Amphithoides, Sunamphitoe 645 



4. Gen. Amphithoides Kossm. 



1880 Amphithoides (Sp. an. : A. longicornis), Kossmann, Reise Roth. Meer., v. 2l 

 Malacost. p. 135 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, r.29 p. 516, 517. 



Like Ampithoe (p. 631), except that antenna 1 has an accessory 

 flagellum, uropod 3 has only 1 well developed hook ou tlie outer ramus, 

 and the telson is flat, unarmed. 



1 species accepted, 1 doubtful. 



1. A. longicornis Kossm. 1880 A. l, Kossmann, Reise Roth. Meer, v. 2l 

 3Ialacost. p. 135 j 1893 Grubia crassicornis (part.), A. DellaValle in: F. Fl. Neapel, 

 «J.20 p.464. 



9. Side-plates as in Ampithoe (p. 631). Antenna 1 as long as body; 

 2*1 Joint rather longer than 1^*, 3* much shorter; flagellum 23-jointed; 

 accessory flagellum 2-jointed, shorter than P* Joint of primary. Antenna 2, 

 2'^ and 3*^ joints ot peduncle [? ultimate and penultimate] very long; 

 flagellum 17-jointed. ünathopods 1 and 2 almost exactly alike in shape 

 and size, but h^^ Joint rather longer and more slender in gnathopod 1, and 

 the palm defined by a palmar spine only in gnathopod 2; 6*^ Joint in both 

 widening to the convex palm, finger faintly serrate. Marsupial plates broad. 

 üropod 3, 2*1 hook of outer ramus indicated by a scarcely visible blunt 

 tubercle. L. 4 mm. 



Red Sea. 



A. comptus (S. 1. Sm.) 1873 Amphithoe compta, (S.I.Smith in:) A. E. Verrill 

 in: Rep. U. S. Fish Comm., v.l p. 564 | 1893 A.? c, A. DellaValle in: F. Fl. Neapel, 

 i-.20 p.463. 



Mouth-parts, uropod 3, and telson undescribed. L. reaching 13 mm. 



North-Atlantic (from North Carolina to OapeOod, amongeel-grass; Vineyard Sound, 

 at surface). 



5. Gen. Sunamphitoe Bäte 



1856 Sunamphitoe (nom. nud.), Bäte in: Rep. Brit. Ass., Meet. 25 p. 59 j 1857 

 S., Bäte in: Ann. nat. Hist., ser. 2 u 19 p. 147 | 1888 S., T. Stebbing in; Rep. Voy. 

 Challenger, v. 29 p. 1722 | 1857 Synamphithoe, A. White, Hist. Brit. Crust., p. 201 | 1862 

 Sunamphithoe, Bäte (& Westwood), Brit. sess. Crust., v.l p. 429 | 1894 S., G. 0. Sars, 

 Crust. Norway, v. 1 p. 584. 



Like Ampithoe (p. 631), but decisively distinguished by absence of 

 mandibulai- palp; in the bifid front lobes of lower lip the outer lobe less 

 prominent; gnathopod 2 in (5 much larger than gnathopod 2 in Q and 

 differently shaped; hooks of telson small. 



1 species. 



1. S. pelagica (M.-E.) 1830 Amphithoe p., H. Milne Edwards in: Ann. Sei. nat., 

 «.20 p.378 I 1840 Amphitoep., H. Milne Edwards, Hist. nat. Crust., v.S p.36 | 1856 Sun- 

 amphitoe hamvdus (nom. nud.) -|- S. conformattis (nom. nud.). Bäte in: Rep. Brit. Ass., 

 Meet. 25 p. 59 | 1857 S. h. ($?) + S. conformata (<J), Bäte in: Ann. nat. Hist., ser. 2 

 V. 19 p. 147 I 1857 Synamphithoe h. -f- S. c, A. White, Hist. Brit. Crust., p. 202 | 1862 

 Sunamphithoe h. -\~ S. c, Bäte & Westwood, Brit. sess. Crust., v.l p. 430 f.; p. 432 f. |, 

 1862 S. h. 4- S. c, Bäte, Cat. Amphip. Brit. Mus., p. 250 t. 43 f. 5; p. 251 t. 43 f. 6 | 

 1874 S. c, T. Stebbing in: Ann. nat. Hist., ser. 4 r. 14 p. 116 t. 12 f.4, 4a— d | 1894 

 S.o., Gr. 0. Sars, Crust. Norway, v.l p. 585 t.208 | ?18H1 Amphithoe grandimana, A. Boeck 

 in: Forh. Skand. Naturf., Mede 8 p. 668 | 1876 A. g., A. Boeck, Skand. Arkt. Amphip., 

 V. 2 p. 591 t. 26 f. 4 i 1893 Amphithoe hamulus -f- Grubia crassicornis (part.), A. Della 

 Valle in: F. Fl. Neapel, t?.20 p.463 t. 57 f. 28, 29; p.464. 



