538 Hon. N. C. Rothschild on new 



tinuous, vitreous, showing under the microscope the con- 

 centric growth-markings, broadly expanded except in the 

 parietal region, where it is considerably contracted, not 

 reflexed, circumference ovate; aperture circular, set well to 

 the 'left of the axis of the shell ; operculum thin, corneous, 

 yellowish white, paucispiral, with central raised nucleus, 



Alt. 2 - 5, diam. maj. 1*25 mm. 



Hob. Stockyard Creek, Norfolk Island (R. Bell). 



Palaina belli, sp. n. 



Shell small, sinistral, roughly ovate, dull white shading to 

 pale flesh-colour, with reddish-brown apex ; whorls 5, con- 

 vex, the first two small, the third proportionately large, the 

 remainder regularly increasing, the two apical whorls quite 

 smooth, the remainder sculptured with closely set, wavy, 

 spiral stride which become considerably coarser on the last 

 whorl, crossed by not very erect, rather oblique, transverse 

 costula? ; suture deeply impressed ; umbilicus narrow, deep ; 

 labium continuous, outwardly expanded, sublaminiferous, 

 circular; aperture large for the size of the shell, subcircular. 



Alt. 3"5, diam. maj. 1"75 (nearly) mm. 



Bab. Mount Pitt, Norfolk Island (R. Bell). 



Differing from the preceding chiefly in its smaller size, it 

 having one whorl less, in the more closely set and less erect 

 and blade-like costulse, coarser spiral striae, the circular 

 circumference of the labrum, and in the comparatively large 

 size and more central position of the aperture with regard to 

 the axis of the shell. 



LXVI. — Five new Siphonaptera from Asiatic Russia, collected 

 by W. Riickbeil. By the Hon. N. Charles Rothschild, 

 M.A. 



[Plates XIV. & XV.] 



One of the two species described below belongs to the genus 

 Avhich we call Ctenophthalmus, Kolen. We dealt with this 

 generic name at some length in Nov. Zool. 1911, p. 80, and 

 came to the conclusion that its type is a species with three 

 genal spines. A. C. Oudemans, in a recent note on Siphon- 

 aptera (Entom. Berichten, 1913, p. 341), maintains, on the 

 contrary, that musculi is the type. He says : — " The genus 

 Ctenophthalmus is well defined by Kolenati by the words 



