[Pboc. Rot. Soc. Victoria, 25 (N.S.). Pi- I-> 1912. 



Ar'I'. IX. — Description of Two New f,schnoch(toiis froiii Western 



Fort, Victoria. 



By A. R BASSET HULL 



(Sydney). 



Commi;nicated \)y C. J. Gahriel. 



(With Plate VIII. ). 



[Eead 11th July, litl2]. 



The two shells here described were dredged in from 6 to S fathoms, 

 between Phillip and French Islands, Western Port, Victoria, by Mr. 

 C. J. Gabriel, of Abbotsford. They were submitted to Professor Joh. 

 Thiele, of the Imperial Zoological Museum, Berlin, who expressed the 

 opini(jn that they were both new species, and after careful examina- 

 tion I concur, although one of the shells has already been taken by 

 dredging at Frederick Henry Bay, Tasmania, and identified by Tate 

 and May as Ischnochiton tateanus. It is, howeiver, undoubtedly 

 quite distinct from that species. 



The small shell, which I propose to associate with the finder, is 

 considered by I'rot'. Thiele to be certainly an Isrhnochituii, although I am 

 inclined to think that it possesses more of the characteristics of the 

 LepidopJeuriduc, inasmuch as valves ii. to viii. are unslit, and even 

 the anterior valve has very rudimentary slits. 



The types of both species are in the collcitiun of Mr. C. J. Gabriel. 



1. Ischnochiton gabpieli, n. .sp. (PI. VIIL, Figs. 1, a, b, c, d, e, f). 



Shell small, elevated, carinated. Colour yellow, irregularly macu- 

 lated with brown. Anterior valve fineh' granulose, the granules tend- 

 ing to a radial arrangement, the rays slightly curved. Median valves, 

 lateral areas slightly raised, covered with irregularly disposed granules ; 

 central areas with granules arranged in radiating rows, curving out- 

 wardly and diverging upwards oa-er the juguui. Posterior valve irre- 

 gularly granulose ; mucro obtuse, behind the middle. Girdle covered 

 with small, smooth densely imbricating irregular scales. Interior 

 white ; sinus broa<l and shallow ; anterior valve interiorly grooved and 

 with 9 slits ; median and posterior valves unslit. 



