Seba, Leucothoe 163 



2. S. saundersii Stebb. 1875 S.S., T. Stebbing in: Ann. nat. Hist., ser. 4 ul5 

 p. 186 t. 15 f. 2, 2a— c I 1888 S. s., T. Stebbing in: Rep. Voy. ühallenger, ».29 p. 783 

 t.49 I 1893 S.S., A. DellaValle in: F. Fl. Neapel, u 20 p.774 t. 60 f. 32— 34 | 1884 

 S. typica, Chilton in: N. Zealand J. Sei., v.2 p. 230 i 1884 Teraticum typicum, Chilton 

 in: Tr. N. Zealand Inst., v. 16 p. 257 t. 18 f. la — g | 1889 Grimaldia arniata, Chevreux 

 in: Bull. Soc. zool. France, ul4 p. 284 f. | 1899 Seba a., Chevreux in: C.-K. Ass. FranQ., 

 Sess. 27 V. 2 p. 483. 



Side-plate 1 directed forwards, 4**^ not specially larger than any of the 

 preceding (smaller than any in Chevreux's fig.). Pleon segment 3, postero- 

 lateral angies rounded, produced backward; segments 5 and 6 coalescent 

 (Chevreux). Antenna 1, 1^* Joint thicker but rather shoiier than 2*^, 3*^ about 

 Vg length of 2^, flagellum 5-jointed, accessory flagellum with 2 joints, of which 

 the 2*^ is minute. Antenna 2, ultimate Joint of peduncle shorter than penultimate, 

 flagellum 3-jointed. Gnathopods 1 and 2, 5*^ Joint triangulär, not produced, 

 6*^ with a base which in gnathopod 1 is broad and setose on the hind 

 margin, but longer, narrower, and smooth in gnathopod 2; in both produced 

 so as to form with the tinger a perfect chela; gnathopod 1 sometimes (in 

 d?) subchelate, 6**^ Joint being subquadrate, with the palm transverse, crenate 

 uear the tinger hinge, hollowed in the centre, with a tooth in the hollow 

 (Chilton). Peraeopods 1 and 2 slender. Peraeopods 3 — 5, 2^ Joint oval, hind 

 margin most seiTate in the 5*^ pair; 3'^ pair smaller than 4*^ or 5*^. üropod 1, 

 rami longer than peduncle, inner rather the longer. üropod 2 stouter, peduncle 

 more nearly equal to the long, subequal rami. üropod 3, the simple ramus longer 

 than peduncle. Telson triangulär oval, end blunt. L. Q 4 mm. 



Strait of Magellan (Cape Virgins, depth 100 m); Algoa Bay?, from sponges; 

 South-Pacific (New Zealand) ; North-Atlantic (Azores, depth 1287 m ; Belle-Ile-en Mer, 

 depth 180 m). 



2. Gen. Leucothoe Leach 



1793 Subgen. Gammarellus (part.), J.F.W. Herbst, Naturg. Krabben Krebse, 

 v.2 p. 106 I 1813/14 Leucothoe (Sp". un.: L. articulosa), Leach in: Edinb. Enc, v.7 

 p. 403, 432 I 1826 Leucothoe, Audouin in: Descr. Egypte, v. liv p. 92 | 1840 T^eucothoe, 

 0. G. Costa, Fauna Reg. Napoli, Crost., Cat. p. 5 j 1888 Leucothoe, T. Stebbing in: 

 Rep. Voy. Challenger, v. 29 p. 771 | 1892 L., G. 0. Sars, Crust. Norway, v. 1 p. 282 | 1893 

 Leucothoe, A. DellaValle in: F. Fl. Neapel, u20 p.651 | 1816 Lycesta (Sp. un.: L.fur'ma), 

 Savigny, Mem. An. s. Vert., v. 1 p. 109. 



Side-plates 1 — 4 broad compared with their depth. Antenna 1 stouter 

 than antenna 2, both with peduncle long, flagellum ^hort, accessory flagellum 

 of antenna 1 very small, 1-jointed. Epistome conically projecting. 

 Upper lip unsymmetrically bilobed (Fig. 41). Lower lip without 

 inner lobes. Mandible, cutting edge strongly dentate, accessory 

 plate well developed on left, very small on right, molar obsolete, 

 3*^ Joint of palp much smaller than 2*^. Maxilla 1, inner plate 

 very small, with 1 seta, outer with 7 spines, palp 2-jointed. 

 Maxilla 2, inner plate broader than outer. Maxillipeds, inner 

 plates Short and broad, partly coalesced, outer very small or 

 rudimentary, the inner edge of the Joint carrying it being 

 sharpened, palp large. Gnathopod 1 chelate between 5*^ and 

 6*'! joints, 5*11 bulbous at base and produced into a slender Fig. 4i. 

 thumb, parallel to the 6*^ 7**' small, folding over apex of 5*^'. l- miersi. 

 Gnathopod 2 powerful, subchelate, 5*'i Joint setose, produced uppe^iip" 

 along hind margiu of the large oval G*^ finger strong, 

 curving over the long oblique palm nearly to the process of 5*'' Joint. 



II« 



