646 Sunamphitoe, Biancolina 



Side-plates 1 — 4 with setules at lower bind corner; side-plate 1 scarcely 

 produced forward, 5*^ the largest. Body smooth, compressed. Head, lateral 

 lobes broadly rounded. Pleon segment 3, postero-lateral corners obtusely 

 quadrate. Eyes small, rounded, red. Antenna 1 longer tban antenna 2; 

 1»* Joint the largest, 3^ small; fiagellura elongate, in ö reachiug more than 

 40joints. Antenna 2, ultimate Joint of peduncle shorter than penultimate, 

 flagellum shorter than peduncle, in d reaching 17 setose joints. Mandible 

 just as in Ampithoe rubricata (p. 639), except for absence of palp. Gnathopod 1, 

 2^ Joint apically a little widened, 5*^ distally widened, 6*^ rather longer 

 than 5*^, oblong; palm transverse, short; finger projecting beyond palm, 

 faintly serrate. Gnathopod 2 in d, o^^ Joint cup-shaped, short, its bind 

 lobe narrow, 6*^ large, oblong oval, a setose lobe or tubercle projecting 

 near hinge of finger, and from this the microscopically denticulate palm 

 joining or forming the bind margin without defining point; the long, 

 slightly siuuous finger about ^/^ as -long as 6**^ Joint. Gnathopod 2 in Q 

 like gnathopod 1, but with 5^^ Joint shorter, and 6^^ rather broader. Peraeo- 

 pods 1 and 2, 2'^ Joint broadly oval, 4^^ about as broad as long; finger blunt 

 at tip. l^eraeopod 3, 2*^ Joint broader than long, 4*^ and 5*^ shorter than 6*^^. 

 Peraeopods 4 and 5, 2'^ Joint oblong oval, narrowing a little distally, 4*^ — 6**^ 

 joints moderately long. In peraeopods 3 — 5 the finger is curved, its inner 

 margin marked as if for serration, of the apical spines on the 6^^^ Joint one 

 follows the curve of the finger (Bäte in 1857 describes these limbs as 

 scarcely prehensile in 5. hamulus). Pleopods 1 — 3 with 3 coupling spines. Uro- 

 pods 1 and 2, rami not very long. Üropod 3, outer ramus microscopically 

 denticulate on upper margin, of the upturned spines the apical the smaller, 

 inner ramus with sevei-al setules and 2 spinules. Telson broader than long, 

 with a little tubercle or upturned point on either side of triangulär apex. 

 Colour greenish yellow with stellate markings. L. 8 — 17 mm. 



North-Atlantic, North-Sea and English Channel (Norway; France; North and 

 South Devon, between tide-marks; Azores). 



6. Gen. Biancolina Della Valle 



1893 Bimicolina (Sp. un.: B. algicola), A. Della Valle in: F. Fl. Neapel, v. 20 p. 562. 



Antenna 1 longer than antenna 2, without accessory flagellum, flagellum 

 longer than peduncle. Upper lip rounded as in Ampithoe (p. 631). Lower 

 lip, outer lobes iudented on outer not on inner margin, inner lobes distinct 

 to the base, little divergent apically. Mandible short, cutting edge with 

 about 10 unequal teeth; accessory plate with 4 or 5 teeth, smaller on right than 

 on left mandible, spine-row of 3 or 4 minute spines; molar evanescent; 

 palp wholly wanting. Maxilla 1 powerful, inner plate small, with 1 seta, 

 outer long, with 9 spines so crowded as to make the counting rather 

 uncertain. Maxilla 2, both plates slender, feebly armed, outer a little the 

 longer and broader. Maxillipeds, inner plates rather long and nan'ow on 

 elongate base, outer reaching beyond 2^ Joint of palp, armed with few but 

 strong spine-teeth; palp's joints 1 — 3 short, stout; finger small, conical, with 

 well formed nail. Gnathopod 1 forming a small imperfect chela. Gnathopod 2 

 massive, subchelate. Peraeopods 1 — 5, 2^ Joint somewhat expanded, finger 

 curved. Peraeopod 3, 6*^ Joint reverted. Uropod 3, peduncle stout, rami 

 short, lamellar, outer with 2 hooks. Telson small. 



1 species. 



