[Proc. Rot. Soc. Victoria, 22 (N.S.), Pt. I., 1909/ 



Ah'I'. IV. — Description of a New Marine Shell of the 

 Genus Larina. (() 



Bv J. H. (lATLIFF anj) C. J. GABRIEL. 



(With Plate Xiri.) 



;Pvead ]<)th June, 1909.] 



Larina (?) turbinata, sp. nov. 



Shell fragile, turbinate, umbilicate, white, semi-traiibparent, 

 vitreous interiorly, whorls six, including the minute embryonic 

 apex of two whorls, which are of a brown colour and appear to be 

 smooth, but under the microscope they are densely spirally 

 pitted. Whorls very rapidly increasing, the last and penulti- 

 mate comprising nearly the whole of the shell, the whorls are 

 ventricose, suture deeply impressed. Sculi^ture, faint ; under 

 the lens it is densely, irregularly, spirally striate, the striae 

 being somewhat undulating, and crossed by growth lines of 

 about similar strength. 



Tlie mouth is circular, peristome continuous, slightly re- 

 flexed : umbilicus small, deep, almost hidden by the reflexion of 

 the lip. 



The shell is partly covered with an olivaceous epidermis. 



The operculum of the type Avas lost. Ijut a microscopic ex- 

 amination of the embryonic form shows a lioniy operculum, 

 annular, and with the nucleus intramarginal. 



Dimensions of TS^pe. — Height, 15 mm. : width. IG mm. ; 

 width of radula, .54 mm. ; embryonic forms, height .625 mm., 

 width .597 mm. 



Hab. — Dredged in about five fathoms, between Phillip and 

 French Islands, Western Port. 



Obs. — The genus Larina was established by A. Adams for a 

 shell obtained at Moreton Bay, Queensland, and he included it 

 in the family Viviparidae. When obtained our type had the 

 animal in it, which, upon extraction, was found to contain about 



