56 ACM.KA. 



A. SCABRILIRATA Angas. Unfigured. 



Shell small, thin, subovate, a little planate ; outside of a whitish or 

 gray color, variously maculated and penciled, sometimes streaked ; 

 very elegantly ornamented with more or less distant, most minutely 

 granulose, very acute radiating riblets, the interstices wide, flat. 

 Apex curving forward, at the third or fourth of the length. Inside 

 very shining bluish-green, varied with reddish-brown ; margin wide? 

 tesselated or penciled ; central area rarely conspicuous. (Angas.) 



Length 12 mill. 



Port Jackson ; Port Phillip ; Port Lincoln ; Hobson's Bay, Viet. ; 

 Holdfast Bay, St. Vincents Gulf. 



A. scabrilirata ANG., P. Z. S. 1865, p. 154 ; I. c., p. 186 ; /. c. 1867, 

 p. 220. 



This small and tender, but exceedingly beautiful species is gener- 

 ally more or less abraded ; but when perfect is easily recognized by 

 the sculpture, which consists of distant, extremely slender riblets, 

 each of which consists of, or is surmounted by, a series of minute 

 granules. A rare variety is striped like the young of A. pelta (A. 

 strigillata Nutt) ; but in general it is more or less, mottled, some- 

 times delicately penciled, like A.fascicularis Mke., from the Gulf of 

 California. 



May be a form of A. septiformis. 



A. CHATHAMENSIS Pilsbry. PI. 35, figs. 43, 44, 45, 46. 



Shell oval, depressed, apex within the middle third of the length ; 

 radiately striated; interruptedly banded and spotted with umber on 

 a white ground. Spatula chestnut, well-defined ; border wide, light 

 with brown dots and lines. 



The surface has even rather fine, close and obsolete radiating 

 riblets. The coloration is peculiar, consisting of dots, spots and stripes 

 formed of interrupted brown lines. The stripes when present are 8 

 or 10 in number. 



The inside is white or suffused with yellow, with a brown central 

 area and a wide border variously marked. 



Length 30, breadth 24, alt. 6 mill. 



Length 24, breadth 20 J, alt. 8i mill. 



Chatham Is. 



This very pretty white species is quite different from any known 

 to me from any part of the world. 



