452 DENTALIAD^. 



Dentaiium striatum, Mont, (not authors) Test. Brit. vol. ii. p. 49'2, and Suppl. 

 p. 156 (probably). 

 „ Tarentinum, Lam. Anim. s. Vert. (ed. Desli.) vol. v. p. 596. — Hanl. 

 Brit. Marine Conch, p. xvii. f. 6. — Deles. Rec. Coq. 

 pi. 1, f. 4. 

 „ dentalis,* Turt. (not authors) Conch. Diction, p. 37. — Flem. Edin. 

 Encycl. p. 66. — Brit. Marine Conch, p. 2. — Brown, 

 Illust. Conch. G. B. p. 117, pi. 56, f. 8. 

 „ laUatum, Turt. Conch. Diction, p. 38. — Brit. Marine Conch, p. 3. — 



Brown, Illust. Conch. G. B. p. 117, pi. hQ, f. 4, 5. 

 „ politum, Turt. (not authors) Conch. Diction, p. 38. 

 „ lave, Turt. Conch. Diction, p. 256. — Brit. Marine Conch, p. 3. 

 , entale (fossil), Searles Wood, Crag Mollusca, p- 169, pi. 20, f. 2, a, b. 



The tube of this Derdalium presents much similarity to 

 the preceding, but cliiFers very essentially in the characters 

 of its hinder extremity. It is strong, cylindraceous, com- 

 paratively sudden in its attenuation, moderately arcuated, 

 and of a nearly opaque and squalid white, occasionally 

 tinged with rose-colour at its narrower end, and sometimes 

 variegated with ochraceous rings. The general surface is 

 not highly polished but only moderately shining; it is 

 smooth in the adult, but in the young, and towards the 

 posterior termination of mature examples, fine, equal, and 

 very numerous (about thirty) raised longitudinal striae are 

 apparent, that, for the most part are narrower than their 

 interstices, and are frequently preceded by, or intermingle 

 with, very minute longitudinal striulse, which are often 

 visible when from the truncation, so common in this species, 

 the terminal costellar strlse are absent. The posterior end 

 of the younger and middle-aged examples tapers to a very 

 fine point, but never displays either fissure or emarginatiou ; 

 when excised, as it generally is in the adult, the reparative 

 tube is very slender, all but entire, occasionally rather pro- 

 duced, and never dilated at the extremity. 



The majority of specimens are much shorter than D. 



* The diagnosis of dentalis in the Linna;an Transactions (vol, viii. p. 237), 

 being copied from the "• Systeraa Naturse," does not apply to any British species. 



