Leptocheinis 629 



Peraeopod 3, 2^ Joint broadly oval, both margins convex (in figure); 4*^ 

 Joint longer than 5^^ or 6^^; finger small. Peraeopods 4 and 5, 2^ Joint 

 broadly oval; peraeopod 5 much the longest. üropods 1 — 3 reaching nearly 

 the same level, the rami long, unequal, the spines long and slender. Uropod 1, 

 rami slender, longer than peduncle. Uropod 2, peduncle rather short, as in 

 uropod 1 with long apical spine, rami longer than peduncle, the longer also 

 much the stouter. Uropod 3, peduncle with tooth at inner angle, rami 

 longer than peduncle. Telson broad, but short, lateral angles of apex very 

 prominent, each with a spine, the apex triangulär, produced to an obtuse 

 point. Colour lemon-yellow, sprinkled with many red-brown spots. L. 6 — 7 mm. 

 Bay of Naples. Depth 10—20 m. 



6. L. pectinatus (Norm.) 1869 Protomedeia pectinata, A.M.Norman in: Rep. 

 Brit. Ass., Meet. 38 p. 283 j 1887 Ptilodieirus pectinatus, Chevreux in : Bull. Soc. zool. France, 

 v.\.2 p. 309 ! 1888 Leptochdrus p., T. Stebbing in: Rep. Voy. Challenger, u 29 p. 1707 | 

 1894 L. p., G. 0. Sars, Crust. Norvsay, v.l p. 555 | 1893 L. pilosus (part.), A. Della 

 Valle in: F. Fl. Neapel, u 20 p. 427 1 1895 L. p., A.O.Walker in: F. Liverp. biol. Soc, 

 V.9 p. 310. 



Agreeing with L. dellavallei (p. 628) except in the following particulars. 

 Side-plate 1 quadrate, lower front corner scarcely produced, slightly obtuse. 

 Antenna 1, 3* Joint % (sometimes less) as long as 2*^; flagellum about 

 10-jointed. Antenna 2 relatively longer, the ultimate and penultimate joints 

 of peduncle being more elongate. Peraeopods 1 and 2 with 6*^ Joint and 

 finger not quite so long and slender as in L. dellavallei. Peraeopods 3 — 5 

 probably in agreement with that species. Uropods 1 — 3, spines seemingly 

 less elongate. Uropod 3, tooth at inner angle of peduncle more produced. 

 Telson, apical border between the prominent angles not triangulär but gently 

 convex. L. about 5 mm. 



North-Atlantic (Shetland Islands). 



7. L. guttatus (Grube) 1864 Protomedeia guttata, E. Grube in: Jahresber. 

 Schles. Ges., v.il p. 63 | 1866 P. g., E. Grube in: Arch. Naturg., ü.32i p. 408 t. 10 

 f. 3 I 1888 Leptocheinis guttatus, T. Stebbing in : Rep. Voy. Challenger, v. 29 p. 366 | 

 1894 L. g., G. 0. Sars, Crust. Norway, v. 1 p. 555. * 



Q . Pleon Segment 4 with 3 medio-dorsal small teeth, the 2 lateral 

 teeth produced further back than the middle one. Side-plates 1 — 4 not so 

 deep as in L. hirsutimanus (p. 627). Side-plate 1 (figure) quite clear of side- 

 plate 2, which is subequal to 3^ or 4*'^; 5*^ produced a little below 4*'». 

 Eyes suborbicular. Antenna 1 almost ^/g as long as body; V^ and 2*^ joints 

 equal; flagellum 7-jointed, accessoiy flagellum not perceived. Antenna 2 

 not much shorter, flagellum 3-jointed. Gnathopod 2, 5*^ and 6*^ joints less 

 elongate than in L. hirsutimanus; finger as slender. and acute as, though 

 less long than, that of peraeopod 1. Peraeopods 1 and 2, 4*-'^ Joint sub- 

 quadrate. Peraeopod 3 short, 2<^ Joint oval. Peraeopod 5 much longer than 

 preceding peraeopods, but not extremely elongate. Colour tawny, with round 

 spots, few but large and conspicuous, of bright reddish brown in tranverse 

 bands on the head and segments (1^* of peraeon and last 4 of pleon excepted), 

 including side-plates and 2*^ Joint of peraeopods 3 — 5. In other respects 

 the species is said to resemble L. hirsutimanus. L. 5 mm. 



Adriatic. 



8. L. trieristatus (Che\Teux) 1886 & 87 Ptilocheirus t., Chevreux in: Bull. Soc. 

 zool. France, u 11 p. XL; v. 12 p. 310 t. 5 f. 3, 4 | 1888 Leptocheirus t, T. Stebbing in: 

 Rep. Voy. Challenger, v. 29 p. 1708 | 1894 L. t, G. 0. Sars, Crust. Norway, v. 1 p. 555. 



