Victorian Chitons. 153 



ter's manuscript name of limans in place thereof, calling the 

 specimens in the Wilson collection Chiton limans, Sykes, and giv- 

 ing no fresh description. A careful examination reveals the fact 

 that the specimens to which Sykes attached the name of limans 

 are. really Pilsbry's shell, R. tricostalis, named two years earlier 

 than the issue of Sykes' paper, the pointed scales " sub erect 

 apices " of the shells from Port Jackson, to which Carpenter's 

 manuscript refers, are not present in the specimens in this col- 

 lection. 



Rhyssoplax jacksonensis, n.sp. 



Non Chiton muricatus, Tilesius (Mem. Ac. St. Petersb. (1st 

 ser.) ix., p. 483, t. 16, f. 3, 1824. See Middendorf, Mai. 

 Ross., p. 129). Chiton muricatus, A.Ad. (P.Z.S., 1852, p. 

 91, t. 16, f. 6), not of Tilesius. Lophyrus muricatus, An- 

 gas (P.Z.S., 1865, p. 186, 1867, p. 222), not of Tilesius. 

 Chiton limans, and Chiton camosus, Carpenter MSS., is a 

 nomen nudum. Chiton muricatus, A. Adams of Pilsbry 

 (Man. Con. xiv., p. 175, pi. 37 , fg. 12, 13, 1892), not of 

 Tilesius. Non Chitans limans, Sykes (Proc. Mai. Soc, vol. 

 ii., pt. 2, p. 93, July, 1896), which is not limans of Car- 

 penter, but = Chiton tricostalis, Pilsbry .(Naut., vol. viii., 

 p. 54, 1894). 

 Introduction. — The discovery that the shells in the Wilson 

 -collection which Sykes named in 1896 as Chiton limans, Sykes, 

 were really a shell described two years earlier by Dr. Pilsbry, 

 tinder the name of Chiton tricostalis, leaves the New South Wales 

 shell still without a name. 



The name muricatus, given to this shell, by Adams, and adopted 

 "by both Angas and Pilsbry, as shown above, was preoccupied. 

 Carpenter's MSS. name of limans cannot now be used. Chiton 

 limans of Sykes now becomes a synonym of Rhyssoplax tricos- 

 talis. I therefore propose to name this familiar New South 

 Wales shell Rhyssoplax jacksonensis, Ashby, after the famous 

 liarbour in which I collected the type. 



Description. — The following is Pilsbry's description, under 

 the name of Chiton muricatus, A.Ads., and it is, I believe, a 

 transcription from Carpenter's manuscript. It is such an excel- 

 lent description of the shell I have selected as type, that I copy 

 it in full, supplementing it with a few additional notes of my 

 own : — 



"Shell oval, elevated, the jugum acute; mucro median, sub- 

 prominent; olivaceous, maculated with paler; entire surface 



