192 STROMBID^. 



TSOPLEURA, Meek. Longitudinally ribbed, aperture narrow, 

 notched in front, outer lip simple, no posterior canal. Cretaceous. 

 JR. curvilirata.1 Conr. (Ix, 76). 



CYCLOMOLOPS, Gabb. Smooth, without anterior canal, posterior 

 canal long, running up the spire, columellar lip with a thick 

 callus which, continuing around the anterior end of the aperture, 

 forms a thickened margin to the outer lip. R. Icevigata, Mellv. 

 (Ix, 11). 



ORTHAULAX, Gabb. Shell rounded-fusiform, canal moderate, 

 straight and regularly tapering ; adult shell enveloped over the 

 whole spire bj^ an extension of the inner-lip callus ; posterior 

 canal fissure-like, formed by the continued edge of the outer lip 

 and running directly to the apex ; outer lip apparently sharp 

 and simple, anterior notch oblique and broad. P. inornata, 

 Gabb. Tertiary ; West Indies. 



CALYPTRAPHORUS, Cour. Anterior canal long and straight ; 

 posterior canal long, appressed to the spire and arching on the 

 back ; outer lip moderate, rounded and thickened on the margin 

 by a smooth border; young shell showing all the volutions, 

 which are hidden in the adult by a polished incrustation covering 

 the entire surface, and in some species bearing tubercles. 

 Eocene ; U. S. Cretaceous ; India. B. trinodiferns, Conr. 

 (Ix, IS). 



Spinigera, d'Orb. 



Distr. — 5 sp. Fossil, in the Oolite of Europe. S. longispina, 

 Desl. (Ix, 19). S. spinosa, Munst. (Ix, 80). 



Shell elongated, slender, fusiform, with a long, straight 

 anterior canal; each volution bearing one or two varices, those 

 of successive whorls being arranged continuously as in Ranella, 

 and bearing each a long, transverse spine. 



Terebellum, Lam. 



Etym. — Diminutive of terebra, an auger. 



Syn. — Seraphs, Montf. 



Distr. — T. subulatum, Lam. (lix, 66). China, Philippines, 

 Fossil, 8 sp. Eocene — ; London, Paris. 



Animal with eyes on the ends of peduncles, no tentacles, foot 

 anteriorly small and rudimentary. Operculum narrow, denticu- 

 late. Shell subulate, spire slightly produced or blunt ; aperture 

 narrow, notched in front; outer lip simple, sharp; inner lip 

 more or less incrusted, the columella straight and truncate. 



The Terebellum inhabits deep water. In progressing, it 

 rolls its shell over and over, performing a series of irregular 

 jumps ; when first taken from the water, it will even leap several 

 inches from the ground. It is extremely shy and sensitive in 

 its habits, poising the shell in a vertical position, and protruding 

 the longer telescope eye (for, singularly enough, one eye-pedicel 



