Isaea, Ampithoidae, Ampithoe 631 



3^ Joint of palp as long as 2*^. Maxilla 1, inner plate with pointed apex, 

 and no conspicuous seta. Maxilla 2, inner plate fringed. Maxillipeds well 

 armed, fiuger as long as 3^ Joint. Gnathopod 1 small, 5*^ Joint as long as 

 the oval 6*^; finger matching the oblique convex palm. Gnathopod 2, 5*^ Joint 

 cup-shaped, 6*^ robust, palmar margin rather oblique, divided into 4 teeth; 

 finger robust. Peraeopods 1 and 2, 2^ Joint narrow. Peraeopods 3 — 5, 2^ Joint 

 well expanded, especially in peraeopod 3. lu all peraeopods the dilated 

 6*^ Joint has a sort of oblique, serrate palm, set with strong spines, whereby 

 these limbs acquii'e a subchelate character. Uropods 1 — 3, rami subequal, 

 spinöse, üropod 3 the shortest, the slender pointed rami about as long as 

 peduncle. Telson shorter than peduncle of uropod 3, its apex rather abruptly 

 pointed. Colour reddish yellow, more or less in transverse bands. L. 5 mm. 



North-Atlantic and Mediterraaean (from Great ßritain to the Adriatic). On 

 Mamaia squinado (Herbst). 



36. Farn. Ampithoidae 



1899 Amphithoidae, T. Stebbing in: Ann. nat. Hist., ser. 7 v.4: p. 211. 



Head, lateral lobes not very prominent. Side-plates regulär; 4*^ with 

 bind margin not excavate; 5*^ with broad front lobe, as deep as 4*^ (Fig. 109 

 p. 642). Antenna 1 with 3^ Joint short; accessory flagellum wanting or 

 small. Lower lip (Fig. 108 p. 636) with front lobes deeply notched. 

 Mandibular palp stout, slender, or wanting; molar usually well developed. 

 Mouth-parts otherwise as in Aoridae (p. 585). Gnathopods 1 and 2 not simple, 

 2 ^ usually the larger, usually larger in ö than in 9 and more or less differently 

 shaped. Peraeopods 1 and 2 glandulär. Peraeopod 3 reverted. Peraeo- 

 pod 5 the longest. Uropods 1 — 3 biramous. üropod 3 with short rami, 

 the outer uncinate. Telson simple (Fig. 110 p. 643). 



3Iarine. 



6 genera, 22 accepted species and 19 doubtful. 



Synopsis of genera: 



1 



Mandible with palp — 2. 

 Mandible without palp - — 5. 



I Antenna 1 (Fig. 109) without accessory fla- 

 gellum — 3. 

 Antenna 1 with accessory flagellum — 4. 

 {Peraeopods 3— 5, öth Joint not strongly widened 

 at apex 1. Gen. Ampithoe . . . p. 631 

 Peraeopods 3 — 5 (Fig. 109), 6tli Joint strongly 

 widened at apex 2. Gen. Pleonexes . . . p. 642 



t I Uropod 3, outer ramus with 2 hooks .... 3. Gen. Grubia . . . . p. 644 



Uropod 3, outer ramus with 1 hook .... 4. Gen. Amphithoides . p. 645 



Mandible, molar well developed 5. Gen. Sunamphitoe . p. 645 



Mandible, molar evanescent 6. Gen. Biancolina . . p. 646 



1. Gen. Ampithoe Leach 



181 3/14 Ampithoe (Sp. un.: A. rubricata), Leach in: Edinb. Enc, v.7 p. 403, 432 | 

 1829 Amjnthoe, Latreille in: G. Cuvier, Kegne an., n. ed. r. 4 p. 121 | 1816 Cymadusa 

 (Sp. un.: C. filosa), Savigny, Mem. An. s. Vert., v.l p. 109 | 1816 Amphithoe, Latreille 

 in: Nouv. Dict., ed. 2 v.l p. 470 | 1825 Amphithoe, A. G. Desmarest, Consid. gen. Crust., 



