253 



edge obliquely curved; 3rd pair slightly widening below, aud more than 

 twice as deep as the corresponding segment; 4th pair larger than the 2 

 preceding pairs combined, distal edge strongly curved in the middle. Last 

 pair of epimeral plates of metasome somewhat produced at the lateral 

 corners. Eyes of moderate size, rounded, pigment dark red. Antennae 

 rather slender, the superior ones considerably exceeding half the length of 

 the body, 1st joint of the peduncle much longer than the cephalon, 

 2nd joint still longer, flagellum half as long again as the peduncle, 

 and very slender. Inferior antennae in female somewhat shorter than the 

 superior, with the 2 outer joints of the peduncle nearly equal-sized, and the 

 flagellum about the length of the last peduncular joint; those in male com- 

 paratively stronger and more elongated, with the flagellum shorter. Anterior 

 gnathopoda slender and feeble, meral joint but little produced, propodos 

 somewhat shorter than the carpus, and scarcely broader. Posterior gnathopoda 

 rather powerful, meral joint simple, without any asicending lamella inside, 

 propodos in female shorter than the basal joint, triangular oval in form, gradually 

 expanded distally, palm somewhat oblique, and shorter than the hind margin, 

 from which it is defined Ijy a sharp, dentiform projection armed with 2 

 spinules, its edge nearly straight, and coarsely dentated in its anterior half, 

 more minutely in the posterior part; those of male considerably larger, with the 

 propodos produced inferiorly in the middle to a conico-acuminate process, defined 

 in front by a deep angular incision, anterior part of the palm coarsely dentated. 

 Pereiopoda much more slender than in the 2 preceding species, with the 

 meral joint far less expanded, basal joint of the 2 last pairs oblong oval 

 in form. Last pair of uropoda rather slender, basal joint about the length 

 of the other 2 combined, and armed with 4 rather coarse denticles. Telson 

 oblong oval, scarcely twice as long as it is broad, and armed with 3 pairs 

 of strong dorsal denticles, outer part tapering to a sharp point. Body 

 whitish, pellucid, with scattered dark brownish red patches; ova in the 

 marsupial pouch bluish. Length of adult female mm, of male about 

 the same. 



Remarlcs. — I have formerly confounded this form with that named 

 by me as M. hormJis. Only the habitus figure given in my «Oversigt» refers 

 to the latter species, whereas the figure of the 2nd gnathopod belongs to the 

 present species. The form described by Boeck as 31. Bru.telii, appears to 

 be this species, and is very different from that so named by Goes, which 

 will be described and figured in the sequel. The comparatively slender and 

 elongated antennae and pereiopoda, as also tlie structure of the posterior 

 gnathopoda in the two sexes, will suffice to distinguish this species from 

 its nearest allies. From the 2 preceding species it is moreover at once 



32 — Crustacea. 



