Metopoides, Proboloides 187 



by a small tooth. Marsupial plates almost circular. Peraeopods 1 — 5 nearly 

 as in M. parallelocheir. üropod 2, rami less unequal than in 2 preceding 

 species. üropod 3, 2*^ Joint of ramus much shorter than 1^^ Telson very 

 broad, though longer than broad, distally converging to an obtuse apex; 

 3 small spines on each margin. L. Q 3"5 mm. 



Strait of Magellan (Cape Virgins). Depth 100 lu. 



4. Gen. Proboloides Della Valle 



1871 Metopa (part.), A. ßoeck in: Forh. Selsk. Christian., 1870 p. 140 1 1893 

 Proboloides (part.), Ä. Della Valle in: F. Fl. Neapel, r. 20 p. 907. 



x\ntennae 1 and 2 subequal. not large; antenna 1 without accessory 

 flagellum or by exception perhaps with rudiraent. Mandible, molar wanting, palp 

 slender, 3-jointed, apical Joint small. Maxiila 1, palp large, 2-jointed. 

 Maxillipeds, inner plates separate, usually not very small, outer plates very 

 small or obsolete. Gnathopod 1 more or less subchelate. Gnathopod 2 

 distinctly subchelate in o , in ö powerful, with palm defined or undefined. 

 Peraeopods 3—5, 4*'^ Joint usually expanded and produced, 2*^ Joint expanded 

 in peraeopods 4 and 5. not or scarcely in peraeopod 3. 



7 species accepted, 1 doubtful. 



Synopsis of accepted species: 



( Peraeopod 8, 4th Joint rather narrow .... 1. P. grandimanus . . . p. 187 

 ) Peraeopod 3, 4tli Joint rather broad — 2. 



Gnathopod 2 in (5, palm undefined or imperfectiy 

 2 l defined — 3. 



J 



I Gnathopod 2 in (J, palm well defined — 6. 



j Peraeopod 3, 2d Joint distally widened ... 2. P. crenatipalmatus . p. 188 



) Peraeopod 3, 2d Joint not widened — 4. 



j Gnathopod 2, palm quite smooth 3. P. bruzelii j). 188 



\ Gnathopod 2, palm not quite smooth — 5. 



I Gnathopod 2, palm conspicnously dentate . . 4. P. gregarius . . . . p. 189 



) Gnathopod 2, palm inconspiciiously dentate . 5. P. calcaratus . . . . p. 189 



) Gnathopod 2, 2d Joint broad (j. P. glacialis p. 189 



\ Gnathopod 2, 2d Joint narrow 7. P. groenlandicus . . p. 190 



6 



1. P. grandimanus (Bonnier) 189H Probolinm grandimanum, J. Honnier in: 

 Ann. Univ. Lyon, v. 26 j). (^m t. 37 f. 4. 



^' uuknown. — d. Head without rostrum. Side-plate 1 njuch more deve- 

 loped than usually in this family, subtriangular, 2^ considerably smaller, 

 with acute apex directed forward. 3<^ and 4*^ larger Pleon segment 3, 

 postero-lateral corners rounded. Eyes small, round. Antenna 1, 1^* and 

 2^ joints long, equal, 3*^ very sbort, flagellum with more than 12 joints. Antenna 2, 

 ultimate Joint of peduncle rather shorter than the long penultimate, flagellum 

 with more than 10 joints. PJpistome very acute. Upper lip bilobed. Mandible 

 small, but these and other mouth-pai-ts in accord with generic character. 

 Maxillipeds, outer plates quite wanting. Gnathopod 1, 4*^ Joint well produced, 

 obtuse at apex, 5*^^ longer than 6*^, 6*^ distally widened, subchelate. Gnatho- 

 pod 2, 2*^ Joint Channelled in front. 4^^* Joint apically acute, 5^^ short. cup- 

 shaped, 6^'^ large, elongate, having near the hinge of fiuger 4 small teeth, 

 only that most remote from hinge acute, the rest of the margin nearly 



