162 Leucothoidae, Seba 



or rudimentaiy, palp well developed, 4*'^ Joint long. Of the gnathopods one 

 or both pairs chelate. üropods 1 — 3 almost or entirely unarmed. Telson entire. 



Marine. 



8 genera, 14 accepted species and 7 doubtful. 



Synopsis of genera: 



/ Gnathopod 1, chela formed between 6th and 



J yth joints; uropod 3 uniramous 1. Gen. Seba p. 162 



j Gnathopod 1, chela formed between 5*^1 and 



l 6th joints; uropod 3 biramous — 2. 



f Maxillipeds, outer plates rudimentary .... 2. Gen. Ijeucothoe . . . p. 163 



\ Maxillipeds, outerplatessmalljbut well developed 3. Gen. Paraleueothoe . p. 169 



1. Gen. Seba Bäte*) 



1862 Seba (Sp. un. : S. innominata), (A. Costa in MS.) Bäte, Cat. Aniphip. Brit. 

 Mus., p. 159 I 1888 S., T. Stebbing in: Rep.Voy. Challenger, ».29 p. 782 j 1893 S., 

 A. DellaValle in: F. Fl. Neapel, 17.20 p. 773 | 1884 Teraticum (Sp. uu.: T. typimm), 

 Ohilton in : Tr. N. Zealaud Inst., v. 16 p. 257 | 1889 Grimaldia (Sp. un. : G. armata), 

 Chevreux in: Bull. Soc. zool. France, w. 14 p. 283. 



Antenna 1 stouter than autenna 2, botli with peduncle long, flagellum 

 Short, accessory flagellum very small, 2-jointed. Upper lip with symmetrical 

 slightly sinuous margin, epistome bluntly couical. Lower lip without inner 

 lobes. Mandible, cutting plate strongly dentate, accessory plate denticulate, 

 smaller on right than on left, spine-row of 4 spines, molar obsolete, palp 

 with 3"^ Joint much shorter and narrower than 2''. Maxiila 1, inner plate 

 small, outer with 7 spines, palp 1-jointed. Maxiila 2, plates short, inner 

 shorter and broader than outer. Maxillipeds, plates rather small, feebly armed, 

 not rudimentary, palp well developed, 4*^ Joint elongate. Gnathopod 1 

 chelate or subchelate; gnathopod 2 chelate, 'S'^ Joint elongate; in both the 

 basal part of the 6*^ Joint much larger than the thumb. Uropod 2 not 

 shorter than the others. Uropod 3 uniramous. Telson triangulär, entire. 



2 species. 



Synopsis of species: 



Antenna 1, flagellum longer than peduncle; peraeopods 3 — 5, 



2d Joint narrow LS. innominata . p. 162 



Antenna 1, flagellum shorter than peduncle; peraeopoäs3 — 5, 



2d Joint broad 2. S. saundersii . . p. 163 



1. S. innominata Bäte 1862 S. L, (A. Costa in MS.?) Bäte, Cat. Amphip. 

 Brit. Mus., p. 159 t. 29 f. 5. 



Peraeon segments subequal. Pleon segments 1—3 with sinus above 

 the postero-lateral angle, well marked in segment 3. Eyes small. Antenna 1 

 nearly half as long as the body, flagellum a little longer than peduncle. 

 Autenna 2 rather shorter than antenna 1, but with peduncle equally long. 

 Gnathopod 1, 5*^ Joint as broad as 6*^^ but only half as long, 6*'^ with chela- 

 forming process as long as finger. Gnathopod 2 similar, but rather larger, 

 with 5*^ Joint rather nan'ower and very much shorter than 6*^ Peraeopods 3 — 5 

 (in fig.) with narrowly oval 2^ Joint. 



Gulf of Naples. 



*) Bäte, 1862, attributes the authorship of the genus (and of the species innominata) 

 probably by error to A. Costa. 



