Älicrodeatopus 593 



oblique palm; finger reaching the obtuse defining angle. Gnathopod 1 in y 

 much smaller than in ö, 6^^ Joint larger than 5*^, palm feebly defined. 

 Gnathopod 2 in Q smaller and more slender than the 1^*. Peraeopod 1 

 shorter than peraeopod 2; finger in both rather long and falciform. Peraeo- 

 pods 3 — 5 as usual in the genus. Cropods 1 — 3 reaching about the same 

 level; peduncle of uropod 3 extremely short. Telson short, arraed above 

 with a pair of peculiar conical protuberances bearing each a Single strong 

 bristle. Colour dii-ty white, somewhat pellucid. L. 4 — 5 mm. 



Ba3' of Bengal (Megna Shoals). Taken in the surface net, depth about 11 m. 



9. M. versioulatus (Bäte) 1856 Lenibos v. (nom. nud.), Bäte in: Eep. Brit. 

 Ass., Meet. 25 p. 58 | 1857 L. v., Bäte in: Ann. nat. Hist., ser. 2 u 19 p. 142 | 1862 

 Microdentopus v., Bäte, Cat. Amphip. Brit. Mus., p. 165 t. 30 f. 5 1 1895 Microdeutopus v., 

 A. 0. Walker in: Ann. nat. Hist., ser. 6 a 15 p. 469 | 1869 Microdeuteropus v., A. M. 

 Norman in: Rep. Brit. Ass., Meet. 38 p. 282 | 1874 M. v., T. Stebbing in: Ann. nat. Hist., 

 ser. 4 v. 14 p. 12 1. 1 f. 2, 2 a — f | 1876 Autonoe longipes (part.)?, A. ßoeck, Skand. Arkt. 

 Amphip., V.2 p. 574 | 1893 Microdevdopus anonuüus (part.)?, A. Della Valle in: F. Fl. 

 Neapel, u20 p.418. 



Head without rosti-um, lateral lobes obtuse, little produced. Side-plate 1 

 acutely produced in <5 . Pleon segment 3, postero-lateral corners obtusely 

 quadrate. Eyes rather large, dark. Antenna 1, 2^ Joint longer than l^S 

 about twice as long as 3*^; flagellum 15-jointed, accessory flagellum 1-jointed. 

 Antenna 2, ultimate Joint of peduncle subequal to penultimate, rather longer 

 than the 6-jointed flagellum. Gnathopod 1 in c? massive, the bulk depending 

 Chief ly on the very broad and long 5*^ Joint, of which the bind margin is 

 produced into a slrong, slightly outward curving tooth; the small 6*^ Joint, 

 Short and stout, with a median tubercle on the bind margin, closely approxi- 

 mates the tooth of the 5*^, which is crossed by the short serrate finger. 

 Gnathopod 2 in d very slender, hirsute on 4*^ — 6*^ joints with long plumose 

 setae, h'^ acute at apex, ö**» longer than 6**1, together forming a geniculation, 

 palm and finger very small. Gnathopod 1 in 5 , 5*^ Joint rather longer than 

 6*11, but about equal in breadth, palm rather oblique, feebly defined, over- 

 lapped by finger. Gnathopod 2 in 9 as in cS*. Peraeopods 1 and 2, 4*^ and 

 5*^ joints a little widened, finger nearly as long as 6*^ Joint. Peraeopods 3 — 5, 

 2<^ Joint pretty well expanded; peraeopod the longest. Uropod 3, rami 

 little longer than peduncle. L. 4 — 5 mm. 



North- Atlantic and English Channel (Plymouth; Salcombe Harbour; Shetland, depth 

 128-146 m). 



10. M. damnoniensis (Bäte) 1856 Lembos d. (nom. nud.), Bäte in : Rep. Brit. Ass., 

 Meet. 25 p. 58 t. 17 f. 9 | 1857 L. d., Bäte in: Ann. nat. Hist., ser. 2 v. 19 p. 142 1 1857 L. 

 danmoniensis, A. White, Hist. Brit. Crust.. p. 180 | 1862 Microdentopus gryllotalpa (err., 

 non Microdeutopus g. A. Costa 1853!), Bäte, Cat. Amphip. Brit. 3Ius., p. 163 t. 30 f. 1 | 

 1876 Microdeutopus g., A. Boeck, Skand. Arkt. Amphip., v. 2 p. 565 | 1893 M. anomalus 

 (part.) + M. algicola, A. Della Valle in: F. Fl. Neapel, ».20 p.417; p. 418 1. 1 f. 3; 

 t. 11 f. 1—12. 



Distinguished from M. propinquus by the gnathopod 1 in ci', which has 

 no accessory tooth on the 5*^ Joint, and the 6**^ Joint of almost uniform breadth. 

 Antenna 1, accessory flagellum with 1 (Bäte) or 2 (Della Valle) joints. Lateral 

 processes of telson rather prominently developed, with several setules on its sm- 

 face. Colour greenish grey, with some black spots. L. 4-5 — 6 mm. 



English Channel (South England); Bay of Naples, among algae. 

 Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 38 



