ISOPODS OF KOfiTH AMEEICA. 



233 



much larger and longer than the sixth pair, being extremely long. 

 The last three pairs have the basis furnished with a low carina. 



FIG. 235. OLENCIRA PK^GUSTATOR. a, MANDIBLE, x 27}. b, MANDIBLE WITHOUT PALP, x 51}. 

 c, MAXILLIPED. x 27}. d, SECOND MAXILLA, x 27}. e, FIRST MAXILLA, x 27}. 



37. Genus CERATOTHOA Dana. 



Body oblong. 



Head but little immersed or set in the first thoracic segment. Eyes 

 small. The first pair of antennae are dilated, contiguous at the base. 

 The second pair of antennas are compressed. 



Anterior margin of the first segment of the thorax rounded. Epim- 

 era of the first thoracic segment in the female with a carina produced 

 in the form of a spoon or a tubercle and directed anteriorly. The 

 anterior epimera do not reach by a great but gradually decreasing 

 distance the posterior angle of the segment. The posterior epimera 

 almost reach or extend a little beyond' the posterior angles of the 

 segments. 



The abdomen is deeply immersed or set in the thorax. Terminal 

 segment transverse. The legs are rather long, with the exception of 

 the first and second pairs. The ungulse are long and strongly curved, 

 those of the third pair in the female being the longest of all, and 



See Schicedte and Meinert for characters of genus, Nat. Tidsskr. (3), XIII, 

 1881-83, pp. 299-300. 



