LEPIDOPLEURUS. 15 



Girdle narrow, closely beset with delicate elongated, striated 

 scales. 



Length 10, breadth 7 mill. ; divergence 130. 



Mogador. 



Leptochiton granoliratus CPR. MS. p. 3. 



This species may easily be distinguished from L. asellas by its 

 strong concentric wrinkles and the low, rounded arching of the 

 back. 



L. CAJETANUS Poli. PL 2, figs. 41-46. 



Shell oblong, elevated, solid. Valves regularly arched, the lateral 

 areas very strongly raised, coarsely sculptured. 



The median areas of the valves are sculptured with longitudinal 

 lirse, which are granulous and anastomose or branch irregularly. 

 The head valve has strong concentric ridges, 7 to 10 in number in 

 adults, the intervals being finely pitted or granose. The lateral 

 areas of the intermediate valves are very much raised, and sculp- 

 tured with concentric ridges like the head valve. The posterior 

 valve is very solid and thick, its apex posterior but recurved for- 

 ward and much elevated ; its posterior slope is subvertical, convex, 

 terraced. 



The sutural plates are triangular and stout; the jugal sinus 

 rather narrow. Insertion plates are completely lacking. It is 

 lusterless, and light buff in color. 



Girdle very narrow and thin, bearing most minute, close delicate 

 deciduous scales. 



Length 23, breadth 12 mill. 



Length 11, breadth 6 mill. 



Mediterranean and Adriatic Seas; Atlantic Ocean from Cape 

 Breton to the Gulf of Gascony ; Canaries ; Pliocene of Biot {Mar- 

 itime Alps^), of Calabria and Modenais; Pleistocene of Monte 

 Pellegrino. 



Ch. cajetanus POLI, Test. utr. Sicil., i, t. 4, f. 1, 2, 1791. PHIL. 

 Enum. Moll. Sicil. i, p. 108, ii, p. 83. WEINKAUFF, Conch, des 

 Mittelm, ii, p. 412. REEVE, Conch, Icon. f. 171. Lepidopleurus 

 cayetanus Poli, Risso, Hist. Eur. Merid. iv, p. 267. Ch. caietanus 

 Poli, JEFFR., P. Z. S. 1882, p. 667. Leptochiton cajetanus Poli, 

 CPR. mss. p. 7. Holochiton cajetanus Poli, BUQUOY, DAUTZENBERG 

 and DOLLFUS, Moll. Mar. Roussillou, i, p. 500, t. 61, f. 1-3 ; t. 62, 

 f. 5. 



