459 



emaigin;ited posteriorly in their upper part. Eyes imperfectly developed. 

 Antennas slender and elongated, tlie superior ones being much the longer, 

 and having no accessory appendage. Buccal area rather projecting. Anterior 

 lip rounded; posterior lip rather large, and without any inner lobes. Mandibles 

 strong, with the cutting part greath' produced and coarsely dentated, secondary 

 lamella present only on the left mandible, molar expansion large and massive, 

 palp of moderate size. First pair of maxillae with the masticatory lobe not 

 verj' large, basal lobe rather broad, and edged with numerous ciliated setae, 

 palp not at all expanded distally. Second pair of maxillfe with both lobes 

 well developed and densely setous at the tip. Maxillipeds not verj' large, 

 basal lobes of normal appearance, masticatory lobes scarcely as large as the 

 latter, palp comparatively small. Gnathopoda extremel}' slender, and rather 

 unequal in length, the posterior ones being raucli the longer, propodos in both 

 pairs extremely nai'row, nearly linear in form, with the palm very short and 

 transverse. Pereiopoda slender and elongated, the 3 posterior pairs succes- 

 sively increa.sing in length, and having the basal joint laminarly expanded. 

 The 2 anterior pairs of uropoda of normal structure; last pair having the 

 basal part quite short, and the rami rather unequal, the inner one being miich 

 the larger, both mucroniform in shape, and edged with small spinules. Telson 

 comparatively broad, and somewhat navicular in shape, the upper face being 

 hnllowed, and the lower face keeled longitudinalh'. 



Bemarlis. — The present new genus is founded upon the form described 

 Iw Boeck as Amphilhopsis longimana. It is obvious that this form cannot 

 properly be regarded as congeneric with AmjjhitJiopsis longicaudata of the same 

 author, and, as it moreover, differs in some points very markedty, from 

 the other known genera, I have felt justified in regarding it as the type of a 

 distinct genus. The generic name here proposed refers to the extremely 

 slender form of the gnathopoda. In the strui'ture of the telson and the last 

 pair of uropoda, the genus strongly resembles the Parampldtlmdcc, and perhaps 

 both tliis and the preceding genus, should, in spite of the non-bilobular 

 anterior lip, be more pi'operly referred to that family than to the CaUiopiidcB. 

 The genus comprises as yet but a single species, to be described below. 



13. Leptamphupus longimanus (Boeck). 



(PI. 162) 

 Ani])hit}iopsis longimana, Boeok, Cnist. iuiii)h. bov. & aict. p. 120. 



Body slender and elongated, with the back evenly rounded througliout. 

 Ceplialon about the length of the first 2 segments of mesosome combined, 



