318 



does not exceed the dactylus in breadth, carpal process completely coalesced 

 with the propodos in its proximal part, only its tip being well defined and 

 projecting beneath tlie chela. Pereiopoda, uropoda and telson nearly as in 

 Pontocrates. 



Bcniarkfi. — I have found it necessary to establish this new genus, in 

 order to include some species formerly referred to the preceding genus, but 

 materially differing in some essential characteristics, thus, in the structure of 

 the mandibles and that of the posterior gnathopoda. The genus comprises 

 as yet 3 species, to be described in the sequel. 



20. Synchelidium brevicarpum (Sp. Bate). 



(PI. 112, fig. 1). 

 Krbyera hrcvkarpa, Sp. Bate & Westwood, Brit, sess. eyed Crust. Vol. If, Ajipeiidix, p. 508. 



Body somewhat slender, but with broadly-rounded back and the segments 

 sharply defined. Cephalon nearly attaining the length of the first 3 segments of 

 mesosome combined, rostrum rather short and evenly curved, scarcely extending 

 beyond the middle of the basal joint of the superior antennae. First pair of 

 coxal plates considerably expanded in their oiiter part, distal edge straight; 

 4th pair of moderate size, about as deep as the corresponding segment, distal 

 edge evenly curved, infero-posteal corners but little produced; 5th pair somewhat 

 broader but less deep. Eyes rather large, rounded, placed in the usual manner, 

 pigment bright red, with a whitish coating. Inferior antennae in female very 

 slender, and more than twice as long as the cephalon, the 2 first joints of the 

 peduncle almost of equal length, 3rd but little shorter, flagellum much shorter 

 than the peduncle, and composed of 5 articulations only; those in male, as 

 usual, more strongly built than in female, having the 2 outer joints of the 

 peduncle much shorter and thicker, and the flagellum fully as long as the 

 peduncle, with the 1st joint very large and densely clothed with sensory 

 hairs. Inferior antennae in female much shorter than the superior, the last 2 

 joints of the peduncle nearly equal-sized, flagellum about the length of those 

 joints combined; same antennae in male very much elongated, nearly attaining 

 the length of the whole body. Anterior gnathopoda rather strong, basal joint 

 not attaining the length of the other joints combined, propodos considerably 

 dilated on tlie middle, nearly fusiform in oiitline, palm rather arched and 

 much longer than the hind margin, from which it is defined by a distinct 

 angular projection bearing a strong spine, its edge divided into several coarse 

 denticles, 6 of which are rather large and blunted at the tip, carpal lobe 



