142 



PEOCEEDnsrGS OF THE MALACOLOGICAL SOCIETT. 



3. IscHNOCHiTON (Stenochiton) juloides, Ad. & Ang. 

 PI. XII, Fig. 1. 



Stenochiton juloides, Adams & Angas : Proc. Zool. Soc. 1864, p. 193; 

 op. cit. 1865, pi. ii, fig. 15; Pilsbry, Man. Conch., ser. I, 

 vol. xiv, p. 55, pi. xvi, figs. 6-8. 



A very peculiar and easily recognized form of Chiton, hut one 

 that does not often fall into the hands of 

 the collector. In addition to the original 

 description by Adams and Angas, the amplified 

 one of the type-specimen by Dr. Carpenter 

 is given in the Manual of Conchology, so it 

 is nnnecessaiy to repeat them here. Four speci- 

 mens have come into my hands, all of which, 

 besides one or two others that I know of, were 

 found living on Pinna shells, below low-water 

 mark. The very young ones 5-7 mm. in length 

 are not uncommon in shell sand, but the full- 

 grown shell is by no means easily obtained. 

 Length of largest specimen 46 mm., breadth 

 8 mm. 



^«J.— (Type) Holdfast Bay (Angas); Largs 

 Bay (Adcock) ; Yorke Peninsula (Matthews). 



t , 1 



\ 3 



Ischnochiton juloides, 

 Ad. & Aug. 



4. IscHNOCHiTON (Stenochiton) Pilsbrtanus, n.sp. 



Shell small, thin and delicate, narrow and elongated, evenly high- 

 arched, and ronnded dorsally. Surface glossy and smooth ; under the 

 lens seen to be closely dotted with white on the lateral areas and end 



valves, and with short longi- 

 tudinal strokes on the central 

 areas. Colour various : pale 

 green, closely and indistinctly 

 mottled with white, and with 

 several brown dots along the 

 posterior sutural margin of 

 each valve, and marked with 

 white, or sometimes pink, at 

 each umbo, or of a dark chest- 

 nut shade blotched at each 

 umbo with white. The girdle 

 light, with dark bars. An- 

 terior valve somewhat wider 

 than long, the anterior slope 

 straight or slightly convex. 

 Intermediate valves over twice as wide as long; lateral areas well 

 raised, but not with sharply defined anterior borders, and narrowly 

 wedge-shaped, not extending'to the outer-anterior angle of tegmentum. 



Ischnochiton Pihhryanus, n sp. 



1, dorsal view ; 2, veutral view of median 

 valve ; 3, anterior view of same ; 4, dorsal 

 view of posterior valve ; 5, lateral view of 

 same. 



