194 Stenothoo 



1. S. richardi Chevreux 1895 S. r., Chevreux in: ^Icm. Soc. zool. France, 

 «.8 p.432 f. 



Head, lateral angles broadly rounded, rostriim little curved. B(xly 

 miich compressed, dorsal carioa prodiiced into a tooth oii each segmont 

 frora 3^ of peraeon to 3*^ of pleon. Side-plate 2 irregularly pentagonal. 

 4^^ wider tliaii deep, rounded behiud. Pleon segment 3, postero-lateral 

 angles strongly prodiiced, sharply uncinate. Eyes very large, round. Antenna 1, 

 1^* and 2*^ joints subequal, 3*^ very short, flagellum 18-jointed. Antenna 2. 

 ultimate Joint of peduncle rather longer tlian long penultiraate, flagellum very 

 Short, 10-jointed. Alaxillipeds, ultimate Joint of palp longer than pcnultimate. 

 Gnathopod 1, 4*^ Joint not quite reaching apex of 5*'', 6^^ long oval, rather 

 longer than 5*''. Gnathopod 2, 6*^ Joint broadest at base, where there is 

 a sraall spinous protuberance, reached by long finger curving over crenuhito 

 palra. Peraeopod 5, 2*^ Joint exceptionally broad and expanded. üropod 3. 

 peduncle much longer than raraus, of which 2<^ Joint is rather longer than 

 1^*. Telson broadly oval, 4 spines on each side, one median, apex acute. 

 L. (5 5 mm. 



Bay of Biscay (lat. 47» X., long 8MV.). Depth 748— 1262 m. 



2. S. valida Dana 1852 S., J.D.Dana in: Amer. J. Sei., ser. 2 f. 14 p. 311 

 1853 & 55 S.vaUdus, J.D.Dana in: U. S. expl. Exp., v.l3ii p.924; t. 63 f.la-o | 1893 

 S. valida (pari), A. DellaValle in: F. Fl. Neapel, f. 20 p. 566 t. 58 f. 74— 78 | ? 1853 

 Probolium polyprion, A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p. 173 ! 1876 Steno- 

 thoep., A.Boeck. Skand. Arkt. Amphip., u2p.446j ISßG Probolium megachelea, Cam. Heller 

 in: Denk. Ak. Wien, v. 26n p. 13 t. 2 f. 1, 2. 



Eyes small. round. Antenuae 1 and 2 nearly equal; antenna 1 as figured 

 is the shorter in d, the longer in 9. Antenna 2, ultimate Joint of peduncle 

 shorter than penultimate. Gnathopod 1, 4*^* Joint longer than 5*^, its base 

 in ö longer, in 9 shorter, than the produced part, 6*^ narrow oval, finger 

 (as figured) much larger in ö than in 9 . Gnathopod 2, 4*^ and 5*** joints 

 Short, 6*^ in ö very large, oblong, margins nearly parallel, an obtuse 

 tooth at lower apex, finger long and stout, bind margin of band partly 

 pubescent (Costa: minutely sen-ate); in the 9 this Joint is rather smaller. 

 more oval, witli a small tubercle in place of the tooth, finger shorter and 

 less powerful. Peraeopods 3—5, 2'^ Joint well expanded, 4^^* Joint raoderately 

 so. üropod 1 extending beyond uropod 2, and uropod 2 l)eyond uropod 3. 

 üropod 3 (as figured) has peduncle stout, rather shorter than ramus, of 

 which 2"^ Joint is longer than 1^*. Telson apparently caming 3 lateral 

 spines. L. 6 — 8 mm. 



Tropical Atlantic (Rio Janeiro); Mediterrancan? 



3. S. peltata S. I. Sm. 1876 S.p., S.I.Smith (& Harger) in: Tr. Connei t. 

 Ac. v.S p. 29 t. 3 f. 5— 8 i 1893 S. j)., A. DellaValle in: F. Fl. Neapel, f. 20 p. 570. 



Side-plate 3 deeper, not wider than 2"^, 4*^ as wide (or long) as 

 length of peraeon segments 1 — 5. Eyes round, nearly white in spirit. 

 Antenna 1 in 9 , flagellum 8-jointed, scarcely longer than peduncle. Antenna 2 

 rather longer than antenna 1, ultimate and penultimate jointsi of peduncle 

 subequal, flagellum subequal to that of antenna 1. Gnathopod 1, 4*^ Joint 

 triangulai-, distally broader than 5*^ 5^^ parallel-sided, 6*^ naiTower but 

 slightly longer than 5^^. distally naiTOwed, finger about half as long. Gnatho- 

 pod 2, 6*^ Joint nearly twice as long as broad, palm convex, slightly oblique» 



