130 



STALK-EYED CRUSTACEA. 



of small spines on the dorsal ribs of the telson, and sometimes the rudiment 

 of a third pair near the tip. 



The thoracic sterna are armed with two median spines, one of which is 

 situate on the somite which normally bears the second pair of legs, the 

 other on the following somite. 



The sternum of the first to the fifth somites of the abdomen bears a long 

 spinous median tooth, while the sixth somite is armed with a pair of smaller 

 spines on the anterior margin of the sternum. 



The eyes are of moderate size, black, and situated on short, rather stout 

 peduncles. 



The first segment of the antennular peduncle is long, enlarged proxi- 

 mally, and furnished with a rounded external plate at the proximal end ; it 

 is thickly clothed with hairs on its inner margin. The second segment is 

 shorter, more nearly cylindrical, and is likewise furnished with hairs along 

 its inner and inferior margin. The third segment is much shorter than the 

 second, and bears two flagella, the outer of which is about twice as long 

 as the inner, much broader, and composed of about twenty-two flattened 



segments. 



\ 



The peduncle of the antenna considerably overreaches the antenna! 

 scale, and is of nearly the same length as the antennular peduncle. The 

 antennal flagellum is about equal in length to the whole body. 



The third maxillipeds are long and pediforra, surpassing the antennal 

 peduncle when directed straight forward. The terminal segment is some- 

 what flattened, but not enlarged. 



The chelipeds are of moderate length, reaching forward slightly beyond 

 the peduncle of the antennae; there is a spine on each side of the distal 

 end of the carpus, and another long and acute one at the antero-intcrnal 

 angle of the propodite. Of the second pair of legs there is no trace. ' The 

 third pair is very slender and longer than the first pair. The fourth and fifth 

 pairs are more robust than the third pair and also longer, the fifth pair sur- 

 passmg the fourth. They terminate in a curved and very sharp dactylus. 



The abdominal appendages are biramose, the inner branch being well 

 developed and subequal to the outer branch, except in the first pair, where 

 it is very small in both sexes. In the male the inner branch of the second 

 pair carries a stylamblys on its internal margin. The terminal pair is much 

 sliorter than the telson. 



Length of a female from tip of rostrum to end of telson, 85 mm. ; length 



