ISCHNOCHITON. 89 



must be said, however, that the confusion of these two species has 

 probably been due to the lack of specimens from the two localities 

 for comparison; else the differences would hardly have escaped 

 writers so careful and observant as Carpenter and Haddon. 



I. CRISPUS Reeve. PI. 24, figs. 98, 99 (enlarged). 



Shell rather elongately ovate ; terminal valves and lateral areas 

 of the rest finely decussately granulately crisped, central areas 

 smooth, or under the lens very minutely reticulated. Olive-green, 

 thickly painted with dots of a darker color. Ligament minutely 

 granulously coriaceous, obscurely tessellated. (Reeve.) 



Australia. 



C. crispus RVE., Conch. Icon. t. 19, f. 120, May, 1847. 



Allied to C. longicymba, but distinguished from that by the min- 

 ute decussated character of the sculpture of the lateral areas. 

 (Eve.) 



Carpenter seems to think this simply a pale variety of C. longi- 

 cymba, saying that he cannot see the decussation spoken of by 

 Reeve, unless it is from the concentric ribs of growth seen in some 

 of the specimens. 



In view of the inadequate description and figure, the species had 

 better be dropped. 



I. PALLIDUS Reeve. PI. 23, fig. 91 (enlarged). 



Shell oblong-ovate, valves smooth throughout ; dead white ; lig- 

 ament horny, arenaceous, brown. (Reeve.) 



A ustralia. 



C. pallidus REEVE, Conch. Icon. t. 16, f. 92, March, 1847. Isch. 

 pallidm CPU., MS. 



Carpenter's notes on the specimens in the British Museum are as 

 follows, but I am not sure that these are Reeve's species : Shell 

 almost exactly like I. longicymba, gothic-arched ; whitish, ashen, or 

 variously tinged or streaked with roseate, blue and olivaceous; 

 jugal area scarcely defined, jugum obtuse ; central areas wrinkle- 

 striated, the wrinkles irregularly tending forward toward the jugum, 

 sometimes v-shaped; lateral areas well-defined, having 12-30 gran- 

 ulate-wrinkled striae, sometimes the wrinkles, sometimes the gran- 

 ules predominating, sometimes having concentric growth wrinkles. 

 Mucro median, rather elevated, the slope behind it little concave. 

 Interior : front valve with 11, central 1, posterior valve 13 slits ; teeth 



