283 



by Norman as L. imparicornis, which latter form will be described in the 

 sequel under the older name L. Lilljeborgii proposed by Boeck. 



1. Leucothoe spinicarpa 1 ) (Abildgaard). 



(PI. 100, PI. 101, fig. 1). 

 *iiinic<ir[ni$, Abildgaard, Zool. Danica, III, p. 66, PI. CXIX, fig. 14, 17. 



Syn. : Cancer (Gammarus) articulosus, Mont. 

 Leucothoe denticulata, Costa. 



Body rather slender, nearly cylindric, with broadly rounded back. 

 Cephalon scarcely longer than the 1st segment of mesosome, frontal projec- 

 tion very short, and obtuse at the tip, descending lamella forming inferiorly 

 a sharp corner, lateral edges of the cephalon evenly rounded off. The 4 an- 

 terior pairs of coxal plates but little deeper than the body, 1st pair somewhat 

 expanded in their outer part, anterior corner transversely truncated; 2nd pair 

 obliquely quadrangular in shape, and somewhat broader than they are deep; 

 3rd pair a little narrower, and obliquely truncated at the tip; 4th pair the 

 largest, and having the anterior corner blunted, the posterior projection obtu- 

 sely pointed. Last pair of epimeral plates of metasome but little produced 

 at the lateral corners, and nearly rectangular, posterior edge very slightly 

 curved. Eyes of moderate size, oval in form, pigment bright red. Superior 

 antennae scarcely attaining : /3 of the length of the body, 1st joint of the 

 peduncle rather elongated, exceeding the length of the cephalon, and produced 

 at the end posteriorly to an acute lappet; 2nd joint of about same length, 

 but somewhat narrower, 3rd joint very small, flagellum about the length of 

 the last 2 joints of the peduncle combined, and composed of about 16 articu- 

 lations. Inferior antennae but little shorter than the superior, but more slen- 

 der, last joint of the peduncle much shorter than the penultimate one, flagel- 

 lum very small, not even attaining the length of the last joint of the peduncle. 

 Anterior gnathopoda rather slender, proximal part of the carpus globularly 

 inflated, carpal process very narrow, spiniform and quite smooth, terminating 

 in a slightly upturned acuminate point, propodos finely serrated along the 

 inferior edge and having besides a row of small curved bristles, dactylus 

 about half its length and very slender, curved downwards. Posterior gna- 

 thopoda with the carpal process densely hairy, and somewhat laminar at the 

 tip, terminal edge minutely serrulated, propodos very large and massive, oval 



In the plates, hy an error, the specific name of Montagu, articitlosa, has been inserted. 



