3Iicrodeutopus 591 



General aspect that of an Ampithoe (p. 631). Mouth-parts, peraeopoda 

 and uropods as in M. gryllotalpa ; uropods more slender. Head rather large. 

 Side-plate 1 in d very much and acutely produced, in 9 rhomboidal. Eyes 

 small, round. Antenna 1 rather slender, 2^ Joint longer than 1^*, more than 

 thrice as long as 3*^, flagellum much longer than peduncle, 24-jointed, 

 accessory flagellum longer than 3*^ Joint of peduncle, 4-jointed. Antenna 2 

 moderately robust, ultimate Joint of peduncle as long as penultimate, muck 

 longer than the 8-jointed flagellum (Della Valle), or rather shorter than the 

 9-jointed flagellum (Sowinski). Gnathopod 1 in d, 2^ Joint greatly expanded, 

 5*^ massive but much longer than broad, produced into a large tooth, flanked 

 by a smaller one (Sowinski: wanting) within the palm, and a minute one 

 at its base on the bind margin; 6*^ Joint rather slender, with bind margin 

 extremely sinuous, not crenate; finger serrate, rather small. Gnathopod 2 

 in d, 2*1 Joint little expanded, 5*^ and 6*^ joints subequal, oblong, palm 

 oblique, ill-defined, finger small. Gnathopod 1 in 9, 6*^ Joint rather stout, 

 a little longer than 5**^, oblong, palm ti-ansverse, the rounded angle over- 

 lapped by the finger. Gnathopod 2 in 9, 2^ Joint slender, 6**^ stouter than 

 in ö and much longer than 5**^, finger matching palm. Telson longer than 

 broad, subelliptical with the apex feebly concave, without processes or setae. 

 Colour blackish grey, except antennae and distal parts of limbs. L. 10 — 12 mm. 



Mediterranean (Naples, in fine sand, depth 10 — 20 m ; Trieste) ; Black Sea, depth. 

 23—105 m. 



5. M. haswelli Stebb. 1879 Microdeuteropus chelifer (non Stimpsonia cheli- 

 fera Bäte 1862!), Haswell in: P. Linn. Soc. N. S. Wales, vA p. 340 t. 22 f. 3 | 1882- 

 Microdeutopus c, Haswell, Cat. Austral. Crust., p. 265 | 1899 M. hasivelli, T. Stebbing 

 in : Ann. nat. Hist., ser. 7 ü. 3 p. 350. 



Eyes small, round. Antenna 1 fully half as long as body, flagellum 

 longer than peduncle, accessory flagellum 3-jointed. Antenna 2 subpedifonn, 

 nearly as long as antenna 1, peduncle stout, flagellum shorter than ultimate 

 Joint of peduncle, obscurely multiarticulate. Gnathopod 1 in d very large, 

 2^ Joint apparently not expanded, ö^^^ massive, much longer than broad^ 

 widening distally, bind margin produced into a strong tooth, with a shorter 

 and biunter one between it and the base of the 6*^ Joint; 6*^ Joint very 

 much smaller than 5*^ front margin convex, bind strongly concave, with 

 small proximal tubercle; finger short, sen*ate. Gnathopod 2 small, 5*^ Joint 

 ovate, 6**1 a little longer, palm undefined. Peraeopods 1 and 2 stout. 

 Peraeopods 3 — 5, 2^ Joint long ovate, peraeopods 4 and 5 much longer 

 than S\ üropod 3 very small, rami short, subfoliaceous. Telson conical, 

 armed above with a few slender hairs. L. 5 mm. 



Port Jackson [East-Australia]. 



6. M. anomalus (H. Rathke) 1843 Gammarus a., H. ßathke in : N. Acta Ac. 

 Leop., V. 20 1 p. 63 t. 4 f. 7 ! 1855 G. (Gammaropsis) a., W. Liljeborg in : Vetensk. Ak. Handl., 

 1853 p. 457 I 1859 Autonoe anomala, ß. M. Bruzelius in: Svenska Ak. Handl., n. ser. u 3 

 nr. 1 p. 25 t. 1 f. 4 | \%i32 Microdeutopus anomalus, Bäte, Cat. Amphip. Brit. Mus., p.379| 

 1876 M. a., A. Boeck, Skand. Arkt. Amphip., v. 2 p. 567 t. 25 f. 5 | 1893 M. a. (part.), 

 A. Della Valle in: F. Fl. Neapel, t;.20 p.417 t. 56 f. 41 | 1894 M. a., G. 0. Sars, Crust. 

 Norway, v.l p. 540 t. 191 | 1898 M. a., Sowinski in: Mem. Soc. Kiew, u 15 p.480 t.lO 

 f. 20 -24 I 1869 Microdeuteropus a., A.M. Norman in: Rep. Brit. Ass., Meet. 38 p.281 | 1856 

 Lembos cambriensis (nom. nud.). Bäte in: Rep. Brit. Ass., Meet. 25 p. 58 j 1857 L. c.y 

 Bäte in: Ann. nat. Hist., ser. 2 v. 19 p. 142. 



Body very slender. Head, lateral lobes a little produced, rounded. 

 Side-plate 1 sharply and much produced in d, quadrate in 9, with front 



