BUCCINID^. 151 



Shell bucciniform, short, robust, thick ; spire low ; aperture 

 large, notched anteriorly ; outer lip simple ; inner lip incrusted 

 with a smooth callus ; surface longitudinally ribbed or striate. 

 Allied probably to Cominella or Volutharpa. 



Lacinia, Conrad. 



Distr. — L. alveata, Conr. = Pyrula Smithii, Lea (li, 11). 

 Eocene ; Ala. 



Globose ; pillar lip widely reflected, with a heavy posterior 

 callus ; basal emargination profound ; base dilated ; aperture with 

 a posterior channel ; outer lip simple. 



This does not difler very much from the recent Cominella 

 maculata, Martyn. 



Haydenia, Gabb. 



Dedicated to Dr. F. V. Hayden, U. S. Geologist. 



Distr. — H. impressa, Gabb (li, 72). Cretaceous ; California. 



Shell massive, allied, in general form, to Oliva, spire low. 

 Outer lip simple, not thickened nor crenulate ; inner lip incrusted, 

 callus marked posteriorly, without teeth or folds ; canal slightly 

 recurved ; anterior extremity of the -mouth notched, and a small 

 sinus at the posterior extremity of the aperture, where the outer 

 lip unites with the body-whorl. Surface ornamented as in some 

 of the Buccinidse. This curious form is probably a link between 

 Buccinum and Yolutharpa. 



Subfamily EB URNINM. 



Eburna, Lam. 



JEtyvi. — Ebur, ivory. 



Syn. — Latrunculus, Gray. Babylonia, Schliit. 



Distr. — 14 sp. Red Sea, India, Cape, Japan, China, Australia. 

 E. spirata, Lam. (1, 38, 39), 



Shell ovate-oblong, thick, porcellanous, under a thin epidermis; 

 deeply umbilicated ; spire acuminated, whorls more or less convex, 

 suture more or less channeled ; aperture oval ; columella arcuated, 

 posteriorly callous ; inner lip spreading, often covering the umbil- 

 icus in the adult; outer lip simple, acute. Operculum with apical 

 nucleus. 



The EburnaB comprise a small, very well defined group of about 

 a dozen species, the generic character being unmistakable in all 

 of them. The whorls have more or less shoulder ; those of E. 

 Zeylandica, showing the least, being a mere slight flattening of 

 the contour next below the sutures, whilst in E. spirata there is 

 a regular channel out of which arises the preceding whorl. The 

 species are all largely umbilicate, but in some of them the umbil- 

 icus is covered or filled, more or less completely, by the callous 

 inner lip ; the umbilical region is defined b}^ a strong rib. A thin. 



