574 



sculpture of this area is less strong than on that species. The 

 girdle, while showii^g stains, is certainly a pale girdle. 



There are on three other cards marked "Peron et 

 Lesueur, lie King," one, two, and three specimens, respec- 

 tively. In all the sculpture is coarser than is the case with 

 the larger one on the card marked "type." While it is pos- 

 sible that some of them may be juvenile specimens of 

 Heterozona suh-vii'idis, Ire. and May, I could not distinguish 

 any pointed large scales that are so characteristic of that 

 species. 



/// conclusion. — This investigation determines the facts 

 that (1) Iredale was wrong in identifying the shell we used 

 to know as Ischnochifon contract its, Rv., and now known 

 as /. iredalei, Dup., with Blainville's Chiton Jineokitus. 

 (2) The larger specimen on the type card, which I accept as- 

 the type, is undoubtedly the shell we used to know as /. 

 crispxs, Rv. (3) While it is possible that some of the speciV 

 mens brought from King Island by Peron and Lesueur, and 

 mounted on the sej^arate cards may be juvenile forms of 

 H. sub-viridis, Ire. and May, their present condition makes 

 accurate determination difficult. 



Ischnochiton' f^Lejiidopleiirus) camj^heUi, Filhol. Type 

 (Comptes Rendus, xci., p. 1095, 1880). Iredale in Trans. 

 N. Z'd. Inst., vol. xlvii., 1914, p. 419. The type is from 

 Campbell Island and is a half-grown specimen similar to one 

 of the same size in my own collection. 



Ischn-ockiton mehmterus, Rochebrune. Type (Bull. Soc. 

 Philom., Paris, 1883-84, p. 137), from Campbell Island. 

 This is conspecific with the preceding species. 



Ischnochiton (Chiton) tesseUatits, Quoy et Gaimard. 

 Type (Voy. de TAstrol. Zool., iii., p. 396; Atlas, t. 75, 

 f. 43-47). This specimen is mounted on a card and marked 

 "II des Kangaroo," but in Pilsbry the locality is given 

 Port Carteret, New Ireland. On the back of the card there 

 is the note, "C. cj/inhium, Dufrizai. M.S.S.'' This shell has 

 girdle scales that are large, bead-like, polished, and almost 

 smooth at apex ; elsewhere very finely striated. Anterior and 

 posterior valves and lateral areas of median valves show 

 strong, slightly broken, radial ribs 5 or 6 in number. The 

 median areas closely packed with narrow, well-defined, wavy, 

 longitudinal ribs, curiously pectinated. I have never seen 

 this shell in Australia. 



lachnochiton (Chiton) sidcatus, Quoy et Gaimard. Type 

 (Voy. de I'Astrol., iii., p. 385, t. 75, f. 31-36). The card is 

 marked ''Gymno'plax urviUei^ Rochebrune" ; also "M. M., 

 Quoy et Gaimard. Type, from Port du Roi George." It 

 is a strongly-marked specimen of the shell we now know as 



