346 On Two new Species of Amphipoda Gammarina. 



Uropoda injured, the first with peduncles as long as the 

 rami, which are narrow, equal, and spinous; the second 

 shorter than the first, with subfoliaceous (?) rami ; the third 

 foliaceous and probably setose, the inner ramus rather shorter 

 than the outer, which is coarsely serrate on the inner side and 

 is terminated by a short strong spine. The peduncle is 

 short, widening distally, with a median and terminal spine. 



Telson longer than the peduncle of the last uropoda, cleft 

 to the base, with a notch at the tip of each division. 



Length 7 millim. 



A single male specimen was found in a very interesting 

 collection of Crustacea made by Mr. R. L. Ascroft in the 

 Bteam trawler ' Britannic,' off the Isle de Yen, in the north of 

 the Bay of Biscay, the depth being 17 to 32 fathoms, bottom 

 sand and mud. This species approaches the genus Ilalice, 

 Boeck, very closely in general form, structure of the mouth- 

 organs, antenna? (with the exception of the accessory ap- 

 pendage), gnathopoda, last three pair of perasopoda, uropoda, 

 and telson ; but it differs from that genus in having no acces- 

 sory appendage at the base of the first joint of the flagellum 

 of the upper antennas, and from every known Amphipod, so 

 far as I am aware, in having a small but distinct scale-like 

 accessory appendage at the base of the last (third) joint of the 

 peduncle. Both the upper antennas are exactly alike in this 

 respect. The first and second pairs of perseopoda resemble 

 those of the genus Synopia, Dana, in the dilated third and 

 fourth joints, and thus connect this genus with the Parda- 

 liscidas in this respect, just as Synopioides, Stebbing, does in 

 the shape of the head. There remains, therefore, nothing to 

 justify Bovallius's establishment of the subtribeof Amphipoda 

 Synopidea, — Claus, Stebbing, and G. O. Sars having already 

 pointed out the relationship of the titular genus to the Gam- 

 marina, and the remaining genera having been referred to 

 other families, viz. Trischizostoma to the Lysianassidae and 

 Hyperiopsis to the Hyperiidea. 



EXPLANATION OF PLATE XVI. 



Figs. 1-6. Phoxocephalus pectinatus. 1. Upper antenna, c?. 2. Lower 

 antenna, 5 . 3. First gnathopod, $> . 4. Second gnathopod, § . 

 5. Last pereeopod, 5 . 6. Last pereeopod, J 1 . 



Figs. 7-18. Halicoides anomala. 7. Head. 8. Peduncle and first joint 

 of flagellum of upper antenna. 9. First gnathopod. 10. Second 

 gnathopod. 11. First peraeopod. 12. Third peraeopod. 13. 

 Fifth peragopod. 14. Telson and last uropod. 15. Mandibles. 

 16. First maxilla. 17. Second maxilla. 18. Maxillipede. 



Figs. 1-6, 8, and 15-18 are drawn with a |-inch objective, 

 the rest with a 1-inch.l 





