth 16'6 millim. 



Callopoma lineatum, sp. nov. 



Plate YI, figure 2. 



Shell turreted; spire elevated; whorls six (?), convex. Upper 

 whorls slightly depressed in front, marked by a few, strong, subnodu- 

 lous ridges, alternating with finer revolving lines. 



Body whorl very convex, marked above by two strong tuberculosa 

 ridges, and laterally and below by a few revolving lines, varying in 

 size, as on the upper whorls. Whole surface marked by very fine and 

 numerous longitudinal lines, rather broader than the spaces between 

 them. Aperture not observed. 



Length (4 whorls) 15-8 millim.; breadtli 13-8 millim. 



* A graduating thesis presented at the Sheffield Scientific School, Julj^, 1869. 



