88 
«. Maxillipeds good-sized. Genital apertures very far from each other, placed 
very near the line where the hind margin and the lateral-margin meet. Live 
in the marsupium of the genera Hrythrops G. O. 8. and Parerythrops G. O. 
Sars, belonging to Mysidacea................ V. Mysidion n. gen. 
fp. Maxillipeds wanting. Genital apertures closer together, somewhat up on the 
dorsal surface. Live attached outside on the back and on the sides of the 
body or on the eye-stalks of the genus Evythrops G. O. Sars, belonging to 
Miysidacea ae gacces aise criss eee coe .... WL. Aspidoecia Giard and Bonn. 
I. Stenothocheres n. gen. 
FEMALE. The body somewhat longer than broad; naked all over. The head which 
is comparatively good-sized, is not marked out from the trunk; it has neither frontal nor 
lateral borders. Antennule comparatively long, without distinct articulation and with few 
sete. Antenne middle-sized. The mouth-border with very short hairs. Maxillule without 
additional branch. Maxille robust, without hairs. Maxillipeds of scarcely medium size, second 
and third joints coalescent, all joints without hairs, spines or processes. Sub-median skeleton 
very feebly developed, consisting only of a plate in front of each maxilliped. The trunk-legs 
are situated rather far from the lateral margin; they are comparatively of considerable size 
and consist of a basal part with two unjointed branches, each as a rule ending in a strong 
or spiniform seta, besides, on the outer branch of the first pair of legs, is found a 
smaller seta. Abdomen pretty well developed, consisting of a robust basal part and a 
narrower distal part, which passes without articulation into two short and broad caudal 
stylets, each of which bears four sete of unequal length. Genital area wanting. Genital 
apertures situated partly on the lateral surface, partly on the ventral side of the basal part 
of the abdomen, more or less close to its lateral margin. Two large receptacula seminis, 
the entrances of which have not been found. — Spermatophores have not been noticed. 
MALE. Agrees with the female in most features, so that only some characters 
need be pointed out. The head is not marked out, it occupies about half of the body. The 
trunk-legs are situated at a short distance inside the lateral margins of the trunk; both pairs 
are comparatively very considerable, with a thick basal part. A little behind and outside 
the second pair of trunk-legs proceed a pair of spines (pl. I, fig. 21, x), which are possibly 
the rudiments of a third pair of legs. Only the narrower, distal part of the abdomen can 
be distinguished from the trunk. The body is naked, but on its dorsal side, and especially 
on its front part, it is furnished with moderately small, irregular protuberant knots, and on 
