TEREBRATULA. 271 



TEREBRA. (An augur, a piercer.) Fam. Purpurifera, Lam. Ento- 

 mostomata, Bl. — Descr. Subulate, elongated, pointed, turrited ; 

 spire long, consisting of numerous whorls; aperture small ter- 

 minating in a short, reflected canal ; outer lip thin ; columella 

 tortuous; operculum horny. The recent species are mostly 

 tropical.— Obs. Nearly all the species enumerated by Lamarck 

 and other authors are included by De Blainville in his genus 

 Subula ; those few species which that conchologist left in 

 the present genus, being shorter and more ventricose than 

 the others, approximate in shape to some of the Buccina, 

 and are distinguished by Mr. Gray under the generic name 

 Bullia. It seems strange, that De Blainville, being convinced of 

 the necessity of separating the two groups, and consequently 

 applying a new generic term to one of them, should have given 

 that term to the larger number and the more typical species of 

 the Lamarckian genus. Fig. 427, Bullia vittata. (Terebra.) Fig. 

 428, Terebra maculata. (Subula.) 



TEREBRALIA. Sw. A genus of " Cerithinae," Sw. thus de- 

 scribed : ' ' Outer lip much dilated, generally uniting at its base 

 to the inner lip ; leaving a round perforation at the base of the 

 pillar ; channel truncate ; operculum round : palustre. Mart. f. 

 1472." Sw. p. 315. 



TEREBRATING SHELLS. (Terebro, to pierce.) Shells which 

 reside in holes pierced in rocks, wood, &c. by means of some 

 corrosive secretion of the animal. Ex. Pholas, Teredo, &c. 



TEREBRATULA. Brug. (Terebratus, bored.) Fam. Brachio- 

 poda, Lam. — Order. Palliobranchiata, Bl. — Descr. Inequivalve, 

 equilateral, oval or sub-trigonal, ventricose or compressed, at- 

 tached by a tendon passing through an opening in the dorsal, or 

 upper and larger valve, the umbo of which advances beyond that 

 of the other valve ; hinge destitute of a ligament, with two teeth 

 in the dorsal valve, locked into corresponding cavities in the ven- 

 tral, or lower valve, and with two curious processes originating 

 at the umbo of the lower valve, presenting, in some species, the 

 appearance of fine winding tape, advancing towards the front of 

 the valve, and again receding to the centre, where the ends unite ; 



