STROMBID^, 1 95 



Elongate, fusiform, anterior canal long and straight, or curved ; 

 no posterior canal ; outer lip with two long, slender, digitate 

 processes, 



Tessarolax, Gabb. 



Bistr. — Oret. ; Am., Eur. T. bicarinata, d'Orb. (Ix, 89). 



Shell subfusiform, spire elevated ; the greater part or whole of 

 spire and bodj^-whorl covered b}^ an extension of the inner lip in 

 the adult ; anterior canal long, curved or straight ; j^osterior 

 canal long, running up the spire and extending bej^ond 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 bodj^-whorl. 



PTEROCERELLA, Mcck. 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. T. Tippana, Conrad (Ix, 90). Cretaceous. 



Alaria, Morris and Lycett, 1850. 



Syn. — Alaria, sections Yaricifer and Longicaudes, Piette. 



Bistr. — Jurassic ; Eur., India. A. armata, Morris and Lycett 

 (Ix, 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 bj^ 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. B. ranelloides, Piette. Jura. 



DiEMPTERUS, Piette, 1816. 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. B. goniata, Heb. Callovien. 



Harpagodes, Gill, 1869. 



Bistr. — Cret. and Jur. ; Europe. H.pelagi, d'Orb. (Ix, 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 ; 



