ludidU Dcep-sed Dredijliuj. 2G9 



straight or very slightly concave lines to the tiiangiilar apex ; 

 its dorsal surface, which is covered with a furry coating of 

 minute aj)|)rcssed spinules, is transversely convex and tra- 

 versed longitudinally by a deep groove, while its ventral 

 surface is deeply excavated gutter-like and glabrous. 



'J^he eyc-j)edunck's are very small and imiTiovably re- 

 tracted outwards against the extraorbital angle, being aiikv- 

 losed at base to the oplithalmic sternum ; a distinct con- 

 striction limits off a wider and almost spherical apical or 

 corneal portion from a narrower basal portion ; the latter 

 bears on its inner and inferior side, near tlie base, a minute 

 papilla; the corneal portion is smooth and polished, and does 

 not exhibit the slightest trace either of superficial faceting or 

 of subjacent [)igmentation ; the eyes appear, in fact, to be in 

 exactly the same degenerate condition as those of Nephropsis 

 Stewarti, and it is certain can be capable at most of aj)pre- 

 ciating differences in the intensity of the light. 



The peduncle of the antennules is subcylindrical ; its first 

 joint is about equal to the two remaining joints taken 

 together, crested on the infero-internal margin, the crest 

 running into an acicidar spine some distance from the apex, 

 and produced at its outer base into an oval digitate scale-like 

 process ; the second and third joints subequal, the latter 

 armed with an acicnlar spine about the middle of its extero- 

 superior face ; flagella equal in length, the outer the thicker 

 (much the thicker in t;^), and bearing olfactory filaments to 

 within a short distance of its extremity. 



The second joint of the antenna is armed with three spines 

 on the outer apex ; the scale is a narrow, firmly chitinized, 

 oblong plate, with an acute triangular somewhat inturned 

 point ; it is strengthened and stiffened not only by its greatly 

 thickened outer margin, which terminates some distance 

 from the apex of the part in a prominent spine, but also by a 

 stout midrib and a slight thickening of the apical and inner 

 margins. The flagellum is very long. 



The mandible is very distinctly divided into molar and 

 incisive processes by a deep and almost rectangular notch, in 

 which the palp is lodged. The incisive process is a thin, 

 excessively sharp, and slightly recurved knife-like plate. 

 The stout molar process may be described either as an irre- 

 gular four-sided prism with one angle broadly rounded off or 

 as an irregular three-sided prism with one side convex ; its 

 trapezoidal or subtriangular masticatory surface is concave 

 with sharp edges. The palp is robust, two-jointed ; tiie 

 apex, with the greater part of the inwardly directed outer 

 edge of its oval terminal joint, is beset with stiff seta3. 



