317 



defined species, though evidently congeneric. On the other hand I think Mr. 

 Schneider is right in believing the Kroyera altamarina of the same author to 

 be the same species as that described by Boeck. From P. arenarius the pre- 

 sent species is easily distinguishable by the shorter and more curved rostrum, 

 and especially by the rather different form of the chela of the posterior 

 gnathopoda, as also by the very long carpal process of the same legs. 



Occurrence. The only place, where I have met with this form, is at 

 Hasvig, west Finmark, where some specimens were collected from a depth of 

 6 10 fathoms, sandy bottom. Mr. Schneider has als found it in east Finmark, 

 at Vardo. Finally Boeck states its occurrence in the Christianiafjord and 

 at Haugesund. 



Distribution. Shetland Isles (Sp. Bate), Kattegat (Meinert), coast of 

 France (Chevreux). 



Gen. 7. Synchelidium, G. 0. Sars, n. 

 Syn. : Pontocrates, Boeck (part). 



Body comparatively more slender than in Pontocratev, otherwise of a 

 rather similar aspect. Cephalon produced in front to a more or less strongly 

 deflexed rostrum. Coxal plates of moderate size, and but sparingly setous at 

 the edges, 1st pair rather expanded distally. Eyes as in Pontocrates. An- 

 tennae rather slender, the superior ones in female longer than the inferior, 

 and having the last joint of the peduncle rather elongated. Inferior antennse 

 in male greatly elongated and slender. Anterior and posterior lips about as 

 in Pontocrates. Mandibles less strongly developed, with the molar expansion 

 very small, forming only a slight conical projection tipped with a single 

 spine, palp comparatively small, with the terminal joint in female poorly 

 developed. First pair of maxillae nearly as in the preceding genus ; 2nd pair 

 with the lobes very short and broad, the outer one transversely truncated 

 at the tip. Maxillipeds with the masticatory lobes comparatively small, and 

 only armed with a few strong spines on the inner edge. Anterior gnathopoda 

 very powerful, and somewhat resembling those in the preceding genus, but 

 having the palm coarsely dentated and the carpal process nearly bare, tipped 

 by a strong spine. Posterior gnathopoda very slender, with the carpus imper- 

 fectly defined from the propodos, the latter much elongated and narrow, 

 tapering distally, and terminating with a minute chela, the thumb of which 



