150 PLIOCENE MOLLUSCA. 



Varietcd Characters. — Differs from the type-form in its somewhat longer mouth, 

 its shorter spire, and in having a number of inconspicuous plications which die out 

 towards the base of the shell. 



Dimensions. — L. 45 — 50 mm. B. 16 mm. 



Distribution. — Not known living. 



Fossil : Pliocene : Iceland. Pleistocene : Yoldia-clay, Christiania 

 region. 



Bemarhs. — The shell here figured is from the Morch collection of Icelandic 

 fossils at the Copenhagen Museum. It corresponds very nearly with that figured 

 by Prof. Br^gger (op. cit.) from the Yoldia-clay of Norway, as to which he says 

 that it is allied to 8. virgatus, Friele. It seems also to form a connecting link with 

 A. alius of the English Crag, although it is more slender than the type-form of that 

 species. 



All the shells referred to this genus in the present memoir are similar in 

 texture, differing in that respect from that of the true Siphos which are usually 

 strong, compact and solid. Anomalosiplio is comparatively thin and fragile, the 

 loose texture of the shell resembling more or less nearly that of Parasipho Kroijeri. 



Anomalosipho altus (S. V. Wood). Plate XV, fig. 6. 



1848. Tro2>hon altus, S. V. Wood, Men. Crag Moll., pt. i, p. 47, tab. vi, fig. 13. 



Specific Characters. — Shell not very solid, fusiform, turreted; spire elongate 

 with an obtuse apex ; whorls 7 — 8, convex, regularly diminishing in size, the last 

 more than half the total length ; ornamented by exceedingly fine and delicate spiral 

 striae, and by inconspicuous and sometimes nearly obsolete longitudinal ribs ; suture 

 distinct, oblique ; mouth ovate, angulate above ; outer lip thin ; canal very short, 

 turning slightly to the left. 



Dimensions. — L. 40 — 50 mm, B. 16 — 22 mm. 

 Distribution. — Not known living. 



Fossil : Butleyan Crag : Butley. 

 Bemarhs. — I include in the present species some shells that have been found 

 living on the coast of Norway, near Bear Island and Spitzbergen, with a small 

 group of others that are fossil in the Red Crag. 



The specimen of the typical form here represented was found by Mr. Kennard 

 at the Neutral Farm pit at Butley, from whence so many interesting fossils have 

 been obtained. It shows the delicate spiral sculpture characteristic of this group 

 more clearly than does the figure given by Wood. 



A 



