. ANILOCRID.E. 39 



cephalosome ; the anterior portion in front of the eyes is 

 smooth, with a narrowly rounded projecting rostrum, beneath 

 which lie concealed the first joints of the antennules (see 

 fig. 6). 



Plymouth (Leach and Biol. Lab.) ; Polperro (Laughrin, 

 fide Bate). 



ROCINELA DUMERILII (Lucas). (PL III. figs. 9, 10.) 



1845. Acherusia Dumerilii, Lucas, Anim. artic. d'Algerie, Crustace's, 



p. 79, pi. viii. fig. 5. 

 1879. Rodnela Dumerilii, Schiodte & Meinert, "Syrubolae ad 



Monog. Cyuiothoarum Crust. Isop. Fam. : I. ^Egidte," Naturhist. 



Tidssk. ser. 3, vol. xii. p. 391, pi. xii. figs. 4-9. 

 1904. Rodnela Dumerilii, Norman, " British Isopoda of the Families 



yEgidse, Cirolanidae, Idoteidas, and Arcturidae," Ann. & Mag. Nat. 



Hist. ser. 7, vol. xiv. p. 436. 



Near the Eddystone Lighthouse (Plymouth Biol. Lab. 

 1899). The specimen which came under our observation 

 was an adult male. The eyes are further apart than in the 

 last species, and the central area of the cephalon between the 

 eyes is raised considerably above their level, and is bounded 

 on each side by a rib which in one part forms a nodule ; in 

 front the rostrum projects forwards and is bent upwards, 

 while to the right and left of the rostrum are similar but 

 rather smaller, suberect processes, the front being thus as 

 described by Schiodte and Meinert : " Frons media excavata, 

 bicarinata, ante tridens, clente medio magno producto." The 

 figures here given of dorsal and lateral views will show the 

 form assumed ; but in younger specimens the cephalosome is 

 devoid of these processes, and closely resembles that of 

 R. danmoniensis. 



Fam. 4. ANILOCRID^E. 

 NEROCILA NEAPOLITANA, Schiodte & Meinert. 



1881. Nerodla neapolitana, Schiodte & Meinert, "Symbolse ad 

 Monog. Cyuiothoarum," Naturhist. Tidsskr. ser. 3, vol. xiii. p. 41 , 

 pi. ii. (Cym. ix.) figs. 9-16. 



Two or three years ago a specimen of this species was sent 

 to us for determination by the Director of the Marine 

 Biological Association at Plymouth. It had been taken five 

 or six miles south of the Mewstone. This is the first 

 occurrence of the genus in our seas. 



