632 Ampithoe 



p. 268 I 1849 Ämphithöe, J.D.Dana in: Amer. J. Sei., ser. 2 t?.8 p. 137 | 1862 Amphithoe 

 (part.), Bäte, Cat. Amphip. Brit. Mus., p. 233 | 1888 A., T. Stebbing in: Rep. Voy. 

 Challenger, u29 p. 1113 | 1893 Am2)hithoe (part.), A. DellaValle in: F. Fl. Neapel, u 20 

 p. 454 I 1894 Amphithoe, G. 0. Sars, Crust. Norway, v.l p. 578 | 1836 Amphitoe, öuerin- 

 Meneville, Iconogr. Kfegne an., v.3 Crust. p. 23 | 1840 A. (part.), H. Milne Edwards, 

 Hist. nat. Crust., v.3 p. 28 | 1845 Amphitoe, H. Goodsir in: Ann. nat. Hist., i;. 15 p. 75 | 

 1852 Amphitoe, J. D. Dana in: P. Amer. Ac, v.2 p. 213. 



Head without rostrum. Side-plates 1 — 5 well developed, 5*^ as wide 

 as 4*^, with a very small Mnd lobe. Antenna 1 without accessory flagellum, 

 usually longer tban antenna 2, though with shorter peduncle. Mouth-parts 

 prominent below the head. Upper lip distally rounded. Lower lip (Fig. 108 

 p. 636), inner lobes well developed; outer lobes bifid; mandibular processes 

 prominent. Mandible nonnal, principal and secondaiy plate multidentate, 

 spines in spine-row numerous, molar of moderate size; 3^ Joint of palp 

 sometimes widened distally and crowded with setae, at others not widened 

 and slightly armed. Maxilla 1, inner plate very small, usually with 1 — 3 

 setae, outer plate with 10 spines; 2^ Joint of palp with several apical spines. 

 Maxilla 2, outer plate the larger, inner distally narrowed, inner margin 

 fringed. Maxillipeds, outer plates large, well fringed with spine-teeth; palp 

 not very elongate. Gnathopod 1 subchelate, usually the smaller. Guatho- 

 pod 2 usually subchelate, stronger in ö than in Q and generally of a 

 different shape. Peraeopods 1 and 2, 2^ Joint expanded, sometimes greatly, 

 for the cement-giands, the secretion from which issues through the apex 

 of the finger to supply fibres for constructive pui"poses. Peraeopods 4 and 5 

 longer than the others. Uropod 3, outer ramus carrying 2 reverted spines. 

 Telson short, usually or always having the angles of the apex minutely hooked. 



Among algae; occasionally also on floating algae. 

 17 accepted species, 14 obscure. 



Synopsis of accepted species: 



f Gnathopod 1 in (^ larger than gnathopod 2 . 1. A. megaloprotopus . p. 633 

 \ Gnathopod l in (5 smaller than gnathopod 2 — 2. 



f Gnathopod 2 in (5 chelate 2. A. lacertosa . . . . p. 633 



\ Gnathopod 2 in (J subchelate — 3. 



Peraeopods 1 and 2, character of 2d Joint not 

 known — 4. 



Peraeopods 1 and 2, 2d Joint broadly expand- 

 ed — 8. 



Peraeopods 1 and 2, 2d Joint not broadly ex- 

 panded — 11. 



Gnathopod 2 in cj, palm oblique — 5. 

 Gnathopod 2 in cj, palm transverse — 6. 



Gnathopod 2 in $ , palm with tubercle near 



finger-hinge 3. A. cinerea p. 634 



Gnathopod 2 in $ , palm with prominence at 



defining angle 4. A longimana . . . p. 634 



Gnathopod 2 in cj, palm simply concave . . 5. A. quadrimana . . . p. 635 

 Gnathopod 2 in (J, palm margin diversified — 7. 



Gnathopod 2 in cJ, palm with broad, low, 



median tooth 6. A valida p. 635 



Gnathopod 2 in (5, palm with narrow, bifid, 



median tooth 7. A. mitsukurii . . . p. 635 



