Leucüthoe. Paraleucothoe 169 



L. stylifera Stiraps. 1855 L. s., Stimpson in: P. Ac. Philad., v.l p. 383 | 1893 

 L.S., A. DellaValle in: F. FI. Neapel, t). 20 p. 656. 



L. 8 mm. 



North-Pacific (Japan). 



'S. Gen. Paraleucothoe Stebb. 



1899 Paraleucothoe (Sp. typ.: Leticothoe novae-hollandiae), T. Stebbing in: Ann. 

 nat. Hist., ser. 7 v. 4 p. 208. 



Body stout; peraeon segment 1 longer than 2*^. Antenna 1 larger 

 than antenna 2, witli rudimentary accessory flagelluni. Antenna 2, flagellum 

 sborter than peduncle. Mandible, cutting edge with few teeth, accessory 

 plate larger on leffc tban right mandible, molar wantiug, 3<^ Joint of palp 

 slight, but longer than lialf 2'1 Maxilla l, outer plate witJb 5 seta-like spines, 

 palp very large, 1-jointed, with expanded base. Maxilla 2, inner plate the 

 longer, both plates apparently almost devoid of spines or setae. Maxillipeds, 

 inner plates broad and long, narrow at base, coalesced, but with median line 

 of Separation, apical raargin slightly concave, the median part produced 

 inward so as to give the effect of an additional pair of plates, also 

 coalesced, not quite reaching the apical margin of the others, but surraounted 

 by tlie 3 pairs of spine-teeth usually found on the true apex, outer plates 

 not rudimentary but small, scarcely reaching apex of 1^* Joint of palp, armed 

 with a Single spinule at inner apex, 2^' Joint of palp the sliortest. Gnathopod 1 

 chelate between h^^ and &^^ joints, apex of 6^^ Joint grooved to received the 

 finger. Gnathopod 2 subchelate, 5*^^ Joint slightly produced. finger stroug, 

 but not nearly reaching process of ö*'^ Joint. Peraeopods-3 — 5 subequal, 

 2*' Joint expanded. Uropod 3 reaching beyond uropod 2, peduncle longer 

 than the smooth equal rami. Telson triangulär oval. 



1 species. 



1. P. novaehoUandiae (Hasw.) 1880 Leucothoe n.-h., Haswell in: F. Linn. Soc. 

 N.S.Wales, vA p. 329 t. 20 f. 2 | 1884 L. n.-h., Miers in: Rep. Voy. Alert, p. 314 | 1893 

 L. n. h., A. Della Valle in: F. Fl. Neapel, v. 20 ]). 656 j 1899 L. n.-h., Paraleucothoe sp. typ., 

 T. Stebbing in : Ann. nat. Hist., ser. 7 u 4 p. 208. 



Head rather small. Peraeon segment 1 rather tumid, longer than any 

 succeeding peraeon segment. Side-plate 1 broader than 2^ or 3*^, some- 

 what produced forward. Pleon segment 3, postero-lateral. corners sub- 

 quadrate, not produced. Eyes large, oval. Antenna 1, 2^ Joint slightly 

 longer than 1^*, or shorter, and in the latter case the 3^, though much narrower is 

 more than V,, as long as 2*^; flagellum 13-jointed. much shorter than peduncle, 

 accessory flagellum like a tubercle, yet seemingly 2-jointed. Antenna 2 sub- 

 equal in length to antenna 1, ultimate Joint of peduncle shorter than penultimate, 

 flagellum very short, 9-jointed. Lower lip, mandibulai* processes quadrate. 

 Mandible, 8 spines in the spine-row, tapering 3"^ Joint of palp tipped with 

 a long spine. Maxillipeds very narrow, outer plates a little longer than 

 broad, one overlapping the other, the peculiar structure of the inner plates 

 making it impossible to flatten down the outer plates and elongate palps. 

 Gnathopod 1 large in correspondcnce with the size of the peraeon segment 1 

 and its side-plate, 3^ Joint larger than 4P^; 5*^ with base massive, broad 

 and long, produced to a process shorter than base, but tapering to end 

 of bind margin of the 6*^^, which from a narrow base becomes subquadrate 

 and has a gi-ooved truncate apex, within which is almost concealed the 



