638 Ampithoe 



Body compressed. Side-plates large. Aiitenna 1 rauch longer than 

 half body; flagelium veiy long, slender. Antenna 2 a little shorter, hirsute; 

 peduncle hardly shorter than flagelium. Gnatbopod 1, 5*^^ Joint (in figure) 

 shorter and much narrower than 6^^, 6*^ with front margin slightly convex, hind 

 margin and palm (described as oblique-transverse) together makiug (in figure) a 

 great bulge without any defining mark; finger half as long as 6**^ Joint. Gnatho- 

 pod 2 not much larger, more hirsute, 5*^ Joint distally cup-shaped, 6*^ oblique- 

 transverse at apex; palm hardly excavate, long hirsute, acute at lower limit 

 (in figure: widening to a slightly oblique, well defined palm, which is very 

 different in appearance from that of gnathopod 1). The mouth-parts and 

 uropod 3 as figured are fairly appropriate to Ampithoe. Maxilla 1 shows 

 no inner plate, but a tuft of 5 setae at the place proper to the inner plate. 

 L. 16 mm. 



Tropical Atlantic (Rio Janeiro). 



13. A. kergueleni (Stebb.) 1888 Amphithoe k., T. Stebbing in: ßep. Voy. 

 Challenger, u 29 p. 1116 t. 117 | 1893 A. rubricata (part.)?, A. Della Valle in: F. FL 

 Neapel, ».20 p. 463. 



9. Side-plate 1 much widened below. Pleon segment 3, postero- 

 lateral corners obtusely quadrate. General structure in close agreement with 

 A. rubricata. Eyes rounded ovaL Antenna 1, 2*^ Joint rather longer than 

 ist, 3d more than Ys as long as 2*^; flagelium much longer than peduncle, 

 33-jointed. Antenna 2 shorter, ultimate Joint of peduncle rather shorter 

 than penultimate; flagelium 20-jointed. Lower lip, front lobes bifid but less 

 sharply than in the European species. Maxilla 1, inner plate with many 

 plumose setae on inner margin; 2^ Joint of palp with 9 spine-teeth round 

 the apex. Gnathopod 1, 5*^^ Joint elongate, nearly as long as 6*^^, 6^^ oblong, 

 widening slightly towai-ds the rather oblique, finely pectinate palm, which 

 has a palmar spine at the rounded defining angle; finger overlapping palm, 

 its inner margin cut into 14 teeth. Gnathopod 2, 5*** Joint much shorter 

 than 6**^, distally cup-shaped, 6'^ rather broadly oblong; palm oblique, concave, 

 well defined; finger when touching the defining angle not closing the space 

 between its dentate margin and the palm. Other appendages nearly as in 

 A. rubricata. Telson broader than long, nan'owing to apex, which forms an 

 almost straight border between the acute corners. L. about 6 mm. — ö 

 unknown. 



Southern Indian Ocean (E.erguelen Island). 



14. A. japoniea (Stebb.) 1888 Amphithoe j., T. Stebbing in: ßep. Voy. Challenger, 

 V.29 p. 1124 t. 138 A | 1893 A. rtifcncato (pari), A. Della Yalle in: F. Fl. Neapel, i;.20p.456. 



9. Eyes small, irregularly round. Antenna 2, 2^ Joint longer than 1^*, 

 3^ about 7« as long as 2*^, carrying a little setuliferous (seemingiy jointed) 

 tubercle; flagelium much longer than peduncle, attaining to 46 joints. Antenna 2, 

 ultimate Joint of peduncle rather shorter than penultimate; flagelium longer 

 than both combined, 25-jointed. Mouth-parts as in A. rubricata. Gnatho- 

 pod 1, 5*^ Joint twice as long as broad, rather longer than 6*^^, 6*^^ oblong 

 oval, palm oblique, defined by a palmar spine at the rounded defining angle; 

 finger seiTate, a little overlapping the palm. Gnathopod 2, 5*^ Joint cup- 

 shaped, shorter but distally rather wider than the 6*^, 6*^ oblong, with a 

 convex palm, very slightly oblique, nearly matched by the finger, the apex 

 of which scarcely overlaps it. Peraeopods 1 and 2, 2* Joint long, not gi'eatly 

 widened. Peraeopod 3, 2*^ Joint as broad as long, 6*^ spinöse, its apex on 



