OF NOKTHUMBERLAND AND DURHAM. 51 



" the descriptions had, by some accident, been intermingled in 

 the Testacea Britannica." Specimens sent by Dr. Turton, under 

 the name of T. unidentatus, and now in the Newcastle Museum, 

 we find to be 0. imllida, though his description in the Con- 

 chological Dictionary is correct, being a copy of Montagu's. The 

 species described by Mr. Hanley under this name, in the Zoological 

 Proceedings, and in Thorpe's " British Marine Conchology," is, as 

 he informs us, the Auricida conoidea of Philippi ; his Odostomia 

 plicata being our 0. uiiidentcda. The 0. unidentata of Mac- 

 gillivray, and the figures given by Capt. Brown of his Jaminia 

 unidentata, do not appear to belong to this species. 



A variety, if not a distinct species, is found on our coast, ra- 

 ther narrower and more rounded at the base, and with a larger 

 umbilicus. As we have only met with two rather worn exam- 

 ples, we shall not attempt to decide upon it at present. 



2. 0. TURRiTA, Hanley. 



Odostomia turrita, Hanley in Zool. Proc, 1843. Thorpe's 

 Brit. Mar. Conch, xxxvi. f. 10. 

 In shell- sand at Tynemouth, rare. — /. A. 



3. 0. ALBELLA, Loven. 



Turhonilla alhella, Loven Index Moll. Scand. 19. " T. 

 turrito-conica, tenuis, anfr. 6 rotundatis, apertura fere 

 J t. t., ovata, vix eff"usa, plica parva, flfjui m." 



In sfiell-sand, Tynemouth and Cullercoats, rare. — J. A. 



Our shell agrees with the outline figure given by Professor 

 Loven in the "Ofversigt af Kongl. Vetenskaps-Akademiens 

 Forhandlingar," 1846, t. 1. f. 11. It is broader and less turreted 

 than the last. Both species have the tooth very small. 



There is yet another shell, which we find at Tynemouth, nearly 

 allied to these two, and to 0. 2^iicata, though apparently dis- 

 tinct. It is intermediate in form between 0. turrita and 0. 

 alhella, and has a stronger tooth. The species of this diflicult 

 genus are extremely perplexing, and require a careful study, to 

 which their rarity, especially in a living state, presents a great 

 obstacle. 



4. 0. PALLIDA, Mont. 



