268 



pair much narrower tliau in 71/. Solsberc/i, with the anterior edge evenly 

 curved and the tip narrowly rounded; 3rd pair fully twice at deep as the 

 corresponding segment, and somewhat obliquely truncated as the tip; 4th 

 pair considerably larger than the 2 preceding pairs combined, and broader 

 than they are deep, distal edge but very slightly curved, posterior extremity 

 evenly rounded off Last pair of epimeral plates of metasome ratlier produced 

 at the lateral corners. Eyes not very large, rounded, pigment bright x-ed. 

 Antennae comparatively short, the superior ones scarcely exceeding in length 

 the third part of the body, 1st joint of the peduncle about the length of 

 the cephalon, bi;t somewhat shoi'ter than the 2 succeeding joints combined, 

 flagelluni scarcely as long as the peduncle, and composed of about 9 articula- 

 tions. Interior antennae about the length of the superior, the 2 oixter joints 

 of the peduncle nearly equal-sized, flagellum .scarcely exceeding the length 

 of the last peduncular joint. Anterior gnathopoda of normal appearance, 

 meral joint produced at the end inferiorly to a distinct setiferous projection, 

 propodos about the length of the carpus, bixt scarce^ as broad, somewhat 

 tapering distally, and armed on the inferior edge with a single denticle 

 about in the middle. Posterior gnathopoda comparatively feeble in structure, 

 carpus produced at the end inferiorly to a rather large rounded lobe, densely 

 setiferoiis at the tip, propodos ratlier narrow, oblong quadrangular in form, 

 and slightly dilated distally, palm rather oblique, but shorter than the hind 

 margin and defined from the same only by an obtuse angle, its edge nearly 

 straight and quite smooth. Pereiopoda less strongly developed than in M. 

 Solsbergi] last pair with the basal joint much broader, and oval quadrangular in 

 form, meral joint not very much expanded, and prodiiced somewhat beyond the 

 middle of the carpal_ one. Last pair of uropoda with the basal joint shorter 

 than the other 2 combined, and armed with only 2 small denticles. Telson 

 quite unarmed, and very narrow, nearly three times as long as it is 

 broad, slightty constricted in front of the middle, tip obtusely pointed. 

 Colour pale greyish white, each segment having dorsally a slight 

 yellowish transversal band; ova in the marsupial pouch bluish. Length of 

 adult female 4 mm. 



Remarks. — Boeck has apparently confounded this very distinct 

 species with M. AhlerF)., from which it may easily be recognized, among other 

 characteristics, by the short equal-sized antennae, and by the very different 

 shape of the postei-ior gnathopoda. The specific name refers to the comparatively 

 feeble structure of the latter legs. 



') The figs 4 and 4 k of PI. XVH in Boeck's great work, undoubtedly belong to the pn 

 sent species, and not, as said in the text, to M. Alderi. 



