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PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



smaller, but specimens labeled cwput-anguis, and sent to the Philada. 

 Acad. Nat. Sciences by Mr. Brazier, who collected them at Ballenger 

 Eiver, N.S.W., are fully as large as the typical form." 



Kecently, I have come into possession of two adult specimens, which 

 appear to me to belong to the true C. caput-anguis, and to prove its 

 specific distinction. My specimens are slightly smaller than the type- 

 specimen described by Philippi, but appear otherwise to exactly agree 

 with the description : they are much more convex, oblong, and piriform 

 in shape than C. caput-serpentis ; the dorsal surface is not so depressed, 

 nor the sides angulated. The smaller specimen has not quite com- 

 pleted the brownish tinting of the base, though otherwise adult, and 

 the dorsal surface is very similar to that of C. ca2)ut-serpentis ; it 

 measures 16 by 9'5 mm. In the larger specimen the brownish tinting 

 between the teeth and on the base is perfect. A young specimen 

 measures 15 by 9 mm. 



The specimens said to be wrongly referred to C. caput-anguis appear 

 to belong to another form, quite separable from the typical form either 



Fig. I. Cyprcea caput-anguis, Phil. 

 ,, II. C. caput-serpentis, Linn., variety usually mistaken for the preceding. 

 ,, III. C. caput-serpentis, var. caput-colubri, n. 



of this species or C. caput-serpentis. They are more oblong in form 

 than the latter, sides not thickened or angulated, nor is the dorsal 

 surface flattened or depressed, and the base is invariably white or 

 cream-coloured, being very noticeable both in young and adult 

 specimens. I have specimens from Western Australia and New South 

 Wales. 



