428 ON THE OCCURRENCE OF PLECOTREMA, ETC., IN PORT JACKSON, 



but I cannot find a specimen which has come from there ; further, 

 Carpenter makes no allusion to this species existing in Angas's 

 collection, which he examined critically, as from New South 

 Wales. 



Is it possible that the name Plaxiphora ylauca of Q. et G., also 

 described by Q. et G. in 1834 in the Voyage de 1' Astrolabe, Zool. 

 iii. p. 376, pi. Lxxiv. figs. 7-11, has got mixed up with the smooth 

 glaucous species from New Zealand? The true P. glauca was 

 ori^^inally procured at D'Entrecasteaux Channel, Tasmania, a 

 species, says PiLsbry, "evidently allied to Plaxijyhora 'petholata ; 

 it is probably the form Angas collected at Guichen Bay in South 

 Australia, and was listed by him P. ciliata.'" 



Angas remarks that it is the largest of the South Australian 

 Chitonidce. 



Chiton pellis-serpentis, Quoy et Gaimard. 



This species, originally described in the Voyage de 1 'Astrolabe, 

 Zool. iii. Moll. p. 381, pi. lxxiv. figs. 17-22, 1834, has hitherto not 

 been recorded as being found in Port Jackson or the neiglibouring 

 parts of the N. S. Wales coasts. I have found it recently in 

 considerable numbers in Port Jackson and at Port Hacking. 



Its home seems to be New Zealand, where it is said to be one 

 of the most abundant of the Chitons found on those shores. It is 

 not in Angas's List of the Marine Mollusca found in Port Jack- 

 son, published in 1867 in Proc. Zool. Soc. p. 185, nor is it recorded 

 in Whitelegge's List of the Marine and Fresh-Water Invertebrata 

 of Port Jackson and Neighbourhood, published in the Journal and 

 Proceedings of the Royal Society of N. S. Wales for 1889. 



It is well figured by Reeve in the Conch. Icon. Monograph of 

 Chitons, pi. XV. fig. 84, and in Tryon and Pilsbry's Manual of 

 Conchology, Vol. xiv. p. 173, pi. xxxvii. figs. 14-18. It is closely 

 allied to G. Sinclairi, Gray, another New Zealand species. 



Chiton Incei, Reeve. 



Described in Conch. Icon. Monograph Chitons, Sp. 94, pi. xvi. 

 fig. 96, detail, fig. 94, 1847, and listed in Angas's IVIarine Moll. 



