Ampithoe 



633 



9 

 10 



11 



12 

 13 



14 



15! 



Peraeopods 1 and 2, 2d Joint with lower half 

 narrower than upper 



Peraeopods 1 and 2, 2<1 Joint with lower half 

 not narrower than upper — 9. 



Gnathopod 1, öth Joint longer than 6th . . . 

 Gnathopod 1, öth Joint shorter than 6tli — 10. 

 Gnathopod 2 in (5, 6th joint acuminate . . . 

 Gnathopod 2 in (J? ß*-^ Joint subovate .... 



Gnathopod 1, ßtb Joint much wider than 5th. 

 Gnathopod 1, 6tli joint not much wider than 

 5th _ 12. 



Maxiila 1, inner plate with several setae . . 

 Maxilla 1, inner plate with 1 seta or very 

 few — 13. 



Gnathopod 1, 5th joint longer than Qth . . . 

 Gnathopod 1, 5tli joint shorter than Hth — 14, 



Gnathopod 2 in cJ. palm deeply emarginate, 

 defined by a conspicuous tooth 



Gnathopod 2 in (5, palm not deeply emarginate, 

 not defined by a tooth — 15. 



Antenna 1, 3d Joint not very short 



Antenna 1, 3d joint very short 



8. A. flindersi . 



9. A. humeralis 



10. A. femorata . 



11. A. brevipes . 



12. A. brasiliensis 



13. A. kergueleni 



14. A. japonica . 



15. A. vaillantii 



p.635 



. p. 636 



. p.636 

 . p.637 



. p.637 



. p.638 

 . p.638 

 . p.639^ 



16. A. rubricata . 



17. A. Inda . . . 



. p.639 

 . p. 640 



1. A. megaloprotopus (Stebb.) 1895 Amphithoe m., T. Stebbing in: Ann. 

 nat. Hist., ser. 6 v. 15 p. 397 t. 14, 15B. 



Side-plate 1 very large, oblong with rounded angles, produced forward 

 so as completely to cover the mouth-parts; side-plate 2 not half as large. 

 Eyes rather small, rounded, black (in spirit). Antenna 1, 1^* joint strougly 

 setose below, 2'^ much thinner, a little shorter, 3^ small; flagellum longer than 

 peduncle, with more than 23 joints. Antenna 2, penultimate joint of peduncle 

 long. Mandible, 5 or 6 spines in the spine-row, 3*^ joint of palp nearly as 

 long as 2^ and 1^* combined. Maxilla 1, inner plate with 3 small setae on 

 inner margin. Maxillipeds, base very stout. Gnathopod 1, 2^ joint narrow, 

 Channelled in front, with prominent distal lobe, 5*^ cup-shaped, short, 6*^ 

 massive, as long as 2^, oblong, with rather convex front; palm nearly trans- 

 verse, a little concave, sharply defined, a little overlapped by the finger. 

 Gnathopod 2 like gnathopod 1, but 6*^ joint rather shorter and narrower, 

 palm more sinuous, the short, cuiTed finger closing down within its defining 

 point. Peraeopods 1 and 2, 2*^ joint narrowly oval. Peraeopods 3 and 4, 

 2^ Joint broad. Peraeopod 5, 2^ joint narrower in proportion to length 

 than in peraeopods 3 and 4, but only constricted close to distal end. Branchial 

 vesicles broadly flask-shaped. Pleopods with 2 coupling-spines, 6 cleft 

 spines, rami 17^ — 19-jointed. üropods 1 and 2 spinöse, üropod 3, rami 

 little more than half as long as peduncle, with the usual 2 upturned spines 

 on outer ramus. Telson slightly broader than long, with lateral setules, apex 

 bluntly tiiangular between 2 small upturned hooks, with a backward pointing- 

 seta adjoining each hook on inner side. L. about 11 mm. 



Tropical Atlantic (Antigua). From sea-weed on rocks. 



2. A. lacertosa (Bäte) 1858 Amphithoe l., Bäte in: Ann. nat. Hist., ser. 3 v.l 

 p. 362 I 1862 A. l, Bäte, Cat. Amphip. Brit. Mus., p. 236 t. 41 f. 5 | 1893 A. l, A. Della 

 Valle in: F. Fl. Neapel, k.20 p.461 t. 57 f. 37. 



