silttrim:. 141 



1. Rita crucigera. 



Hab. Bengal. Grows to three or four feet in 

 length. 



Char. Upper surface of the head granulated, 

 with two bony shields on the back, in front of the 

 dorsal fin, the foremost haying somewhat the shape of 

 a cross, the hinder one of a heart shape. 



A bony humeral process, above the pectoral fin, 

 which is nearly as long as the head, and terminating 

 in a rounded point. Dorsal spine very large, smooth 

 on the edge. Pectoral spine strong, serrated on both 

 edges. 



2. Eita ritoid.es. 1 foot. 



This is perhaps identical with the first species. 

 Char. Humeral process about as long as the head. 



3. Rita pavimentata. 



Hab. Southern India. 9 inches. 



Char. Upper surface of the head covered with 

 skin. 



Humeral process three-fifths as long as the head, 

 sharply pointed behind. Dorsal spine finely serrated. 

 Pectoral spine strongly toothed on both sides. 



• 



4. Rita hastata. 



Char. No apparent difference between tins and the 

 preceding species. Head smooth above. 



