146 GENNADAS PASITHEA. 



20. Gennadas Pasithea, n. sp. 



Station 230. Lat. 3°58' S. ; long. 128°20' E. From 

 a depth of 2000 M. to surface. 



A species related to Gennadas horealis Rathb. (Rathbun, 

 Decapod Crustaceans North West Coast of North America, 

 1904, p. 147). 



Carapace of the male, rostrum included, 12"im. long, i. e. 

 two fifth parts the length of the abdomen. Rostrum as in 

 Gen. horealis^ but shorter, reaching almost to the middle 

 of the 1st joint of the antennular- and of the eye-peduncle. 

 Rostral tooth situated just above the orbital margin. Ca- 

 rinae and grooves of the carapace and of the abdomen 

 nearly as in Gen. horealis. Branchiostegal spine minute, 

 6th abdominal somite carinate alone. 



Eye-peduncles as in this species, diameter of the cornea 

 '/i2 the length of the carapace, rostrum included. Third 

 joint of antennular peduncle appearing about twice as 

 long as the 2n<^, when seen from above. 



Antennal scale 6, St»™ long to the end of the blade, 

 3''g-times as long as broad, moderately narrowed, so that, 

 at the level of the base of the distal spine, it appears 

 still almost half as broad as at that of the greatest breadth ; 

 inner and outer margins of the scale straight, tip of the 

 blade oblique, obtuse, extending beyond the tip of the 

 distal spine farther than the spine itself is long. 



Merus of 2nd maxillipeds a little more than half as broad 

 as long, distal lobe rounded, half as long as the rest of 

 the merus. External maxillipedes and legs nearly as in 

 Gen. horealis and as in Amalop. elegans Smith, but the 

 chela of the 2nd legs in proportion to the carpus shorter 

 than in Amalop. elegans, the carpus being in the male 

 2,8™"" long, the chela 2ram., Carpus of the 3''^ legs a little 

 shorter than the merus, chela little more than half as long 

 as the carpus. 



Petasma large, symmetrical, strongly arched, as long as 

 broad, terminating distally in four lobes, viz. in two larger 

 submedian ones that are triangular, obtuse and separated 



Notes from the Leyden IMuseum, Vol. XXIX. 



