312 ZOKITES. 



tilage, the ligament being spread over the areas ; muscular im- 

 pressions, one on each valve, sub- central, oblong. — Obs. This 

 genus differs from Ostrsea in the equality of the valves, and in 

 having a hollow pit in the hinge for the cartilage. Vulsella lin- 

 gulata, PI. si. fig. 185. 



WATERING-POT. Aspergillum, fig. 44, commonly so called 

 on account of the resemblance of its perforated termination to 

 that of the spout of a watering-pot. 



WEISTTLE TEAP. Scalaria pretiosa, commonly so called. 



WHOE-L. A complete turn or revolution round the imaginary 

 axis of a spiral shell. The last whorl is called the body-whorl. 

 The whorls are described as non-contiguous, when they do not 

 touch each other ; continuous, in the opposite case. Depressed 

 when they are flat. They are angulated, keeled, or coronated ; 

 distinct, or indistinct. They are sometimes, as in Cyprsea, 

 hidden by the last whorl. 



TETTJS. Adanson. Ctmba, Broderip. 



XTLOPHAGrA. Turton. Q,v\ov, zylon, wood ; 0ayw, phago, to 

 eat.) Fam. Tubiscolse, Lam. — Descr. Equivalve, globose, closed 

 at the back ; with a large, angular hiatus in front ; hinge with 

 a small curved tooth advancing from beneath the umbones in 

 each valve. — Obs. This shell, which is found in a cylindrical 

 cavity, eaten in the wood by the animal, resembles Teredo, but 

 has not the shelly tube, nor the posterior hiatus. X. dorsalis, 

 Pt. X. fig. 50, 51. 



XTLOTEYA. Leach. Xtlophaga, Sow. 



ZAEIA. Grray, 1840, A division of the genus Turritella repre- 

 sented by T. duplicata, &c. 



ZIEELIAISTA. Gray. The short strombiform, thick-lipped spe- 

 cies of Mitra. M. Ziervogelii. 



ZIEE^A. Leach. 1817. Pholas crispata, without accessory 

 valves. See Monograph of Pholas, Sowerby's Thesaurus Con- 

 chyhum. No. 10, fig. 37. 



ZONITES. Montf. A genus formed of Helix Algira, and other 

 similar species with depressed spires and large umbilici ; in- 

 cluded in the sub-genus Helicella. PI. xiii. fig. 279. 



