105 

 Gen. 23. LeptOHiyzOn, Or. 0. Sars, ri. 



Syn: Collocheres, A. Scott (part). 



Generic Characters, Body slender, with the anterior division very little 

 dilated. Cephalic segment with the inferior edges considerably curved in front; 

 rostral projection very slight and obtuse at the tip. Epimeral plates of the 

 succeeding segments rounded off. Tail very slender, and composed in female of 

 4 well-defined segments; genital segment without any lateral projections. Caudal 

 rami somewhat produced, though far less slender than in the 2 preceding genera, 

 outer seta more or less remote from the apex, dorsal bristle, however, occupying 

 its usual place near the end of the ramus. Anterior antennae slender, with the 

 full number of articulations. Posterior an term se resembling in structure those in 

 Collocheres. Oral cone short and stout, carrying at the obtuse apex 2 remark- 

 able diverging tentacular appendages, apparently attached to the posterior lip. 

 Mandibles rather strong, with the apex distinctly denticulate, palp small, con- 

 sisting of a narrow cylindrical joint, carrying on the tip a ciliated seta. Maxilla? 

 with the inner lobe well developed and furnished at the end with 4 rather strong 

 setae; outer lobe much narrower, but of about the same length, and provided with 

 only a single apical seta. Maxillipeds with the dactyli extremely slender, that of the 

 anterior ones distinctly biarticulate. Natatory legs well developed, with the rami 

 comparatively broader than in Collocheres : their armature about as in that genus. 

 Last pair of legs distinctly biarticulate, proximal joint forming inside a lingui- 

 form expansion, distal joint rather large, oblong, and extending backwards along 

 the genital segment. 



Remarks. The present new genus is established to include the form 

 described by A. Scott as Collocheres elegans. This form, it is true, exhibits some 

 characters in common with the type of the genus Collocheres, but differs in other 

 particulars so materially, that in my opinion it ought to be kept apart as the 

 type of a distinct, though nearly-allied genus. The chief differences are found 

 in the structure of the oral cone, the last pair of legs and the caudal rarni. In 

 addition to the type species described below, the form recorded by A. Scott 

 from Ceylon as Collocheres Giesbrechti is undoubtedly referable to the present genus. 



61. Leptomyzon elegans, (A. Scott). 



(PI. LXV). 



Collocheres clegans, A. Scott. Report for 1895 of the Lancashire Sea-Fisheries Lahoratoritmi. 



p. 52, PL V, figs. 615. 



Specific Characters. Female. Body exceedingly slender and elongated, 

 with the anterior division oblong fusiform in outline, greatest width scarcely 



14 Crustacea. 



