ins PLIOCENE MOLLUSCA. 



1841-70. Cancellaria Gouthouyi, Gould, Inv. Mass., ed. 1, p. 283, fig. 190, 1841 ; C. viridula, ed. 2, 



p. 391, fig. 652, 1870. 

 1849. Cancellaria (Tritonium) viridula, var. A 1 , aa, Middendorff, Mi'm. Acad. Imp. Sci., St. Peters- 



bourg [6J, vol. vi, p. 439, pi. x, figs. 1, 2. 



1871. Cancellaria Couthouyi, A. Bell, Ann. May. Nat. Hist. [4], vol. vii, p. 354. 



1872. Cancellaria (Admete) viridula, var. Couthouyi, S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. i, 

 p. 97, pi. vi, fig. 12. 



1872. Admete viridula, Dawson, Canadian Nat. (u.s.), vol. vi, p. 396, pi. vi, fig. 7. 



1872. Admete Couthouyii, A. and R. Bell, Proo. Geol. Assoc, vol. ii, p. 209. 



1876. Admete undato-costata, Verkriizen in Kobelt, Jahr. malak. Ges., vol. iii, p. 372, pi. iv, fig. 6. 



1878. Admete viridula, var. undato-costata, G. O. Sars, Moll. Reg. arct. Norv., p. 217, pi. xiii, fig. 16. 



1886. Admete viridula, Friele, Norske Nordh. Exped. (Mollusca), pt. ii, p. 24, pi. viii, figs. 27-30. 



1887. Admete viridula, var. abnormis, Morch and Poiilsen, MS. list and Plates in Geol. Mus., Copen- 

 hagen, no. 31, pi. iv, fig. 10 (unpublished). 



1915. Admete Couthouyi, Johnson, Bost. Soe. Nat. Hist., Occas. papers, vol. vii ; Faun, of New Engl., 

 pt. xiii (Mollusca), p. 140. 



Varietal Characters. — Differs from A. viridula in its shorter spire, its ventricose 

 body-whorl and sometimes in its finer and ecostate sculpture. 



Distribution. — Recent: Arctic and North American, from Siberia to the New- 

 England coast. 



Fossil: Coralline Crag : Boyton. Newbournian : Waldringfield. 

 Butleyan : Butley. Iceland Crag. 



Pleistocene : Bridlington, Montreal. 



Remarks. — In his 1st supplement of 1872 (op. cit.) Wood figured a specimen 

 of Admete from Butley which had been identified by Mr. Bell with the American 

 A. Couthouyi of Jay. It had a shorter spire, more tumid whorls, and finer sculpture 

 than the typical A. viridula, corresponding closely with Verkri'izen's var. undato- 

 costata of that species, figured and described by Prof. G. O. Sars in 1878, which 

 was said to be ventricose with a short spire. 



There is a specimen at Jermyn Street which I am permitted to figure, belonging 

 to the same group but without the longitudinal costae of the Butley shell. In the 

 latter respect this agrees with an example of A. viridula represented by Midden- 

 dorff, and to a somewhat less extent with another given by the late Sir J. VY. 

 Dawson (op. cit.) from the Pleistocene of Montreal. 



Taken as a whole they seem to be distinct from the typical A. viridula, having 

 a general relation to one another and to the American A. Couthouyi. Following 

 Wood, therefore, I retain the latter for them as a varietal name. 



The specimen figured by Morch and Poulsen as A. viridula, var. abnormis {<>}>. 

 cit.) seems to be the same as our shell. 



