Indian Deep-sea Dredfjinrj. 407 



again is sliglitly cleft at tlic tip, and in the cleft is to be seen 

 projecting the roof of the remarkably prolonged buccal 

 cavity. 



The external orbital angle, which is somewhat ventrad in 

 position, also forms a projecting tooth, so that the orbito- 

 frontal region, which is sharply delimited from the rest of the 

 inflated carapace, has the form of a five-pronged crest or 

 crown. Tiie regions of the carapace are plainly delimiteil, 

 excepting only in the case of the boundary between the 

 gastric and cardiac regions. The pterygostomian regions are 

 most remarkably puffed out. 



Tiie abdomen (in the female) is large, and the terminal 

 segment has the form of a broad semicircular plate, broader 

 than any of the other segments and nearly as long as all of 

 them put together. 



The orbits are capacious, but tlie eye-stalks are slender 

 and the eyes are unpigmented and semiopaque. 



Tiie antennules, which are much larger and longer than 

 the antenna?, are inca])able of flexion beneatli the front. 



Tiie external maxillipeds are of great length, in correspon- 

 dence witii the remarkable trough-like prolongation of the 

 buccal cavity, which they completely close in below ; their 

 meropodite, which is prolonged far beyond the insertion of 

 the palp, covers the bases of the antennules and antennaj, 

 their tips in fact being visible from above; the slender 

 exopod does not much surpass the ischium. 



The chelipeds are short but massive, and are equal ; the 

 merus is curved, the carpus is very small, the palm is large, 

 tumid, and crooked, and the fingers are broad, compressed, 

 jjointed, very closely apposable, and have their cutting-edge 

 very finely denticulated. 



The second and third legs are of great length, being more 

 than four times tiie length of the body, the merus forming 

 more than half their extent ; their dactyli are filiform and are 

 not much longer than their protopodite. The fourth and fifth 

 legs have the family position, but are mere rudiments, being 

 of hair-like tenuity and only about three fourths of the cara- 

 pace in length ; the fiftli ends in a hook-like dactylus. 



A female from Station 116, 405 fathoms, has the following 

 dimensions : — Length of carapace 6*5 millim., breadth 6'5 

 millim., length of cheliped 9 millim., length of second leg 

 28*5 millim., of fourth leg 4*5 millim. 

 ^ Colour in the fresh state chalky pink. 



