ISCHNOCHITON. 95 



Lepidopleurus specionus. Shell lengthened, tawny, back orna- 

 mented longitudinally with red-brown, the margin with a wide con- 

 centric green zone. End valves and lateral areas concentrically 

 ribbed, the ribs pustulose, interstices minutely granulated. Lateral 

 areas somewhat elevated. Median valves carinated. Dorsal areas 

 divaricately wrinkle-striated. Girdle pale brown, covered with 

 closely imbricating scales. Length 35, breadth 20 mill. {Ad. & 

 Aug.} 



Port Lincoln. 



This is an excellent description of the exterior of this species. 

 I. COLUBRIFER Reeve. PL 21, figs. 51, 52. 



Shell oblong-ovate, somewhat elevated in the middle. Terminal 

 valves and lateral areas peculiarly flat-grained, central areas very 

 finely reticulated with circular and oblique striae. Whitish blotched 

 with black ; ligament scaly. (Reeve.} 



Habitat unknown. 



C. colubrifer REEVE, Conch. Icon. t. 28, f. 188, Jan., 1848. Isch- 

 nochiton colubrifer CPU., MS. 



Carpenter writes : Three specimens, Mus. Cuming. Very like a 

 young variety of the castus group. Shell arched, not keeled, ele- 

 vated ; ashy, spotted with dark here and there, tinged with orange 

 about the umbos, which are not beaked. Central areas, and the 

 undiflerentiated jugal areas, covered with a minute granulation, 

 running perpendicular to the diagonal line and then branching off 

 into wrinkles. Lateral areas and end valves having granulations 

 running into coarse concentric wrinkles. Posterior valve having 

 10, central valves 1, anterior valve 9 slits; teeth extremely sharp 

 and fine ; sinus broad, deep, smooth, deeply channelled at the sides ; 

 eaves long, solid. Girdle having typical Ischnoid scales, rather 

 large, flat, broad, thin, regularly imbricated, very finely striated. 



Length 16, breadth 7 mill.; divergence about 83. 



I. PALLIDULUS Reeve. PI. 23, figs. 96, 97. 



Shell elongated ; terminal valves and lateral areas concentrically 

 undulately wrinkled; central areas minutely rough; whitish 

 throughout ; ligament horny, arenaceous, whitish. (jR-ye.) 



Habitat unknown. 



C. pallidulus REEVE, Conch. Icon. t. 20, f. 131, May, 1847. 

 Ischnochiton pallidulus CPU., MS. 



