36 PEOCEEDINGS OF THE MALACOLOGICAL SOCIF.TY. 



C. onyx was described four pages earlier in the same paper ' as C. 

 asellus. Tlici'e is, it is true, a description of C. asellus in Martini and 

 Chemnitz, vol. viii. (1785), but these authors were not at tliis date 

 binomial, and therefore the name must stand or fall by Spengler's 

 description, which is subsequent to that of oni/x. Jeffreys suggested 

 that C. onyx was the same as C. Itissoi, Payr., but the one was de- 

 scribed from Norway while the other is a Mediterranean species. He 

 recorded C. Itissoi from the west of Scotland, and this I think must 

 have been an error. I have had specimens sent me under this name 

 from the Channel Islands, but they only proved to be C. onyx 

 [ = asellus). 



Ilanleya Hanleyi., Bean, 1844. PI. III. Fig. 1. Gray in 1857 

 altered the name to Chiton dehilis, on the ground, I presume, of a 

 British Association rule which then existed, but which has now been 

 abandoned. 



Tonicclla marmorea, Fabr., 1780. PI. III. Fig. 9. Pilsbry, in his 

 synonymy of this species, gives '■'■punciatus, Strom, {fide Jeifreys), Acta 

 Mdr. iii. p. 433. " After much difficulty I found that Acta Kidr. 

 (=Acta IS^idrosia) is a misleading abbreviation, apparently invented 

 by Agassiz in his ' Bibliogra])hia Zoologisc ' for " l)et Tronthicmske 

 Selkskabs Skriftcr." The reference should also be to p. 434, not p. 433. 

 On turning to the work we lind that it is only punctatHS, Linn., and 

 since th;it is stated by Hanley to be undeterminable it need not 

 trouble us. 



Tonicclla ruber, Linn., 17G7. PI. III. Fig. 12. I am unable to 

 follow ]\lr. Pilsbry in placing this species in Trachydermon. The 

 strife radiating from the notches in the insertion plates become in this 

 and the last species rows of punctures. This feature appears in all 

 the species of Tonicclla which I have been able to examine, while I 

 cannot find it in any Trachydermon. Prof. Sars created a section, 

 Boreochiton (1878), to contain B. ruber and B. marmoreus. It might 

 be convenient to use this term as a section of Tonicclla for T. ruber, 

 which, though it is nearer to the latter than to 'Trachydermon, shows 

 some of the characters of both.- 



Calluchilon lavis, Montagu, 1803. PI. III. Fig. 8. 



2'rachydermon cinereus, Linn., 1707. PI. 111. Fig. 11. See notes 

 under Lcpidopleurus onyx. 



Tracliydermon albus, Linn., 1707. PI. III. Fig. 10. 



ylcanthochites fascicular is, Linn., 1707. PI. 111. Fig. 5. 



Acanthochites discrcpans. Brown, 1845. PI. III. Fig. 0. Despite 

 Brown's deceptive figui-e and incorrect locality I think he intended 

 this species as wc know it. 



' Skriv. Nat. Selsk. iv. (see pp. 95, 99). 



2 iSiiifc fliis paiMi- was wiittdi iind nad Pilshry lias piiblisliod another part of the 

 Mnmial (vol. .\v. ])t. 1), ami in this he raisis Tr(nIitj(ltr)iion I'rom a sub-gjenus 

 to a fi( nils, and Ji<,itot/ii/oii tidiii a synonym to a section of Traihychrmou. lie also 

 eliminates iiiuriiiorcus lioni litinoc/ii/o/i and places it in Tonicella; placing in Boreo- 

 chilon only ruber, punicvus, and SStcinenii. 



