\66 



RICHARDSON 



are short, subequal, both together but 

 little longer than half the length of the 

 first joint. The second pair of antennae 

 extend only to the end of the second 

 joint of the fust pair. Both pairs of an- 

 tennae terminate in long hairs. 



The first thoracic segment is coalesced 

 with the head. The second segment is 

 short, the next two equal in length and 

 longer than the first. The last three are 

 subequal and the longest. 



There are five abdominal segments, 

 including the terminal one. The first 

 three are subequal in length; the fourth 

 is half as long as any of the preceding 

 ones; the terminal segment is rounded 

 posteriorly. 



The three pairs of pleopods are densely 

 setose. The uropods are single-branched, 

 each branch composed of three joints. 



The first gnathopods have the hand 

 strongly chelate and very large, the finger 

 and thumb gaping. The finger is long 

 and curved ; the thumb elongated and 

 squarely produced ; the upper surface is 



provided with two teeth, a slight depression separating them. The 



carpus is produced at the upper inner angle in a strong tubercle. 

 The first pereiopods are very small, feeble and 



almost inconspicuous; the second pair longer, but 



not quite as long as the other four pairs, which 



are equal in length. 



Description of Feviale. — Head broad at base 



and attenuated anteriorly, but not produced in a 



straight process as in the male. The anterior 



margin has a triangular median point on either 



side of which the first pair of antennae are inserted 



in the depression formed by the median point and 



the antero-lateral angles. The eyes are situated as 



in the male. The first pair of antennae are much 



shorter than those of the male. The first joint is longest, equal to one- 

 third the length of the head, the two following joints are subequal and 



Tanais stunfordi. 



Fig. 59. Tanais 

 staiifordi ; hand of 

 male. 



