"2fl2 MANUAL OF THE MOLLUSCA. 



Fossil, nearly 100 species are enumerated by D'Orbigny, 

 ranging from the lias to the upper chalk ; many of them are 

 more nearly related to aporrhais [cerithiadce). 



EOSTELLABIA, Lam. 



Etymology, rostellum, a little beak. 



Synonym, Eusus, Humphreys. 



Example, E. curta. PI. IV., Pig. 4. 



Shell with an elongated spire ; whorls numerous, flat ; canals 

 long, the posterior one running up the spire ; outer lip more or 

 less expanded, with only one sinus, and that close to the beak. 



BistribuHon, 8 species. Eed Sea, India, Borneo, China. 

 Jtange, 30 fathoms. 



Fossil, SO species. Neocomian — chalk (= aporrhais?). 6 species. 

 Eocene — . Britain, Prance, &c. 



The old tertiary species have the outer lip enormously ex- 

 panded, and smooth-edged ; they constitute the section hippo - 

 chrenes of Montfort (e.g., Eost. ampla, Solander. London 

 clay). 



Sub-genus? Spinigera, D'Orbigny. 1847. Shell like rostel- 

 laria ; whorls keeled ; keel developed into a slender spine on the 

 outer lip, and two on each whorl, forming lateral fringes, as in 

 ranella. Possil, 5 species. Inf. oolite — chalk. Britain, Prance. 



Seeaphs, Montfort. (Terebellum, Lam.) 



Etymology, diminutive of terebra, an auger. 



Shell smooth, sub- cylindrical ; spire short or none ; aperture 

 long and narrow, truncated below ; outer lip thin. 



Distribution, 1 species. • China. Philippines, 8 fathoms. 

 (Cuming.) 



Fossil, 5 species. Eocene — . London, Paris. 



The animal of terebellum has an operculum like strombus ; its 

 eye-pedicels are simple, without tentacles. (Adams.) In one 

 fossil species, T. fusiforme, there is a short posterior canal, as in. 

 rostellaria. 



PAMILY II. — MURICID^. 



Shell with a straight anterior canal ; aperture entire behind. 



Animal with a broad foot; eyes sessile on the tentacles, cr at 

 their base ; branchial plumes two. Lingual ribbon long, linear ; 

 rachis armed with a single series of dentated teeth; uncini, 

 single. Predatory on other mollusca. The two species belong- 

 ing to the genus Cheletropis, Porbes -= Siiiusigera, D'Orbigny, 



