GENNADAS CLAVICARPUS. 145 



the gastrofroutal furrow runs iu the direction of that tooth, 

 Postrostral carina interrupted on the short interspace be- 

 tween the well-cut gastric and cervical grooves, rather 

 sharp in front of the gastric sulcus. 



Eye-peduncles flattened, with large, acute, conical tubercle, 

 cornea dark red brown. Third joint of antennular peduncle 

 somewhat longer, but less broad than the 2°d. Antenual 

 scale measuring two thirds the length of the carapace, 

 rostrum included, extending beyond the antennular pedun- 

 cle almost by the length of the 3^^ joint; it narrows 

 rather strongly, the inner margin is straight and the ter- 

 minal spine exceeds the blade as far as the obtuse tip of 

 the latter is broad. 



Second and third maxillipedes as in Amalopenaeus ele- 

 gans Smith (Bull. Museum Comp. Zool. X, N». 1, 1882, 

 PI. XV, fig. 5), but the carpus appears claviform, 

 being considerably thickened distally, the thickness 

 here being just one third the length of the joint. 



Legs of the l^t and 2"'^ pairs much as in Amalop. ele- 

 gans, but the carpus has a stouter shape, that of the 

 1st being 2^/2-times as long as broad, that of the 2^'^ S'/g- 

 times. Carpus of the 3'"'^ pair slightly longer than the merus. 



Petasma symmetrical, each leaf terminating on the dis- 

 tal margin in a larger rounded lobe near the median line 

 of the organ and in two narrow teeth or spines, of which 

 that at the outer angle of the margin is much smaller 

 than the other, which is sharp and curved foreward ; there 

 are moreover two small tooth-like lobes on the anterior 

 surface of the organ. 



Thelycum consisting of a trapezoidal, upstanding plate 

 or tubercle, between the legs of the 3^^^ pair, nearly as 

 long as broad at the base and terminating anteriorly in 

 two small teeth ; this tubercle is followed by three horizon- 

 tal plates, of which the two anterior, between the legs of 

 the 4th pair, are broad, the posterior one, between the coxae 

 of the 5tli pair, rather narrow, slightly longer than broad. 



Length of male 27'^^; of female 34ram.. 



Notes from the Loyden JMuseum, Vol. XXIX. 



10 



