477 



(Heller), Mediterranean at Naples (Costa), Cherchal (Chevreux) and Goletta 

 (the author), Azores (Barrois). 



8 Dexamine Thea, Boeck. 



(PI. 168, fig. 1). 



Dexamine Thca, Boeck, Crust, amph. bor. & arct. p. 107. 

 Syn. : Dexamine tenuicornis, Sp. Bate (not Rathke). 



Body of still shorter and stouter form than in the type species, 

 with boldly curved back, and the segments of metasome and urosome produced 

 in a manner similar to those in that species. Cephalon with a very short 

 rostral projection, lateral corners exserted to a very small, somewhat deflexed, 

 acute lappet. Coxal plates nearly as in D. spinosa, though perhaps somewhat 

 deeper, the 4th pair considerably exceeding in depth the corresponding 

 segment. Last pair of epimeral plates of metasome produced at the lateral 

 corners to an acuminate projection, somewhat shorter than in the said species. 

 Eyes comparatively smaller and oval in form, placed close to the anterior 

 edges of the cephalon. Superior antennae exceeding half the length of the 

 body, 1st joint of the peduncle without any dentiform projection at the end, 

 and considerably shorter than the 2nd, last joint about 1 /a as long as the 

 latter, flagellum. not quite twice the length of the peduncle, and composed of 

 16 articulations only. Inferior antennae (in female) much shorter than the 

 superior, the last 2 joints of the peduncle nearly equal sized, flagellum but 

 little longer than the peduncle. Gnathopoda resembling in structure those 

 in the preceding species, though less richly setous, and having the 

 basal joint comparatively shorter. The 2 anterior pairs of pereiopoda likewise 

 of much the same appearance as in that species. The 3 posterior pairs 

 having the outer 2 joints about of equal length, and the dactylus very strong 

 and recurved; basal joint of antepenultimate pair somewhat less expanded than 

 in D. spinosa, with the infero-posteal corner angular; that of penultimate 

 pair very broad in proportion to its length, nearly cordiform, with the 

 posterior edge bulging out considerably in the middle, and finely serrated; 

 that of last pair not at all expanded, and linear in form. Branchial lamellae 

 simple. Last pair of uropoda with the rami twice the length of the basal 

 part, and rather narrow, each terminating in a sharp point. Telson scarcely 

 extending to the tip of the latter, and not quite 3 times as long as it is 

 broad, cleft extending nearly to the base, terminal lobes each carrying one 

 apical and 3 lateral spines, and in addition 2 subdorsal ones. Body semipellucid, 



