537 



o(> Iduriella aeqvicornis, (T. <). Sars. 



(PI. 190). 

 Lilljeloryia (eqvicornis, G. O. Sars, Prodromus Crust. & Pycnog. Exp. Norvegic;u No. 103. 



Body moderately slender and rather compressed, with the 2nd segment 

 of metasome produced dorsally to a small dentiform projection, the back 

 being otherwise evenly rounded throughout. Cephalon nearly as long as 

 the first 2 segments of metasome combined, rostral projection small, lateral 

 corners rather produced and narrowly rounded at the tip, postantennal ones 

 very slight. Anterior pairs of coxal plates nearly twice as deep as the 

 corresponding segments, 1st pair very much expanded, especially in the male, 

 with the terminal edge evenly rounded and, like the 2 succeeding pairs, 

 provided at the infero-posteal corner with a small dentiform projection; 4th 

 pair very large, angular, and deeply emarginated posteriorly in their upper 

 part. Last pair of epimeral plates of metasome produced at the lateral 

 corners to a small, upturned dentiform projection; posterior edge strongly 

 curved in the middle, and quite smooth. Eyes consisting on each 

 side of a small, somewhat oval patch of a whitish pigment, without any 

 trace of visual elements. Superior antennae somewhat exceeding V* of the 

 length of the body, 1st joint of the peduncle scarcely longer than the other 

 2 combined, flagellum about the length of the peduncle, and composed of 

 about 12 articulations, accessory appendage not attaining half the length 

 of the flagellum, and composed of 5 articulations. Inferior antennae scarcely 

 as long as the superior, last joint of the peduncle a little shorter than the 

 penultimate one, flagellum not attaining the length of these joints combined. 

 Anterior gnathopoda in female with the basal joint somewhat fusiform in 

 outline, and setous on both edges, propodos very large and expanded, fully 

 as long as the basal joint, and gradually dilated distally, palm nearly 

 transverse, and slightly curved, being defined below by a distinct angle 

 carrying 2 unequal spines, dactylns slender and curved. Posterior gnathopoda 

 of a similar structure to the anterior, but having the propodos a little smaller. 

 Anterior gnathopoda in male exceedingly large, propodos longer than the 

 remaining part of the leg, and produced below to an acuminate projection, 

 its outer part gradually tapering distally, palm distinctly concave, and 

 produced in front to a small dentiform lobe, dactylns exceedingly slender and 

 much curved. Pereiopoda rather slender, the 3 posterior pairs successively 

 increasing in length, and having the basal joint much expanded and oval in 

 form, last pair exceeding half the length of the body, propodal joint a little 



