76 PROCEEDINGS OF THE ACADEMY OP [1894. 



1882. — Aeanfhoehites jucundas Rocliebrune, t. c, p. 194. New 



Holland (Belligny). 

 1884. — Chiton. (A'-antko;'hito)i) asbedoldes Cpr. MvS., E. A. Smith, 



Zool. "Alert" p. 88. Port Molle (Coppiuger). 

 1894. — Ae((nthocJiites {Metin-ojjlax) retrojectus Pilsbry, Nautilus, p. 



107. Port Jackson (Cox). 

 1894. — Aranthorhitet^ grrniosfriatus Pilsbry, Nautilus, p. 119. Port 



Jackson and Port Hackino- (Cox). 

 1894. — Aeanfhoehites Co.r/ Pilsbry, Nautilus, p. 119. Port Jackson 



(Cox). 

 1894. — Acanfhochifes Mattketosi Bednall & Pilsbry, Nautilus, p. 119, 



S. Australia (Matthews). 



Of these seventeen species, the four described by de Blainville 

 have not been recognized, and without an examination of the types 

 they cannot, in my opinion, be really known. The three species 

 described by Dr. Rochebrune will also prove difficult to identify, 

 although A. jiu'iindiis will probably be recognized by its peculiar 

 coloration. Most of these species of Blainville and Rochebrune were 

 founded upon specimens collected in the early part of the century 

 and no locality more exact than "New Holland" is stated. It must 

 be remembered that even this vague geographical information is not 

 to be considered conclusive. Some early voyagers have been known 

 to get the localities of their shells mixed. 



The remaining species are known to be Australian; but two of 

 them, H. earinatns and A. scidigtr, must be rejected ; the first be- 

 cause the name is preoccupied by Risso (Aranthochites rariiKitus 

 Risso, Hist. Nat. Eur. Merid., IV, p. 169. 1826), the other because 

 it is founded upon an incorrect identification. 



We have, therefore, eight recognizable species of AcaiithocJiites 

 from this region, if we include " Hanlei/<i " varwhilis which is un- 

 known to me autoptically. To this number, one more is herein 

 added. 



The Australian Acaiithochites fall into four subgenera or sections, 

 distinguished by the following characters : 

 II. Anterior valve having five strong radiating ribs, lobing the 

 periphery of the tegmentum; tail valve with several slits. 



Loboplax 

 aa. Anterior valve without radial ribs, the lower margin of the 

 tegmentum not obviously lobed 

 b. Valve viii having the mucro posterior, its insertion- plate 



