i2o DISCOVERY REPORTS 



Description. Head with a small notch between two short subacute points at the antero- 

 inferior angle. Peraeon segments 1-6 dorsally smooth; segment 7 with a pair of short 

 dorsal processes, flanked by a smaller dorso-lateral tooth. Postero-inferior angles of 

 segments 1-4 rounded, of 5 subacute, of 6 and 7 produced backwards in a small (seg- 

 ment 6) or large (segment 7) point. Peraeon segments not imbricate below. Side-plates 

 1-3 rounded below, 4 subacute below, lower margin not deeply excavate; 5-7 ending 

 behind in small points, largest on 7. Pleon segments 1-3 each with a pair of dorsal 

 processes, flanked on segments 1 and 2 by a smaller tooth, and a strong medio-dorsal 

 carina which ends posteriorly in a more or less acute tooth; segment 4 with a slight 

 dorsal depression ; lateral margins of segments 1-3 with a more or less upturned tooth ; 

 postero-inferior angles of segments 1 and 2 also with an upturned tooth ; dorso-lateral 

 keels on segment 6 ending bluntly. Telson ovate-oblong, slightly incised, lobes rounded. 



Fig. 67. Iphimediella nodosa (Dana), a. General view, b and c. Right and left 

 mandibles respectively, d. Telson. 



Antenna 1, 1st joint with two very short teeth on inner distal margin, 2nd joint also 

 with one very short tooth on inner upper apex. Upper lip longer than broad, incised, 

 but not deeply (not so deeply as the telson). Mandible, cutting edge with numerous 

 graduated teeth, secondary cutting-plate in left mandible only, broad, multidentate, no 

 spine-row or molar (cf. Delia Valle, pi. lviii, fig. 89). Maxilla 1, palp rather strong 

 (cf. Delia Valle, pi. lviii, fig. 90). Maxilliped, 2nd joint of palp slightly expanded 

 distally, but scarcely produced (cf. pacifica, Stebb., 1S88, pi. lxxi, or 1906, fig. 55). 



Peraeopods 3-5, 2nd joints broadly expanded, hind margin with a short point at 

 upper angle, and a stronger one at lower angle in peraeopod 5, but only a mere indication 

 in peraeopods 3 and 4. 



Uropod 2, outer ramus two-thirds length of inner ramus. 



Remarks. This specimen reopens the question of the identity of echinata, Wlkr., 

 nodosa, Dana, and nodosa, Stebb. In spite of the complete absence of denticles on peraeon 

 segments 4-6, and the absence of a lateral carina (imbrication) even on segments 5-7, 



