153 



Posterior slope without lircT ; apex twice tlie 

 size. 4. P. Murrayana. 



Wliorls convex, co stated. 



Costae broad ; canal longer tlian aperture. 

 "Whorls a little flatted behind. 



5. P. altifrons. 



"Whorls equally contracted. 6. P. Aldingensis. 

 Costae slender ; canal short. 7. P. affinis. 



Whorls convex, not costated. 



Cancellated ; canal short, 8. P. transenna. 



Lirse slender ; canal very long, attenuated. 



9. P. lintea. 



Stoutly lirate, posterior whorls subangulated and 



and costated. 2. P. purpuroides. 



Peristome not continuous. Apex hemisphaeric, radially 



ridged. 



Whorls bicarinated. 10. P. apicilirata. 



"Whorls regularly convex. 11. P. actinosteplies. 



Peristome continuous ; inner lip erect. 



Whorls subpyriform ; last whorl ventricose. 



12. P. succincta. 

 Whorls fusiform ; beak long and slender. 



LiraB angular, alternately large and small ; 

 whorls flattened at shoulder. 



13. P. interlineata. 

 Lirffi flat ; tranversely wrinkled. 14. P. suhundidosa. 



1. Peristernia approximans, spec. nov. Plate ix., fig. 2. 



Shell fusiform, solid, of ten angular- convex whorls, ending 

 in a small, subacute apex, provided with eight narrow trans- 

 Terse plications, bent forward on the posterior slope and be- 

 coming obsolete on the base of the body w^horl. Ornamented 

 with depressed rounded spiral lirae, which are somewhat irregu- 

 lar and unequal, about nine on the posterior slope, decreasing in 

 strength as the suture is approached, about 20 on the medial 

 and front parts of the body whorl ; the interstitial spaces 

 are narrower than the lirae, and are pitted by transverse threads, 

 which on the posterior slope appear as crowded imbricating 

 forward-curved lamellae. 



Aperture narrowly ovate ; outer lip stoutly lirate within? 

 attenuated and crenatulated at the margin, with an oblique 

 fold at the origin of the canal ; columella concave to the 

 slight oblique fold at its junction with the canal ; canal rather 

 long, slightly bent to the left, and a little upturned at the 

 ^extremity. 



Length, 27 ; breadth, 11 ; length of aperture, 8 ; of canal, 8. 



