igoS.] 



Records of the Indian Museum. 



321 



This form resembles C. luna. Ehrenberg, but differs from it in 

 the following points: (i) the dorsal plate of the lorica is narrower 

 in front than the ventral; (2) the occipital edge is not inangulated; 

 (3) the horns of the pectoral edge are not so prominent ; (4) there 

 is no posterior inangulation of the dorsal plate. 



Pig. 5. 



Fam. Anur^id^. 



17. Notholca scaphula, sp. nov. (fig. 6). 



Specific characters. — Shape viewed from the dorsum^ broad oval 

 truncated at the head ; viewed from the side it is horn-shaped. 

 Lorica of two dissimilar plates, the dorsal broader than the ventral, 

 projecting in two thin wing-like lateral expansions beyond the 

 latter. Occipital margin with six spines, the two central sharpest 

 and highest, sublateral lowest. Pectoral margin with a deep 

 rounded midventral incisura bounded by two fiat spines. Dorsal 

 plate 20 — 24 striae ; ventral plate 10 strise. 



Corona. — The outer ring of ciHa passes ventrally into the in- 

 cisura of the pectoral edge, while dorsally it reaches well in front 

 of the tips of the spines. Inside the ring are three dorsal projec- 

 tions bearing large cilia. 



Trophi— Teeth, three. 



Eye single^ immediately anterior to the mastax. 



