127 



* Scales of manlle trunsversely grooved. 

 Ischnochiton textilis. Chiton textilis, Gray = Ch. longicymba, 

 Blainv. 



Ischnochiton limaciformis. Chiton limaciformis. West Indies. 

 Ischnochiton Magdaliensis. Chiton Magdaliensis, Hinds. 

 Ischnochiton alatus. Chiton alatus, Soįv. Philippines. 



** Scales of mantle minute, granule-like. 

 Ischnochiton marginatus. Chiton marginatus, Mont. Ch. cine- 

 reus, Lowe, Z. J. 



• -r. nEPTOCHITON. 



The valves ropnded, thiu ; posterior valve entire : the platės of 

 insertion rudimentary, without any notches on either the terminai 

 or centrai valves. Manjclę covered with granular scales. 



Leptochiton cinereus. Chiton cinereus, Montague = Ch. asellus, 

 Lome, Zool. Jour. var. ■white, Chitonalbus. 



Leptochiton Hanleyi, Chiton Hanleyi, Bean. 



Leptochiton cajetanus. Chiton cajetanus. Poli. Lepidopleurus 

 cajetanus, Risso. 



Should the form of the platės of insertion of any specimen not be 

 sufficiently seen, they may be easily made visible through the inner 

 side of the mantle by their being soaked a few hours in a weak solu- 

 tion of caustic potash, but care should be taken that they are not left 

 too long in soak, nor the solutionAje too strong, otherwise the margin 

 will be dissolved. But should taB valves be wished to be kept sepa- 

 rate, this is the best way of sepallting them, as the platės of insertion 

 are cleaned, and not broken, as 0ey are Ūkely to be if taken from the 

 mantle. I may remark that th| number of notches in the platės of 

 insertion is sometimes, but as far as I have observed, very rarely, 

 liable to variation ; in one specimen of Chiton Boivenii I have observed 

 that the plate of insertion of the lašt valve but one has two notches 

 on one side, but tlie normai single one of the genus on the other. 



The Meetings of the Society were then adjoumed to 

 November 9th. 



