STPTTO OLAVTT. 193 



obtained rnanj from the Pocderlien of Antwerp. It seoms a distinct form wliicli 

 can be easily separated from others; possibly it might be desirable to groui) the 

 present shell with the variety aftenuata as a new. species. The imperfect specimen 

 figured by Dr. Loric (oj>. eif.) may be perhaps the same. 



Sipho Olavii (Beck), Morch. Plate XXIII, figs. 5, 6. 



1871. Fiisjis (Sii)ho) Olavii (Beck), Morch, Geol. Mag., vol. viii, p. 396. 



(?) 1872. TrojihoB 2)ropinqtius, vav. confortvs, S. V. Wood, Mon. Crag Moll., 1st Snppl., p. 24, tab. ii, 



fig. 15 b. 

 1877. Sijiho Olavii, Morch aud Poulsen, MS. list and plates in Geol. Miis., Copenhagen, no. 14 o, 



pi. ii, fig. 8 (unpublished). 



Specific Gliaracters. — Shell somewhat thin, rather slender ; whorls 6 or 7, 

 l)ut slightly convex in the type, tapering to a depressed apex, the last, Avith the 

 canal, about two-thirds the total length, excavated below ; ornamented l)y numerous 

 fine and generally inconspicuous strias, closely crowded together on the upper 

 whorls, somewhat further apart and less regular towards the base of the shell; 

 suture more or less distinct : mouth ovate, angulate above ; canal long, sub- 

 cylindrical, tortuous or twisted, turning to the left ; pillar flexuous. 



Dimensions. — L. 36 — 50 mm. B. 16 — 20 mm. 



Distribution. — Not recorded living. 



Fossil ; Waltonian Crag : Little Oakley ; possibly elsewhere in 

 the Red Crag. 



Pliocene : Iceland. 



Remarks. — As stated above this species from the Crag of Iceland was described, 

 but insufficiently, by Morch under a name previously given to it by Beck, but 

 no specimen of the fossils upon which it was founded has been known hitherto in 

 this country. A figure of it appears, however, in one of Morch and Poulsen's 

 unpublished plates in the library of the Geological Museum at Copenhagen. I 

 have since been able to examine their collection, from which Dr. Ravn has been 

 good enough to send me some specimens for comparison. 



Morch's original description in 1871 stated as to two of his varieties of Sipho 

 Olavii that they were " Troptlion gracilis, Wood (Mon. Crag Moll., tab. vi, figs. IQa, 

 10 h), non ahsimilis," and it was probably on the strength of this that in his second 

 Supplement of 1879 (p. 7), the latter referred the Crag shells, here figured as 

 S. ciirtus, to Morch's species. Morch, however, had further stated that S. Olavii 

 was " parva, tenuinscula" and that it varied in length from 16 to 35 mm., 

 particulars which, appropriate to the Icelandic fossils, are inapplicable to those 

 referred to from the Crag. 



The specimens of S. Olavii which Dr. Ravn has lent me differ in form and in 



25 



