Stenothoe 



193 



I 



A. Costa in: fiend. Soc. Borbon., n.seT.v.2 p. 170 | 1856 Montagna (non Leach 1813/14, 

 Decapodal). Bäte in: Kep. Brit. Ass., Meet. 25 p. 57 | 1857 M. (part.), Bäte in: Ann. 

 nat. Hist., ser. 2 v.ld p. la7 | 1871 Metopa (part.), A. Boeck in: 

 Forh. Selsk. Christian., 1870 p. 140 1 1883 Montaguana, Chilton 

 in: Tr. N. Zealand Inst., v. 15 p. 78. 



Autennae 1 and 2 usually subequal, flagellum long 

 in autenna 1, peduncle in autenna 2. Mandible, molar 

 evanescent. Maxilla 1, palp large. Maxillipeds (Fig. 51), 

 inner plates very small, outer evanescent or whoUy 

 absent, palp elongate, 4*^ Joint ciliated on concave margin, 

 Gnathopods 1 and 2 more or less distinctly subchelate. 

 Gnathopod 1, 4*'^ Joint produced into a lobe along side 

 of the 5*'i (except in S. peltata, p. 194). Gnathopod 2, 

 6*'^ Joint powerful, usually differing to some extent in 

 the 2 sexes. Peraeopod 3, 2^ Joint linear (except in 

 S. valida, p. 194). 



15 species accepted, 3 obscure. 



Synopsis of accepted species: 



( Back carinate 1. S. richardi 



\ Back not carinate — 2. 



Fig. 51. 



S. adhaerens. 



MaxiUipeds. 



j Beraeopod 3, 2d Joint expauded 



2. S. valida 



3. S. peltata 



4. S. antennulariae 



5. S. cattai 



6. S. clypeata 



J 



Peraeopod 3, 2d Joint not expanded — 3. 

 \ Gnathopod 1, 4tt Joint not -distinctly produced 

 I Gnathopod 1, 4th Joint distinctly produced — 4. 

 I Gnathopod 1, 2d Joint strongly bent at base . 

 ) Gnathopod 1, 2d Joint straight — 5. 

 _ f Uropod 3, 2d Joint of ramus geniculate .... 

 \ Uropod 3, 2d Joint of ramus straight — 6. 

 I Gnathopod 2, palm with a single deep excavation 

 <j ; Gnathopod 2, palm with more than one or with 

 I no excavation — 7. 

 Uropod 3, peduncle much shorter than ramus — - 8. 

 Uropod 3, peduncle longer or scarcely shorter 



than ramus — 0. 

 Gnathopod 2, ßth Joint subquadrate, palm slightly 



oblique 



Gnathopod 2, 6th Joint elongate, palm extremely 



oblique 8. S. dollfusi . 



Peraeopods 3 — 5, 4tli Joint narrow and little 



produced — 10. 

 Peraeopods 3 — 5, 4thjoint widened and produced — 11. 

 Antennae 1 and 2 of considerable length, palm 



of gnathopod 2 in (5 not deeply incised . . 9. S. tenella . . 

 Antennae 1 and 2 extremely long, palm of gnatho- 



' pod 2 in (5 deeply incised 10. S. megacheir 



. J Eyes ill developed 11. S. microps . 



\ Eyes well developed — 12. 



7. S. monoculoides 



J 



10 



f Gnathopod 2 in cJ, palm denticulate throughout 12. S. marina 



13 



Gnathopod 2 in (5, palm denticulate only at apex 13. S. bosphorana*) 



\ Gnathopod 2 in $ , palm defined 14. S. brevlcornis 



) Gnathopod 2 in $ , palm undefined 15. S. adhaerens . 



194 



194 



194 



195 



195 



195 



p. 196 

 p. 196 



p. 196 



p. 197 

 p. 197 



p. 198 

 p. 198 

 p. 199 

 p. 199 



*) S. bosphorana $ is distinguished from S. hrevicornis $ by the gnathopod 2 

 with palm ill-defined, and from S. adhaerens $ by the gnathopod 1 with 4tii Joint not 

 produced to apex of 5th. In S. marina the telson has 2 spines on each side, in 

 S. adhaerens 4, in S. hrevicornis none. 



Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 13 



