Coininella.] GASTROPODA. 391 



Diameter, 20 mm. ; height, 32 mm. (from Reeve's figure). Dia- 

 meter, 14 mm. ; height, 27 mm. (New Zealand, in my collection). 

 Diameter, 13 mm. ; height, 23 mm. (East Cape). 



Animal unknown. 



Type in the British Museum. 



Hob. East Cape. 



Remark. This is a rare species, and appears to be also variable in 

 form. It seems to live in the laminarian zone. 



Fossil in the Pliocene of Waikopiro. 



Subfam. 2. PHOTIN.E. 



Siphonal fasciole with an outer groove ; aperture without a posterior 

 channel ; canal short and wide ; columella with an anterior slight 

 fold. 



Genus 2. PHOS, Montfort, 1810. 



Phos, Montfort, Conch. Syst., ii, 1810, 494. Type : Murex senticosus, L. 

 Rhinodomus, Swainson, 1840. 



Animal with a small head, with the tentacles approximating or 

 connate at their base, and eyes near their tips ; foot broad, with 2 

 lateral projections anteriorly, and a slender posterior filament ; male 

 organ long, thin, and flat. Radula with the central tooth tricuspidate, 

 the laterals with 2 cusps, the outer cusps a little longer. 



Shell elongated oval, acuminated, turriculate, generally with axial 

 ribs and spiral lirse ; spire long ; apex acute ; aperture elongated 

 oval ; outer lip generally lirate within, slightly sinuate below ; columella 

 arcuate, plicated at the base ; canal very short, slightly curved outward. 

 Operculum unguiform, triangular, lightly curved, nucleus apical. 



Distribution. -- Japan, China, Philippines, Indian Ocean, Aus- 

 tralasia. 



Fossil in the Tertiary. 



1. Phos tenuicostatus, T.-Woods, 1877. Plate 41, fig. 5. 



Cominella tenuicostata, T.-Woods, P.R.S. Tas., 1876 (1877), 135. Phos 

 tenuicostatus, T.-Woods : Tate and May, P.L.S. N.S.W., xxvi, 358, 

 tig. in text. 



Shell small, turriculate, axially costate and spirally striate, light 

 brown. Sculpture of the post-nuclear whorls consisting of prominent, 

 somewhat distant, broadly rounded axial ribs, about 18 on the body- 

 whorl ; they are thin and sharp on the shoulder of the whorls, some- 

 what flexuous on the base ; crossed by numerous unequal spiral 

 threads. Colour light brown. Spire acuminate, turriculate, a little 

 higher than the aperture with canal. Protoconch stout, subcylindrical, 

 smooth, of 2 whorls. Whorls 6 to 6J, regularly increasing, the last 

 rather large and somewhat ventricose, narrowly shouldered ; base 

 contracted. Suture, linear, not deep. Aperture slightly oblique, ovate, 

 angled above, with a short broad canal below, which is turned to the 



