184 GASTROPODA. {Pectinibranchiu. 



10. Lagochilus Studeri, Suter, 1896. Plate 10, fig. 2. 

 Lagochilus Studeri, Suter, P. Mai. S., ii, 34, pi. 4, f. 2. 



Shell very small, globosely conoidal, perforate, whitish-horny, 

 faintly glossy, fragile, translucent. Sculpture consisting simply of 

 regular and close growth-lines. Colour uniformly whitish-horny. 

 Epidermis very thin, glossy. Spire conoidal, rather short, h sight the 

 same as that of the aperture. Protoconch globose, smooth. Whorls 

 3|, rather rapidly increasing, convex, slightly flattened below the 

 suture, the last with a rounded periphery ; base convex. Suture deep. 

 Aperture ovate, higher than broad. Peristome simple, acute. Outer 

 lip regularly arched ; basal lip acutely convex. Columella almost 

 straight, vertical ; no callosity uniting the converging margins. There 

 is no indication of a notch at the suture. Umbilicus pervious, very 

 narrow. Operculum thin, horny, with a few whorls round a subcentral 

 nucleus. 



Diameter, 2-25 mm. ; height, 3 mm. ; height of aperture, 1-5 mm. 



Dentition unknown. 



Type in my collection. 



Hob. Whangarei, type (Mr. Grosch). 



Remark. The only specimen I have is immature, and the generic 

 position is somewhat doubtful. 



11. Lagochilus torquillum, Suter, 1894. Plate 35, fig. 8. 



Lagochilus torquillum, Suter, P.L.S. N.S.W. (2), viii, 485, pi. 22, f. 2-26. 



Shell minute, conical, subperforated, rufous, thin and fragile, semi- 

 transparent. Sculpture consisting of close white membranaceous and 

 oblique radiate plaits, directed slightly backward ; there are about 

 15 per millimetre on the last whorl ; interstices microscopically spirally 

 striate, more distinct on the base. Colour uniformly rufous. Epi- 

 dermis thin, horny, not shining. Spire acutely conical, with a rather 

 sharp apex, higher than the aperture. Protoconch papillate, of 2 whorls, 

 which are finely spirally striate and strongly convex. Whorls 5, 

 the last occupying nearly half of the total height, strongly convex, 

 rounded at the periphery ; base convex. Suture deep. Aperture 

 oblique, circular. Peristome simple, straight, the margins not meet- 

 ing, but united by a thin parietal callosity, no notch at the suture. 

 Columella arcuate, thin, a little reflected over the narrow perforation, 

 which in adult specimens is entirely covered. Operculum unknown. 



Diameter, 1-25 mm. ; height, 1-75 mm. 



Dentition unknown. 



Type in my collection. 



Hab. Howick, type (Major Broun); Hunna Range; bush near 

 Napier (A. G. Clark). 



