BY E. M.. JOHNSTON, F.L.S. 



75- 



Genus Urosalpinx. Stimpson. (12.) 

 Syn Adamsia, Agnewia. 

 Shell fusiform; not variced ; longitudinally ribbed or un- 

 dulated and spirally striated ; aperture with, a short 

 canal ; outer lip dentate, Urate within. Operculum 

 semicordate, nucleus marginal. 



Genus Typhis. Montfort, (13.) 

 Shell ovate or oblong, with numerous projecting hollow tubular 

 spines between the three varices ; aperture nearly 

 round, produced in front into an enclosed siphonal 

 canal; operculum ovate with apical nucleus. 



Genus Tkophon. Montfort. (14-22.) 

 Shell large, broadly fusiform, usually shouldered and umbili- 

 cate ; with numerous lamelliform or laciniated varices, 

 spire prominent ; aperture ovate, lips thin ; canal open, 

 usually turning to the left ; shell white without, but 

 often dark within. 



Genus Purpura. Bruguiere. (23-28.) 

 Syn. — Microstoma. Thais. 

 Shell oblong-oval, last whorl large ; spire usually short ; 

 columella flattened ; aperture ovate, large, terminating 

 in a very short oblique channel, or notched ; outer lip 

 simple. Dist. — low water to 25 fathoms. 



(viii.) Family Tritonid^:. 



(Shell with varices which are either few and irregularly dis- 

 tributed, or form a continuous row crossing the whorls 

 on opposite sides.) 



Genus Triton. Montf. (29-33.) 

 Syn. — Tritonium, Charonia, Aquilus, Lampusia, Eanularia 

 Shell oblong with prominent spire ; whorls with a few 

 remote non-continuous varices ; columella rough or 

 smooth ; canal recurved ; outer lip crenate or denti- 

 culate ; operculum ovate with sub-marginal nucleus. 

 -Low water to 50 fathoms. 



Genus Banella. Lam. (34-36.) 

 Shell ovate or oblong, compressed ; varices two, continuous, 

 one on each side; columella arcuated, ridged or crenulate ; 

 aperture oval ; outer lip crenated ; canal short, 

 recurved ; operculum ovate, horny, with lateral nucleus, 

 Dist. — Eeef's and deep water. 



