113 



Thoracic and abdominal sterna smooth, except that the 6th abdominal 

 sternum is hispid and is armed with a recurved spine between the bases of the 

 caudal swimmerets. 



Antennular peduncle not half the length of the antennal scale, its basal 

 joint is the longest and its scale has the outer edge spiny and ends in a long 

 acicle : the terminal joint also carries a spine : the flagella are longer than the 

 carapace (not including the rostrum). 



The distal border of the 2nd joint of the antennal peduncle is spinose : the 

 hispid antennal scale is nearly 4 times as long as broad and more than two-thirds 

 the length of the carapace (without rostrum) : antennal flagellum much longer 

 than the entire body. 



Except for their stout third segment the external maxillipeds are not 

 stouter than the 2nd pair of legs. 



The 1st pair of legs, which are about the same length as the external 

 maxillipeds, do not reach halfway along the antennal scale : the upper border of 

 the merus and carpus is spinulate up to a terminal spine : the palm is compressed 

 cylindrical, about 2- times as long as broad, and hardly decreases in breadth 



forwards : the fingers, which are nearly straight, are about two-thirds as long as 

 the palm. 



The 2nd pair of legs reach slightly beyond the base of the fingers of the 

 1st pair; the 3rd pair reach within a short distance of the tip of the antennal 

 scale, and are about the same length as the 4th pair ; the 5th pair reach nearly 

 a dactylus length beyond the tip of the antennal scale. 



A single female from the Andaman Sea, l\ miles east of N. Cinque I., 490 

 fathoms. 



The length of the free portion of the rostrum is 51*5 millim., of the carapace 

 28.5 millim., of the abdomen 63 millim., measured in the middle line. 



Regd. No. J (Type of the species). 



66. PsalidopUS Spiniventris, Wood-Mason. 



Psalidopus spinivetitris, Wood-Mason, Ann. Mag. Nat. Hist., April 1892, p. 273, pi. xiv. figs 3-6 pi xv 

 figs. 1-10. 



Differs from P. Huxleyi, females compared, in the following points only : 



The last 2 thoracic and all the abdominal sterna are armed with a median 

 vertical needle-like spine. 



The 2nd pair of thoracic legs reach to the tips of the fingers of the 1st pair. 

 The rostrum may be more than twice the length of the rest of the carapace. 

 Colour in life, pink with white points. 

 15 



