46 



markings, silvery inside. Long. 23, lat. 19, alt. 6|. Very variable. Rare. 

 E. Coast only, and in N. Zealand. A doubtful identification. 



Chiton (lophykus) austbalis. Mag. Nat. Hist, 1840, Conch. Ulust., 

 fig. 46, and probably fig. 139 ; Beeve, pi. 2, Jig. 10. An oblong rounded 

 form of dark green color, with the lateral areas radiately ridged ; margin 

 bordered Avith small scales. The genus Lophyrus was proposed by Poli 

 (Testacea utrimque, SicilicB, 1791 to 1795) for Chitons with the borders of 

 the mantle covered with rounded scales regularly imbricated. I do not 

 know of any other reliable species, though I would easily assign certain 

 varieties, or very young or worn shells to the following species : — Con- 

 ceniricus, muricatus, smaragdinus. The Chitons vary wonderfully in color 

 according to their age, and according to the rock to which they adhere to 

 vrhich they are in a remarkable manner assimilated. 



Chiton (lepidopleueus) liratus. Ad. and Angas, Zool. Proc, 1864, 

 2». 193. A small, somewhat pale shell, with undulating decussate striae, the 

 back of the valves being like an engine-turned watch. 



Chiton (lepidopleueus) speciosus. Ad. and Ang. loc. cit., p. 192. It 

 is with very considerable diffidence that I differ from such high authorities, 

 but I woiild suggest that this and the preceding are varieties of C. ustulatus, 

 Quoy. Voy. Astrol, Vol. 3, p. Z9B,pl. 75, Jigs. 19, 24. And I must frankly 

 repeat my opinion already given, that I beHeve we have very few species of 

 Chiton, instead of the number which naturalists have described, and that 

 they are very variable and world-wide in their distribution. We might 

 have hundreds more than the himdreds we have, if we were to take fairly 

 into account the endless varieties of color, form, or marking to which 

 different individuals of the same species are subject. The following species 

 have also been attributed to Tasmania, though, as I have failed to trace 

 them, I shall merely give the names and authorities. 



Chiton piceus. Gmel. 



Chiton peoteus. Reeve. 



Chiton sinclaiei. Gray in DiefenhacKs Travels^ Vol. 2, p. 263. A 

 New Zealand shell whose Tasmanian habitat is doubtful. 



Chiton glaucus. Gray. 



Chiton (planifora) petholatus. Sow. Mag. Nat. Hist., 1840. A large 

 greenish-blue species, with a rough coarsely hirsute margin. The interior of 

 the valves a transparent light blue, while exteriorly they are finely 

 granulated in tmdulating lines. I am perfectly confident that with this 

 species must be united C. ( Plaxiphora) ciliata, Sow., Conch. Illust.,p. 79.) 

 Absolutely the only differences are the age and size by which the external 

 markings are changed. I do not pronounce this opinion hastily, as it is 

 nearly 20 years since I first became acquainted with the species, and have 

 examined hundreds of specimens from all the S.A. Coasts south of the 

 Murray, Portland Bay, Bass' Straits, and Tasmania. 



Chiton (acanthoch^les) zelandius. Quoy, Voy. de VAstrol, Vol. 3» 

 p. 400. A species with little tufts of transparent spiculse at the base of each 

 plate. Isthmus Bay from 30 to 50 mill, long., common. I believe this 

 shell to be identical with C. crinitas, Pennant, and C. fascicularis, the first 

 of Britain, the second of the Mediterranean. 



Crtptoplax gunni. Reeve, Icon. Jig. 5 (as Chitonellus). From 1 to 2 

 inches long. N., common, and S.A. 



Cryptoplax spinosa. H. Adams, Zool. Pro., 1861, p. 385. Animal 

 with a large mantle and spinous plates, with a broad smooth central ridge. 

 Long. 88, lat. 25. 



Siphonaeia dieivl^nensis. Quoy. Voy. de VAstrol, Vol. 2, p. 327, v^ 25, 

 fig, 1, etc. Sharply conical, radiately white ribbed, interstices rich browb, 



