* * This divide into three siil>MTtim~ : 



f A. nnbi/iit (I ray. [EudoXOCMtOH.'] 



ft A.pioia Sow., *i>in ii/ci-'i S>\v., MMfiti Gray, j^xosa Brug., 



/;// S I'jti'ifirn ( I ray. [ ,!/'/"'/'//'/.] 



ftt A. f git/"* (imel. [=Dwi0p four] ; A. f trum-titn. [=2W- 

 toio.] 



Neitlicr of these sections is selected by Gray as typical ; but in his 

 " List of the Genera of Recent Mollusca, their synonyma and types " 

 P. Z. 8. 1847, he gives on p. 168, no. 413, " Acanthopkura (iuild. 

 1835; Gray, 1847. Canthapleura Swains., 1840. Ch. 8pin< 

 It appears then that not only Swainson, but Gray himself selects C. 

 yi nn*u * as the type species. 



1853. SHUTTI, i:\voiiTir, in a most scholarly essay, divided Gray's 

 Acautho/ilenra of 1847 into three sections: Chcetopleura [equivalent 

 to Gray's sect. * and part of f t t> an d including C. rugosu* (Gray) 

 Sowb., per n vi<nuis Lm., gigas Chem.] ; Eudoxochiton [for C. nobilis 

 Gray] ; and Acanthopleura, restricted, [equal to Gray's Acantho- 

 j>[> ura sect, f t pl us Corephium, with some other miscellaneous 

 species]. 



In 1856, GRAY again made a cruel onslaught upon the genus; 

 and here he restricts Acanthopleura to the sect. * of his 1847 

 arrangement, ignoring the fact that Shuttleworth had meantime 

 given a new name, Chceto})leura, to that section, and apparently 

 forgetting that he had himself said in a former paper that C. spinosus 

 was the type of Acanthopleura ! In the same paper, he proposes a 

 new genus, Minnjrriit, for the following species, which he arranges in 

 two sections: f> M- nobilis {_= Eudoxochiton Shuttl. 1853]. ft* 

 ^[. /n'rc'i Sow., ,*/>! a iyera Sow., oiven.ii, a/nnosa Sow., brevispinota 

 Sow., magnified Sow., C. 111., f. 52. He also retains his genus Core- 

 phium for C echinatum Sow., 111., f. 47. 



1858. Messrs Adams, in their Genera, reunite Acanthopleura and 

 Coreplu'inn, with a choice assortment of other forms, under the 

 genus " Chiton /,in turns." As the status of this generic name has 

 been fully discussed by me on p. lf)0, comment here would be super- 

 fluous. 



1873-1882. Carpenter, in his MS. arrangement of Chiton* (an 

 abstract of which was published by Dall, Proc. U. S. Nat. Mus. 1881, 

 p. 284, 287), proposes to retain the name Acantkoplevra for the 

 group of Ch. piceus; Corephium for C. echinatus ; and T 7 /'/ 

 Cpr., ?ioi'., for Ch. spinosus. This arrangement is not acceptable 



