580 



Hist. Nat., 1917, No. 7, p. 1, 2), and I.e., p. 7, 1918. These- 

 latter point out that in the Paris Museum are two specimens 

 collected by Peron ; the one marked type, which I call (a), 

 is conspecific with Liolophura (Chitoiv) georgiana, Quoy et- 

 Gaim. The other, which I call (b), is marked co-type, was- 

 identified by Dr. Thiele as conspecific with Acanthopleura 

 spiniger, Sow. The following are my notes on the type speci- 

 men, which is disarticulated. The card is marked "Chitom 

 liirtosus, Yeron = Chifont georgianus, Quoy et Gaimard, He 

 King" ; and has labels at the back which read, "See pg. 533, 

 Bull, du Mus. d'Histoire Nat. (in Blainville's handwriting),. 

 hirtosus, Bl."; in Peron's handwriting, "Jiirtosv-?, He King"; 

 and in Quoy or Gaimard's handwriting, ''Aculiatum." 



The large median valve measures laterally 30 mm. The 

 sculpture is almost entirely eroded, broken and beaded growth- 

 lines are slightly visible in the lateral areas, and what little 

 sculpture remains on the rest of the valve consists of concentrie 

 ridges. Tlie anterior valve is slit and propped, but the insertion 

 plate is absent or modified in the manner characteristic of Z. 

 georgiana, Quoy et Gaim.; the girdle scales are also similar 

 to that species. There is a note on the back of the card,. 

 "Dr. Thiele det. this is undoubtedly Quoy et Gaimard's 

 shell." In this determination I fully concur. I have na 

 doubt the specimen came from Port du Poi George, and not 

 from He King, as marked on card; but until a careful search 

 for Chitofi.s be made on that island, the locality from whicli 

 the type came must remain an open question. 



Specimen (hj. 



The card is marked "Co-type, Chifo/i hirfosti.^, (Perou) 

 Blainville. M. M. Peron et Lesueur, 1803, I. King, M^ 886 

 = A cantho pleura splntgera. Sow." On back it has the fol- 

 lowing notes, "He King, Chiton hirtosus, Peron, 233," in 

 Peron's handwriting; two words that look like "Leplus 

 grand, A. acideata., L., I. King," in Lamarck's hand- 

 writing, and ''Acanthopleura spimgera. Sow,, Tliiele det." 

 Tliis specimen is similar in sculpture and spicules to specimens 

 in my collection from Port Darwin which I have considered 

 are referable to Blainville's Chitov gemmala. The shell is 

 a good deal curled but is in good preservation and measures 

 51 X 38 mm. This could not have come from He King, but 

 possibly Baudin sailed north as far as Shark Bay, where this 

 Acanthopleura occurs. Is it not possible that this is the 

 missing type of Blainville's Chiton gemmatus? Up to the 

 present I have not been able to refer to the original descrip- 

 tion of that species. 



