386 Amathillopsis, Gammarellus 



Antenna 1, P* and 2^ joints equal in length, 3^ rather longer than '/s of 

 2^, flagellum broken, the remnant as long as 1^* Joint of peduncle, containiiig 

 50 Short joints, accessory flagellum seemingly represented by a strong, flat, 

 incurved spiae. Antenna 2 less robust, similar to that of A. spinigera, 

 flagellum iucomplete, with 70 joints, as in antenna 1 calceoliferous. Epistome 

 carinate. Upper lip, with the rounded margin flattened at centi*e. Lower lip 

 probably without inner lobes. Mandible, accessory plate much sti'onger ou 

 left than on right mandible, 3^ Joint of palp considerably longer than P*^ and 

 2** combiued. Maxüla 1, inner plate with 7 setae, outer with 11 spines. 

 Maxilla 2, inner plate merely ciliated on inner margin. Maxillipeds, inner 

 plates Short, outer reaching little beyoiid P* joiut of palp, ioner margin 

 denticulate. with submargiual spinules, apical margin with long spines, palp 

 elongate. Gnathopods 1 and 2, 2*^ Joint with distal half much expanded 

 behind, rest of limb as in A. spinigera. Peraeopods 1 and 2, 2*^ Joint with 

 bind margin a little expanded. Peraeopods 3 — 5 imperfect, 2*^ Joiut carinate 

 on front and bind margins, a little expanded behind proximally and in front 

 distally, shorter in 4* than 3^, and in 5**^ than 4*^, with proximal expansion 

 eucreasing. Pleopods with numerous cleft spines on 1^* Joint of inner ramus. 

 Uropod 1, peduncle longer than rami, outer ramus a little the shorter. üropod 2, 

 peduncle shorter than inner ramus. Uropod 3, peduncle much shorter than 

 the lanceolate rami, of which outer is slightly the shorter. Telson subequal to 

 peduncle of ui-opod 3, longer than broad, slightly naiTOwing to the weakly 

 emarginate apex. L. about 38 mm. 



Coral Sea (between Australia and New Guinea, lat. 12" S.. long. 145" E.). Depth 

 2560 m. 



12. Gen. Gammarellus Herbst 



1793 [Subgen.] GarnnrnreUus (part.), J. F. W. Herbst, Naturg. Krabben Krebse. 

 V.2 p. 106 i 1899 G., T. Stebbing in: Tr. Linn. Soc. London, ser.2 r.7 p.423 < 1837 Amathia 

 (Sp. un.: A. carinata) (non Lamouroux 1812, Hydrozoa!), H. Rathke in: Mem. pres. Ac. 

 St.-Petersb., v.'d p. 375 | 1862 Grayia (Sp. un.: G. imbricata) (non Alb. Günther 1858. 

 Reptilia!), Bäte (& Westwood), Brit. sess. Crust., v.l p. 151 | 1862 Graya (non 0. L. 

 Bonaparte 1856, Aves!) (part.). Bäte, Cat. Amphip. Brit. Mus., p. 101 ; t. 14 a, 16 | 1895 

 Grayia, A. O.Walker in: Ann. nat. Hist., ser. 6 n 15 p. 466 | 1862 Amathilla, Bäte & 

 Westwood, Brit. sess. Crust., o.l p.359 | 1893 A. (part.), A. DellaValle in: F. Fl. Neapel, 

 y.20 p.683 | 1894 A., T. Stebbing in: Bijdr. Dierk., «;. 17 p. 40 | 1894 A., G. O. Sars. 

 Grust. Norway, o. 1 p. 480. 



Body dorsally carinate. Anteiinae 1 and 2 subequal, iud calceoliferous, 

 accessory flagellum 4 — 7-jointed. Upper lip not emarginate. Lower lip, 

 inner lobes not distinct. Mandible normal, both plates dentale, spines of 

 spine-row numerous, 3"^ Joint of palj) falciform. armed on both margins. 

 Maxilla 1, inner plate with setae numerous, outer with 11 spines, 2^ Joint 

 of palp scarcely expanded distally. Maxilla 2, inner plate fringed near inner 

 margin. Maxillipeds, outer plates well armed, not reaching middle of palp's 

 2^ Joint, 3<i Joint of pp,lp notably smaller than 2^, very setose. Gnathopods 1 

 and 2, 5*^ Joint cup-shaped, 6*^ much larger, oval, palm feebly defined. 

 finger sti'ong. Peraeopods 1 — 5 rather stout, 2^ Joint oval in last thi-ee. 

 Branchial vesicles pleated obliquely. Uropod 3, rami single-jointed, lanceolate, 

 outer a little the longer. Telson feebly emarginate. 



2 accepted and 1 doubtful species. 



Synopsis of the accepted species: 

 Dorsal carina of some segments produced backward ... ] . ö. homari . . p. 387 

 Dorsal carina of no segment produced backward 2. G. augulosus . p. 387 



