222 RET. R. BOOG WATSON ON THE 



number of whorls, 11 millims. to 13 whorls being his measure- 

 ment. Turritella accisa differs from T. runcinata, W., in being 

 smaller, narrower, suture much deeper, upper whorls angulated 

 and sculptured, not rounded, and smooth ; and the apex is much 

 finer and sharper, and is hyaline white, while in that species it is 

 brownish yellow and hardly translucent. 



3. Tttrritella carlott.e, n. sp. 



St. 162. April 2, 1874. Lat. 39° 10' 30" S., long. 146° 37' E. 

 Moncoeur Island, Bass Strait. 38-40 fms. Sand. 



St. 167 a. June 27, 1874. Lat. 41° 4' S., long. 174° 19' E. 

 Queen Charlotte Sound, New Zealand. 10 fms. Mud. 



Shell. — High, narrow, conical, with slightly impressed suture 

 and an angular flattened base, thin, translucent, with fine ruddy 

 spiral threads. Sculpture. Longitudinals — there are fine, thread- 

 like, close-set curved lines of growth. Spirals — there are two prin- 

 cipal, two secondary, and very many minor spirals ; but the rela- 

 tive value of these varies a good deal; they are little raised, but 

 distinct. The base is covered with fine crowded spirals, of which 

 those near the edge are stronger than the rest. The microscopic 

 system of spirals is fine, sharp, and distinct. Colour yellowish 

 ashy white, with a suffused ruddy brown on the upper part of the 

 whorls, and a stronger shade of the same colour defining the more 

 important spirals. The colour becomes altogether paler up the 

 spire, and the apex is white. Spire very perfectly conical ; but 

 the profile lines are interrupted by the impressed sutures. Apex 

 small, rounded, smooth and glossy, consisting of 1^ embryonic 

 whorl ; the next whorl is slightly angulated, after which the 

 regular sculpture begins. Whorls 15, very slightly convex on 

 the sides, contracting gradually upwards into the suture ; towards 

 the bottom of the whorl the contraction into the suture is 

 shorter, straighter (*. e. less convex), and more rapid ; they are 

 of very gradual and regular increase. Towards the upper part of 

 the spire the curve of the profile line of each whorl becomes in- 

 creasingly stronger. The base is flat, very slightly conical, sharply 

 angulated, and not contracted at the edge. Suture very slight, 

 but well defined. Mouth small, angularly rounded, a little higher 

 than broad. Outer lip a little drawn in and advancing on the 

 edge of the base, descends straight to the lower outer angle, is 

 flat across the base, and a little patulous in front of the pillar-point. 

 The generic sinus in the outer lip is parabolic in form. Inner 

 Up. There is not (though the specimens are full-grown) even a 



