CRUSTACEA. 



only peculiarities of importance. It has the form nearly of some 

 Pilumni, yet has no ridge to the praelabial plate, excepting an obsolete 

 one over its posterior half. It is near Halimecle of De Haan, but the 

 male abdomen is only five-jointed and the last joint has not the un- 

 usual length seen in De Haan's species. The front, moreover, is not 

 so narrow. The species is very deeply areolate and not villous. 



MED^EUS ORNATUS. 



Carapax paulo transversus, profunde areolatus, areolis asperatis prceci- 

 pue in parte anteriare, nee 2 M nee 3 M subdivisd, margine antero 

 laterali 5-Q-dentato, dentibus D, d, E, N, T, /S designatis, scabris, 

 orbitd 4 dentibus circumdatd ; fronte producto, latiore, bene emarginato, 

 lobis margine concavis. Pedes antici aspere tuberculato, manu tuber- 

 culis asperatis fere cblongis nee acuminatis armatd, digitis asperatis. 

 Pides postici pubescentcs, articulo Stio supra 



Carapax slightly transverse, deeply areolate, areolets asperate espe- 

 cially on anterior part of each, neither 2 M nor 3 M subdivided, 

 antero-lateral margin five or six-toothed, the teeth being D, d, E, 

 N, T, S, scabrous; orbit with four teeth on its margin, front rather 

 broad, produced, deeply emarginate, lobes with a concave front 

 margin. Anterior feet with rough or asperate tubercles, those of 

 the hand a little oblong, not pointed, fingers asperate. Posterior 

 feet pubescent, third joint spinulous along the upper margin. 



Plate 9, fig. 1 a, male, enlarged two diameters ; b, side view, showing 

 relation of orbit and antero-lateral margin ; c, front view of base of 

 outer antennae; d, outer maxillipeds; e, flagellura of outer antennae, 

 much enlarged; /, extremity of tarsus; g, one of the pectinated setae 

 of the tarsus, showing its setules. 



Dredged at Lahaina, Island of Maui, Hawaiian Group. 



Length of carapax, 5 - l lines; greatest breadth, 7 lines; ratio of 

 length to breadth, 1 : 1-37. 



The prominent areolets with an asperate surface, and the promi- 

 nent tubercles of the oblong hand, give the species a peculiarly rough 



