Parajassa, JVIicrojassa 651 



Pleopods, rami with 5 joints. Uropod 3, peduncle broad, not twice as long 

 as rami; outer ramus the shorter, with 2 minute spines at its slightly bent 

 tip; inner ramus with a rather larger apical spine. Telson as broad as 

 long, rounded triangulär, with a small projection and adjacent setule at 

 each side of the apical ti-iangle. L. about 3 mm. 



South- Atlantic (Tristan da Cunha). Depth 201 m. 



3. Gen. Microjassa Stebb. 



1899 Microjassa (Sp. un.: Podocerus cumbrensis), T. Stebbing in: Ann. nat. Hist., 

 ser. 7 V. 3 p. 240. 



Like Jassa (p. 652), except in regard to side-plates, antenna 2 and 

 maxillipeds. Side-plates 2 — 4 much deeper than the rest, 4*^ large, emarginate 

 behind for the small 5*^. Antenna 2 but little stronger than antenna 1. 

 Maxillipeds, outer plates scantilv armed. As in Ischyrocerus (p. 657) gnathopods 1 

 and 2 of 9 little unequal, but gnathopod 2 of d much larger than gnathopod 1, 

 and differing in shape as well as size from gnathopod 2 of Q . 



1 species. 



1. M. cumbrensis (Stebb. & D. Roberts.) 1891 Podocerus c, T. Stebbing & 

 D. Robertson in: Tr. zool. Soc. London, v. 13i p. 38 t. 6b | 1895 P. c, A. O. Walker in: 

 P. Liverp. biol. Soc, v.9 p.316 | 1899 P. c, Microjassa, T. Stebbing in: Ann. nat. Hist., 

 ser. 7 V.3 p.240 | 1893 P. falcatus (part.), P. anguipes (part.)?, A.DellaValle in: F.Fl. 

 Neapel, v. 20 p. 445, 944. 



Head, rostrum small, blunt; lateral lobes obtusely pointed. Side-plate 1 

 very small, almost concealed by the rauch larger and deeper 2*^; 3^ and 

 4*^ as deep as 2"^ and much broader; 4*^ of equal breadth and depth, with 

 shallow emargination behind; 5*^ — 7*^ small, shallow. Pleon segment 3, 

 postero-lateral angles bluntly produced. Eyes round. Antenna 1, 1^* Joint 

 Short and stout, 2^ long, a little longer than 3<^; flagellum ^2 ^s long as 

 peduncle, with 3 slender joints; accessoiy flagellum 1-jointed, about ^/g as 

 long as P* Joint of primary. Antenna 2 stouter and a little longer than antenna 1, 

 otherwise veiy similar; ultimate and penultimate joints of peduncle subequal 

 in length; flagellum as long as ultimate Joint of peduncle, with 3 slender 

 joints. Mandible, cutting plate quadridentate, accessory plate similar on left, 

 serrate on right, molar with small denticulate plate in front; 2*^ and 3^ joints 

 of palp broad, 3<^ the shorter. Maxillipeds, outer plates with 3 spine-teeth 

 on inner and 4 on distal margin, 4*^ Joint of palp short, blunt, tipped with 

 long spines. Gnathopod 1, 2<^ Joint a little bent, 5*^ cup-shaped, scarcely 

 longer than 4*'», 6*^ oval, about twice as long as 5*^; palm defined by 3 

 palmar spines, slightly overlapped by apex of finger. Gnathopod 2 in d, 

 2* Joint Channelled in front, shorter than 6*^; 5*^ Joint short, coalesced 

 with 6*^; 6**^ Joint very large, oblong, attaining a length 272 times the 

 width; bind margin produced into a long tooth, forming a deep cavity 

 between itself and the straight palmar margin, which is produced to a smaller 

 tooth near the finger-hinge; over the 2 cavities arches an immensely long, 

 curved, sinuous finger, with a small prominence on inner margin. Gnatho- 

 pod 2 in 9 is like gnathopod 1, but a little larger. Peraeopods 1 and 2, 

 2"^ Joint long oval, 4*^ rather broad, widening distally, 5*^ broader but much 

 shorter than 6^\ Peraeopod 3, 2^ Joint longer than broad, widest proximally. 

 Peraeopod 4 like the 3^, but 2^ Joint with bind margin more strongly serrate. 



