862 MR. G. F. ANGAS ON NEW MARINE SHELLS. [Nov. 5, 



Hab. Living, in two fathoms water, Surveyor's Point ; among 

 shell-sand, Holdfast and Aldinga Bays and Salt Creek. 



Parthenia gracilis, n. sp. (Plate LIV. fig. 9.) 



Shell elongately turreted, moderately thin, white, regularly longi- 

 tudinally ribbed, the interstices crossed with very fine hair-like striae ; 

 whorls 7i, slightly convex, contracted above and below the sutures ; 

 sutures strongly impressed ; aperture quadrately ovate ; outer lip 

 subarcuate, slightly angled above ; inner lip with a single sharp tooth 

 about the middle of the columella. 



Alt. 2\, diam. | line. 



Hab. Shell-sand, Glenelg, St. Vincent's Gulf. 



Cyclostrema tatei, n. sp. (Plate LIV. fig. 10.) 



Shell widely and deeply umbilicated, orbicular, depressedly turbinate, 

 moderately thin, under the lens very finely transversely striated, 

 shining pearly white ; whorls 4, rounded, flattened and slightly 

 excavated next below the suture, with one, or sometimes two, narrow 

 thread-like keels at the upper part, and strongly keeled round the 

 umbilical region ; sutures distinct ; apex rounded, obtuse ; aperture 

 subcircular ; lip simple. 



Diam. maj. 1|, min. 1, alt. | line. 



Hab. Shell-sand, Holdfast Bay ; found alive in the estuary of 

 the Sturt. 



The above is the normal condition of the species ; but examples 

 occur which are thinner and have a greater number of keels, some- 

 times as many as seven or eight. At first I was inclined to regard 

 the many-keeled variety as specifically distinct ; but on the exami- 

 nation of a large series by Professor Tate, he assures me that the 

 number of keels varies so greatly that it would be impossible to 

 separate them. The thin hyaline examples with many keels are 

 probably younger shells. 



Buccinulus intgrmedius, n. sp. (Plate LIV. fig. 11.) 



Shell elongately ovate, solid, shining, white, painted with two bands 

 of irregular descending brown flames and spots ; spire acuminate, 

 pointed at the apex, the same length as the aperture ; whorls 6g, 

 encircled by numerous grooved and finely punctured striae, that 

 become obsolete on the centre of the last whorl ; sutures strongly 

 impressed ; outer lip simple, thin, non-arcuate ; columella with a 

 strong bilobed fold near the base, and a smaller projecting plate 

 above it ; inner lip with a broad spreading callus. 



Long. 4g, lat. 1| line. 



Hab. Aldinga Bay. 



This, the only species of Buccinulus as yet discovered in South 

 Australia, is allied to B. affinis, A. Ad., from New South Wales, 

 from which it differs somewhat in form, and also in the style of 

 coloration. 



Nacella parva, n. sp. (Plate LIV. fig. 12.) 



Shell depressedly conical, cap-shaped, semipellucid, nearly smooth, 



