STROMBID. 195 
Elongate, fusiform, anterior canal long and straight, or curved ; 
no posterior canal; outer lip with two long, slender, digitate 
processes. 
TESSAROLAX, Gabb. 
Distr.—Cret.; Am., Eur. IT. bicarinata, d’Orb. (Ix, 89). 
Shell subfusiform, spire elevated ; the greater part or whole of 
spire and body-whorl covered by an extension of the inner lip in 
the adult; anterior canal long, curved or straight; posterior 
eanal long, running up the spire and extending beyond it; outer 
lip carrying two long, slender digitate processes; the incrusta- 
tion of the adult shells carries one or two prominent bosses or 
tubercles on the body-whorl. 
PTEROCERELLA, Meek. Shell small, thin; whorls few, rounded, 
smooth or subangulated; last one not much enlarged. Lip 
greatly extended, and ascending the spire, trilobate—the middle 
lobe much larger and more produced than the others, carinated 
on the outer side. 7. Tippana, Conrad (1x, 90). Cretaceous. 
AuariA, Morris and Lycett, 1850. 
Syn.—Alaria, sections Varicifer and Longicaudes, Piette. 
Distr.—Jurassic ; Eur., India. A. armata, Morris and Lycett 
(le 91): 
Shell fusiform, spire elevated; anterior canal more or less 
produced, straight or curved; no posterior canal; outer lip 
digitate, formed at one or more stages previous to the adult age, 
and left behind by the growth of the shell, producing varices or 
tubular spines ; inner lip thin. 
The above description defines the genus as restricted by Gabb. 
DIARTHEMA, Piette. Shell with continuous varices; a wing- 
like varix opposite the mouth. Lower Oolite; France. A. 
paradoxa, Desh. 
CUPHOTIPHER, Piette. The wing-like varix with a strong, 
laterally compressed tubercle, sometimes developing a posterior 
finger. D. ranelloides, Piette. Jura. 
DIEMPTERUS, Piette, 1876. Shell fusiform, winged, with straight 
anterior canal; whorls with spines or varices; wing entire or 
digitate ; last whorl with a strong varix opposite the wing, indi- 
cating the position of a former mouth. D.goniata, Heb. Callovien. 
Harpacopes, Gill, 1869. 
Distr.—Cret. and Jur.; Europe. H. pelagi, d’Orb. (1x, 93). 
Shell obconic or ovate-conoid, spire moderate, canal produced 
into a long digitation boldly recurved towards the left, labrum 
much alated and produced into spiniform digitations. Whorls 
convex or flat between the angle and suture, spirally ribbed, with 
larger rib-like, angular, median, and anterior fascioles (and some- 
times post-angular), each emitting long spiniform digitations ; 
