SlPilO TORTUOSLIS. 191 



G. 0. Sars' collection at the Museum of Zoology at Cliristiania, I aiu compelled to 

 doubt Avhether the fossils figured by Wood under this name were correctly 

 identified,^ but I have some in my own collection from Oaklej^ most of • them 

 immature, which more nearly correspond with them. 



The typical S. fortnosiis seems especially characterised by its A-ery fine and 

 regularly chiselled spiral sculpture, and by its long, narrow, twisted and semi- 

 tubular canal ; the upper part of the spire, moreover, is sometimes distorted. 



In the Crag form of S. tortvoi^iis the body-whorl is more tumid than in Dr. 

 Sparre Schneider's specimen, resembling more nearly that figured i)y Prof. Kobelt 

 in 1887 (oj). rif., vol. i, pi. xii, fig. 7). 



Var. turrita, M. Sars. Plate XXIII, figs. 15, IG. 



1858. Tritoniiim fiirrttnm, M. Sars, Forh. Vidensk. Selsk. Christ., p. 39. 



1881. Neptunea {Sijplio) turrita, Kobelt, Martini und Chemnitz, Conch. Cab., ed. 2, pt. iii (Pur- 

 puracese), p. Ill, pi. xxxviii, fig. 4. 



1882. Sipho tortuosus, var. turrita, G. O. Sars, Moll. Eeg. Arct. Norv., p. 272, pi. xxv, fig. 11. 

 1910. Siphonorlis turritus, Odhner, K. Svensk. Vet. Akad. Haudl., vol. vii, jj- 14. 



Dimensions. — L. 30 mm. B. 12 mm. 



DistrUmfion. — Recent ; Finmark, Iceland. 



Fossil : Coralline Crag : Gedgrave. 



Remarhs. — The fossil here represented (fig. 16) is one I obtained many years 

 ago at Gedgrave, where at that time it was occasionally met with ; it may occur 

 rarely at other horizons of the Crag, but I have no note of the fact. 



Prof. G. 0. Sars figures a specimen under the above name from his father's 

 collection, which corresponds more or less closely in form with our fossil, but is 

 larger. The canal is nearly straight and not distorted, as in the typical form of 

 8. tortuosus. He says, however, that the sculpture of this variety is less distinct 

 than in the type ; in the Crag specimens, on the contrary, it is somewhat more so. 

 The latter are considerably smaller than that figured by Prof. Sars, but larger than 

 a specimen from the Lofoten Islands (fig. 15), Avhich Dr. Nordgaard was kind enough 

 to send me. The spiral sculpture of the latter is exceedingly fine and delicate, as 

 is that of the Coralline Crag shell. By some authorities this form is regarded as 

 specifically distinct from S. tortuosus. 



Var. attenuate, G. 0. Sars. Plate XXIV, figs. 5, 6. 



1878. Sipho tortuosus, var. atteriuata, G. O. Sars, Moll. Eeg. Arct. Norv., p. 273, pi. xv, fig. 5. 



1887. Neptunea atteriuata, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. i, p. 78, pi. xiv, fig. 12. 



1887. Fusus tortuosus, var. attenuata, Aurivillius, Vega Exped. Vet. Jakt., Stockholm, vol. iv, p. 368. 



1 See Mon. Crag Moll., 2nd Suppl.. p. 7, 1879. 



