148 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Hal. — Dredged only in Sultana Bay (E. H. Matthews). 



The chief characteristic of this species is the serrated posterior 

 edges of the valves, and it answers very closely in several particulars to 

 Carpenter's Isclmochiton serrafus (Pilsbry, Man. Conch., ser. I, vol. xiv, 

 p. 122, and xv, p. 78). Mr. Matthews tells me that the coloration of 

 this species when living affects that of the object to which it may 

 be attached. It is a beautifully scidptured species, but inconspicuous 

 as regards colour. I have named it after Professor Ralph Tate in 

 acknowledgment of my indebtedness to him for the loan of literature 

 which was indispensable to me for the identification of the Chitons 

 of this province. 



15. IsCHNOCHITOX SlIAEAGDINDS (Angas). 



Lophyriis smaragdinus, Angas: Proc. Zool. Soc. 1867, p. 115, pi. xiii, 

 fig. 28; Pilsbry, Man. Conch., ser. 1, vol. xiv, p. 137, 

 vol. XV, pi. XV, fig. 27. 



Hob. — Yankalilla, Port Willunga, Noarlunga, Marino, and Largs 

 Bay, the last being near the entrance to the Port Adelaide Kiver. 

 It has been obtained recently by Air. Matthews near Cape Spencer, 

 Investigator Strait. Its type locality is Port Jackson, New South 

 Wales, and it also occurs in North-West Tasmania. 



This beautiful little Chiton was unknown as a South Australian 

 species until the commencement of 1895, when, within the space of 

 three months, it was discovered in several localities comprised in 

 a distance of about thirty miles on the eastern shores of St. Vincent's 

 Giilf. Specimens occur having the pattern of the variety picturatuSy 

 but more sombre in coloiir than the Port Jackson examples, with 

 scattered blue spots somewhat as in /. lentiginosus. In several Port 

 Jackson specimens examined the slits vary from 10-11 in the anterior, 

 and from 9-12 in the posterior valve. 



16. IsCHNOCHiTON vniGATUs (Recve). 



Chiton virgatics, Reeve: Conch. Icon., sp. 192 ; Pilsbry, Man. Conch., 

 ser. I, vol. xiv, p. 78, pi. viii, figs. 72, 73. 



In form this species is rather long and narrow, and the girdle- 

 scales are very small, much finer than in /. smaragclinus. The last 

 character at once separates /. virgatus from the young /. lentiginosus or 

 /. smaragdinus, which have relatively large girdle-scales. The tyi^e- 

 specimens are recorded to be 5 mm. in length, and 2 in breadth. The 

 average length of those in my collection is 8 to 9 mm., and breadth 4, 

 but I have one example ITS mm. long and 4-5 wide. 



Mah. — Original locality "Port Lincoln," in all probability collected 

 by Harvey. It is plentiful on both sides of Southern Yorke Peninsida ; 

 and I have it from Encounter Bay, Port Willunga, and Marino. 



A very diminutive but most daintily painted shell, quite distinct 

 from its allies — /. lentiginosus, Sby., and /. smaragdinus, Angas. Its 

 essential distinguishing characters have been drawn by Dr. Cai-penter 

 from the type- specimens in the Cumingian Collection, and these are 

 published in the Manual of Conchology ; since as only two specimens 



