132 GASTROPODA. [Aspiddbranckia. 



rhomboidal, reddish iridescent and lirate within. Outer lip thick, 

 plicate within. Columclla straight, denticulate, with a strong basal 

 truncation. 



Diameter, 13 mm. ; height, 20 mm. 



Type in the British Museum. 



Hob. Rangitoto Channel, near Auckland ( T. F. Cheeseman) ; 

 Chatham Islands : scarce. Tasmania and Australia. 



Remarks. Rather variable in sculpture ; the spaces between the 

 spiral ribs often occupied by lirulae. 



Genus 4. PHOTINULA, H. and A. Adams, 1854. 



Photinula. H. & A. Ad. : Ad., G.R.M., i, 1854, 427. Type : P. ccerulescens, 

 King. Kingotrochus, von Ihering, 1902. 



Animal having an asymmetrical cephalic region, the left epipodial 

 lobe usually absent ; there are 4 epipodial tentacles on each side. 

 No jaws. Radula with the central tooth broadly oval and a small 

 reflection, narrow or broad, sometimes minutely denticulate ; the 5 

 lateral teeth increasing in size from the centre outwards ; they have 

 a broad reflection with an inner stout cutting-point and 2 to 3 fine 

 denticles on the outer side ; uncini with a strong pointed tooth. 



Shell imperforate or perforate, conoidal, subdepressed, whorls 

 smooth, generally polished and with fine spiral lines. Aperture large ; 

 outer lip sharp ; inner lip strongly callous and usually spreading 

 outward and more or less covering the narrow umbilicus. Operculum 

 multispiral. 



Distribution. Austral seas. 



Remarks. Thiele included in his genus Margarella our species 

 P. nitida and P. antipoda because the dentition shows a close re- 

 semblance. Margarella stands, no doubt, neaxer to Valvatella, the 

 animal having jaws. 



KEY TO SPECIES. 



A. Shell narrowly umbilicated, with distinct spiral lira 1 , about 10 on 



the penultimate whorl . . . . . . . . . . nitida. 



B. Shell subperf orate or imperforate, a few distant tine spiral lirw . . antipoda. 



C. Shell imperforate. very finely and densely spirally striate, about 



30 striations on the penultimate whorl . . . . . . decepta. 



1. Photinula antipoda, Hombron and Jacquinot, 1854. Plate 38, 

 fig. 19. 



Margarita antipoda, H. & J.. Voy. P.S., v, 58, pi. 14, f. 26-28. Photinula 

 antipoda, H. & J., Man. Conch. (1), xi, 217, pi. 33, f. 102-104 ; Suter, P. 

 Mai. S., ii, 277. 



Shell small, globosely conic, subperforate or imperforate, smooth, 

 shining. Sculpture consists of a few distant fine spiral striae, visible 

 only under a good lens, more distinct on the base, and very fine close 

 growth-lines. Colour purplish-black, the upper whorls iridescent, 

 mostly with dark-red spiral bands, 1 or 2 on the spire-whorls, 4 to 5 

 on the body-whorl, sometimes a number of whitish zigzag bands near 



