GENUS CAMPASCUS— CAMPASCUS COENUTUS. 205 



CAMPASCUS CORNUTUS. 



Plate XXXIV, figs. 17-24. 

 Campascus cornutus. Leidy : Proc. Acad. Nat. Sci. 1877, 294. 



Shell retort-form, with a short curved neck, and with the obtuse fundus 

 directed backward and upward, and provided on each side with a divergent 

 conical prolongation; composed of translucent, yellowish, homogeneous, 

 chitinoid membrane, incorporated with scattered sand particles. Mouth 

 circular, directed downward, bordered by a delicate, colorless, annular- 

 expansion. The interior soft part resembling that of Cyphoderia; a large 

 nucleus at the fundus; pseudopods filamentous, furcate, exceedingly deli- 

 cate. 



Size. — Ranging from 0.112 mm. to 0.14 mm. long by 0.18 mm. broad, 

 or between the lateral processes of the fundus from 0.08 mm. to 0.-112 mm. 

 broad; mouth 0.024 mm. to 0.028 mm. wide. 



Locality. — The ooze of China Lake, Uinta Mountains, 10,000 feet 

 altitude, Wyoming Territory. 



Campascus cornutus is intermediate in character to Centropyxis 

 aculeata and Cyphoderia ampulla. The shell has the structure and horn-like 

 processes of the former ; but the shape and the structure of the animal, with 

 the pseudopods, have the character of the latter. 



This animal I discovered in August, 1877, in ooze collected in China 

 Lake, in the Uinta Mountains, about 25 miles from Fort Bridger, Wyo- 

 ming Territory. I have not found it elsewhere. I at first took it for a new 

 species of Cyphoderia; but I failed to detect the hexagonal structure char- 

 acteristic of the shell of this genus. 



In the side view of Campascus, as seen in fig. 21, pi. XXXIV, the 

 shell has the exact form of that of Cyphoderia ampulla, the lateral processes 

 being concealed. Either in the under or the upper view, as seen in figs. 

 17, 20, the lateral prolongations backward of the shell give it a triangular 

 outline, in which the mouth forms the apex, the processes form the basal 

 angles, and the intermediate portion of the base forms the rounded fundus. 

 The lateral processes are conical and curved, and are on the ventral rather 

 than on the dorsal aspect of the fundus. In some specimens, as seen in that 

 of fig. 22, it is rudimental, and in this particular one also the summit of the 

 fundus was somewhat pointed. 



