BY C. HEDLEY. 449 



TURBONILLA GABRIELI, n.sp. 



(Plate xlii., fig 74 ) 



Shell small, slender, acicular. Colour dull white. Whorls ten, 

 and an obliquely projecting heterostrophe apex of about four 

 whorls. Sculpture : about eleven strong straight perpendicular 

 radial ribs, discontinuous from whorl to whorl, separated by deep 

 smooth interstices of equal breadth. These ribs cease abruptly 

 at the base, and are bounded by a slight spiral thread, which 

 reappears on the spire-whorls. Base smooth. Length 3-75; 

 breadth 07 ram. 



A few specimens of this remarkably slender species, from 5-10 

 fathoms. It is named in honour of a member of our party, Mr. 

 J. Gabriel. The subgenus Nisiturris^ which is largely developed 

 in these seas, includes this and T. taylori* 



TURBONILLA PERSCALATA, n.Sp. 



(Plate xlii., fig.75.) 



Shell small, solid, gradate, subcylindrical, imperforate. Colour 

 dull white, Whorls four, plus a half-immersed heterostrophe 

 protoconch. Sculpture : about eighteen prominent radial ribs, 

 which cross each whorl obliquely, and project on the summit. 

 The broad interstices are traversed by fine spiral threads, varying 

 in number and development. Aperture subquadrate, coluaiellar 

 fold distinct. Length 2*2; breadth 0'9 mm. 



This species varies considerably, both in form and sculpture. 

 Numerous specimens occurred, in 5-10 fathoms, Hope Islands. 



TURBONILLA TAYLORI, n.sp. 



(Plate xlii., figs.76-77.) 



Shell small, acicular. Colour : ribs opaque white on a semi- 

 translucent ground. Whorls seven, and a produced prostrate 

 heterostrophe apex of about three whorls. Sculpture : about 



*DalI & Baitsch, Pioc. U. S. Nat. Museum, xxx. 1906, p.341. 

 47 



