Dexamine, Tritaeta 517 



4. D. blosse villiana Bäte 1862 D. h., Bäte, Cat. Amphip. Brit. Mus., p. 131 

 t. 24 f. 2 j 1893 D. spinosa (part.), A. Della Valle in: F. Fl. Neapel, u20 p. 573. 



Very near to D. spinosa (p. 515), but distinguished as follows. Pleon 

 Segment 3 with a strong dorsal tooth on each side of the central one; 

 Segment 4 (in figure) with a small dorsal tooth in front of its apical one. 

 Eyes verv large, quadrate, Tclson very long, cleffc nearly to the base, each 

 externa! margin carrying 4 fasciculi of hairs, each apex serrated and cariying 

 a subapical spine. L. 10 mm. 



Habitat unknown. 



D. anisopus (Grube) 1861 Amphithöe (Amphit'onotus) a., E. Grube, Ausfl. Triest, 

 p. 136 I 1864 Dexamine a., E. Grube in: Arch. Naturg-., v. 30i p. 197 | 1893 D. spinosa 

 (part.), A. Della Valle in: F. Fl. Neapel, t;.20 p. 573. 



Probably identical with ü. spiniventris ; but peraeopods 1 and 2 not ymmetrical. 

 L. over 6 mm. 



Adriatic. 



D. leptonyx (Grube) 1861 Amphithöe (Amphitonotus) l, E. Grube, Ausfl. Triest, 

 p. 136 I 1864 Dexamine l, E. Grube in: Arch. Naturg., i).30i p. 198 | 1893 Atylus? l, 

 A. Della Valle in: F. Fl. Neapel, u20 p. 703. 



Probably identical with D. spinosa (p. 515); but Ist joint of antenna 1 is said 

 to be unarmed. L. 8 mm. 



Adriatic. 



D. miersii Hasw. 1885 D.w., Haswell in: P. Linn. Soc. N. S.Wales, v. 10 

 p. 102 t. 13 f. 8—12 1 1893 D. m., A. Della Valle in: F. Fl. Neapel, ^.20 p. 578. 



Torres Strait (Thursday Island). 



D. seitulus Harford 1877 D.s., Harford in: P. Calif. Ac, v.7 p. 116 | 1893 

 D. s., A. Della Valle in: F. Fl. Neapel, v. 20 p. 579. 



Magdalena Bay [Lower California]. Depth 11 m. 



2. Gen. Tritaeta Boeck 



1871 Lampra (Sp. un.: L. gibbosa) (non Jac. Hübner 1816, Lepidoptera !), A. 

 Boeck in: Forh. Selsk. Christian., 1870 p. 188 | 1876 Tritaeta, A. Boeck, Skand. Arkt. 

 Amphip., V.2 p.317 | 1888 T. (part.), T. Stebbing in: Rep. Voy. Challenger, ».29 p. 941 | 

 1894 & 95 r., G. 0. Sars, Crust. Norway, v. 1 p. 478, 698. 



Body rather stout in 9 , only pleon segment 4 dorsally produced. 

 Head, rostrum almost obsolete. Side-plates shallow, some of in-egular augular 

 form. Antennae 1 and 2 subequal; antenna 1 with long peduncle. Mouth- 

 parts and gnathopods 1 and 2 nearly as in Dexamine (p. 514), Peraeopods 

 1 — 5 strong, subequal, 4^^ Joint very long, 5*^ and 6**^ short, the spiniferous 

 widening of the 5^^ Joint giving all a subchelate character. Peraeopods 3 — 5, 

 2'^ Joint not much expanded, least in peraeopod 5. Uropods as in Dexamine. 



1 species. 



1. T. gibbosa (Bäte) ?1861 Amphithöe brevitarsis, E.Grube, Ausfl. Triest, 

 p. 135 I 1864 Dexamine b., E. Grube in: Arch. Naturg., d. 30i p. 196 | 1862 Atylus 

 gibbosus, Bäte (& Westwood), Brit. sess. Crust., v. 1 p. 248 f. | 1862 A. g., Bäte, Cat. 

 Amphip. Brit. Mus., p. 137 t. 26 f. 3 | 1871 Lampra gibbosa, A. Boeck in: Forh. Selsk. 

 Christian., 1870 p. 188 | 1876 Tritaeta g., A. Boeck, Skand. Arkt. Amphip., v.2 p.318 

 1. 12 f. 2 I 1890 T. g., A. O. Walker in: P. Liverp. biol. Soc, vA p. 249 1. 16 f . 4, 6 | 



