236 



S. valida of Dana, and another form described by the Rev. Mr. Stebbing 

 from the Challenger Expedition as 8. adlmrens, 6 northern species may be 

 referred to the present genus. 



1. Stenothoe marina, (Sp. Bate). 



(PL 80). 

 Montagua marina, Sp. Bate, Catal. Brit. Mus., p. 56, PI. VIII, fig, 5. 



Body moderately slender and rather compressed, with the back 

 evenly rounded. Cephalon but very slightly produced in front, lateral 

 corners rounded off. Second pair of coxal plates much smaller than the 

 succeeding pair, and somewhat sinuated posteriorly, inferior and anterior 

 edges forming together an even and rather strong curve, infero -posteal 

 corner armed with a small dentiform projection; 3rd pair somewhat expanded 

 distally, and transversely truncated at the tip ; 4th pair nearly as large as 

 the 2 preceding pairs combined, and somewhat broader than they are deep, 

 distal edge strongly curved in the middle. Last pair of epimeral plates of 

 metasome but slightly produced at the lateral corners. Eyes of moderate 

 size, rounded, with well-developed visual elements and dark red pigment. 

 Superior antennae in female nearly half as long as the body and very 

 slender, 1st joint of the peduncle about the length of the cephalon, 2nd 

 joint a little shorter and much narrower, flagellum half as long again as 

 the peduncle. Inferior antennae somewhat shorter than the superior, the 

 2 outer joints of the peduncle nearly equal-sized, flagellum considerably 

 longer than the last joint of the peduncle. Antennae in male comparatively 

 stronger and more elongated than in female. Anterior gnathopoda rather 

 feeble, meral process reaching nearly to the end of the carpus, propodos fully 

 as long as the 2 preceding joints, and somewhat expanded distally, palm 

 obliquely curved, and armed posteriorly with 3 small spinules. Posterior 

 gnathopoda in female rather powerful, propodos fully as long as the basal 

 joint, and nearly obpyriform, tapering distally, palm very oblique, occupying 

 the greater part of the length of the propodos, and defined posteriorly by a 

 slight angle bearing a slender spine, its edge somewhat irregularly dentated 

 throughout, and bearing besides small hairs, hind margin rounded off, and 

 provided with 3 4 fascicles of slender bristles, dactylus very strong and 

 curved at the base. Same legs in male much more powerful than in female, 

 propodos very large, and less dilated in its posterior part, palm less distinctly 

 defined, and having some of the outer denticles very large and tuberculiform, 

 dactylus finely hairy inside. Pereiopoda moderately slender, and edged with 



