POLYPLACOPHORA. 95 



Chiton furtivus Monterosato. Shell minute, flat, wide, smooth, 

 the lateral areas concentrically and subquadrately sculptured, little 

 elevated ; girdle covered with a delicate roughness. 



Length 7*5, width 4-5 mill. 



Palermo, in 20-30 fms. (Monts.) 



Chiton furtivus Monts., Not. Conch. Medit., p. 29 ; Nuova 

 Rivista etc., p. 21 ; Jouru. Conch. 1878, p. 147. — Carus, Prodr. 

 Faun. Med. ii, p. 179. 



Chiton minimus Monterosato. Shell small, convex, elongated ; 

 surface puncticulate-perforate; lateral areas little elevated. Girdle, 

 seen under a lens, most minutely and irregularly scaly. 



Length 5, width 3 mill. 



Gulf of Lyons (Martin) ; Marseilles (Marion) ; Palermo (Monts.) ; 

 Dalmatian littoral (Brusina). 



C. minimiis Monts., Carus Prodr. Faun. Med. ii, p. 180. 



Chiton pachylasm^ (Seguenza MS.) Monterosato. Shell 

 minute, rough, the lateral areas strongly elevated ; posterior valve 

 7-radiate, anterior valve scabrous. Girdle very minutely gravelly 

 under a lens. Length 5-6, width 3*5 mill. 



Straits of Messina (Seguenza). 



Ch. pachylasmce (Seg.) Monts., Carus, Prodr. Faun. Med. ii, p. 

 180. 



Chiton stigma O. G. Costa, Cat. Sist. e Ragionato de' Test, 

 della due Sicil., pp. i, iv, t. 1, f. 5 (1829). A larval shell ! 



Gymnoplax senegalensis Rochebr. Shell oblong ovate, car- 

 inated; rather whitish with sparse rufescent spots. Anterior valve 

 smooth. Anterior area of the posterior valve and central areas of 

 the intermediate valves longitudinally deeply sulcate; lateral areas 

 smooth, bi-lirate at the base. Marginal ligament wide, granose, pale 

 rose. Length 24, width 10 mill. {Rochebr. in Bull. Soc. Philom. 

 Paris, 1880-81, p. 118 ; Lojjhyrus senegalensis Rochebr., Journ. de 

 Conch. 1881, p. 42.) 



Bocks of Dakar ; Promontory of Cape Verde ; Madeline Is. Rare. 

 Paris Mus. 



Probably a synonym of Chiton canariensis Orb. 



Tonicia gambiensis Rochebrune. Shell elliptical, wide, sub- 

 carinated, roseate painted with blackish spots ; anterior valve and 

 anterior part [sic] of the posterior valve radially granose ; inter- 



