556 



developed, attaining about half the length of the peduncle, and 6-articulate. 

 Inferior antennae somewhat shorter than the superior, the last 2 joints of the 

 peduncle of nearly equal length, flagellum shorter than those joints combined. 

 Anterior gnathopoda (in female) rather slender, with the basal joint some- 

 what expanded, and densely fringed anteriorly with comparatively short 

 bristles, ischial joint expanded posteriorly to a rounded, densely hispid lobe, 

 propodos about the length of the carpus and scarceU^ broader, with the palm 

 somewhat oblique, and defined below bv an obtuse angle, dactylus of moderate 

 length. Posterior gnathopoda more elongated than the anterior, basal joint 

 laminarly compressed, and narrow siibfusiform in outline, with the anterior 

 edge clothed by a double row of very long ciliated setae, carpus much 

 elongated, and connected with the propodos by an oblique articulation, 

 propodos scarcely half the length of the carpus, and gradually tapering 

 distally, dactylus comparatively small. The 2 anterior pairs of pereiopoda 

 with the basal joint somewhat laminar and qviite smooth, meral joint widening 

 distally, and about the length of the carpal joint, propodal joint extremely 

 narrow, and much longer than the carpal one, dactylus scarcely more than 

 Vs as long as the former, and very slender. Antepenultimate pair of 

 pereiopoda comparatively stout, with the basal joint irregularly oval in form, 

 its anterior edge being gently curved, the posterior one slightly sinuated and 

 somewhat expanded at the base, propodal joint shorter than the carpal one, 

 dactylus extremely small. Last pair of pereiopoda very much elongated, equalling 

 in length ^s of the body, basal joint oblong oval in form, and, like that of 

 the 2 preceding pairs, having the posterior edge densely fringed with ciliated 

 setae, propodal joint much elongated and armed along the anterior edge with 

 a row of short spines, dactylus small, bidentate at the tip. The 2 anterior 

 pairs of uropoda unusually strong. 1st pair with the basal part produced at 

 the end anteriorly to a strong spiniform process; 2nd pair with the basal 

 part short and broad, rami extremely stout, and each armed with a double 

 row of very strong blunt spines; last pair very small, rami somewhat longer 

 than the basal part, and conically tapering, each being provided, in addition 

 to the spines, with several slender bristles. Telson short and broad, some 

 what angular on each side of the tip, and having just within the angle a 

 slender spine. Colour in the living state of the animal not yet stated. 

 Length of adult female 8 mm. 



BemarJcs. — The present form was first described in the year 1844 

 by Zaddach as the type of his genus Leptocheirus. The same form has sub- 

 sequently been recorded under "2 other names, viz, by Sp. Bate as Frotomedeia 

 Mrsufimana, and by Malm as Boeckia typica. It may be easily recognized 

 from our other Photidce by the great development of the 2nd pair of coxal 



