HV C. HEDLEY. 9 



the other, from the lower and larger of which there protrudes a 

 slender tongue attached dorsally, but free ventrally. In the 

 corresponding position of the left valve are two pockets divided 

 by a septum which is continued into the anterior arm of the 

 cardinal. Length 20, height 16, breadth of conjoined valves 

 9 mm. 



Hab. — Port Jackson: one specimen, containing the animal, was 

 found on Balmoral Beach by Miss L. Parkes, a daughter of the 

 veteran Australian statesman, in whose honour it is named. 



Type. — Miss Parkes has generousl}'- presented her specimen 

 to the Australian Museum. 



This species belongs to the Section Jlaclririida; the absence of 

 plicate sculpture distinguishes it from other members of the 

 group. 



Retusa nitida, a. Adams. 



(Plate ii., fig. 27.) 



Bulla nitida, Ad., Thes. Conch, ii., 1850, p. 589, pi. 125, f. 127. 



Numerous specimens of a shell taken by Mr. J. Brazier in 

 Torres Straits appear to be this species. It is an addition to the 

 Australian fauna; indeed, except for a record from the Persian 

 Gulf,"^ it seems only known from the original locality, Borneo. 

 As the original account is rather unsatisfactory, I add a figure 

 and description of a Torres Straits example. 



Shell small, ovate, rather thin, narrowly umbilicate above, 

 subperforate below. Colour white. Sculpture: faint longitudinal 

 oblique growth-lines are crossed for the anterior and posterior 

 quarters by half a dozen lightly incised grooves; the vertex also 

 radiately traversed by a few delicate raised threads, leaving the 

 median half of the shell bare of ornament. Aperture amjDle 

 below, constricted at the waist, narrow above and rising in an 

 arch above the vertex. Columella broad and twisted. Height 

 3*5, breadth 2-7 mm. 



* Melvill & Standen, Proc. Zool. Soc, 1901, p. 454. 



