SIPHO PROPINQUUS. 195 



but they afford another illustration of the difficulties surrounding the student 

 of the Crag mollusca. 



It should be stated that whereas the Icelandic specimens of what I have named 

 S. Olavii, var. Murchii, have the slightly distorted apex cliaracteristic of the ty[)ical 

 Sijjho, it is regularly spiral and planorboid, as in *S'. fortuoms, in the Oakley fossils 

 which I identify with tliem.^ Discussing the matter in Paris with MM. Dollfus 

 and Cossmann, and afterwards with M. Dautzenberg, submitting the specimens of 

 both to them, they all expressed a very confident opinion that this presented no 

 real difficulty, agreeing in my identification of the Oakley shells with Morch's speci- 

 mens from the Iceland Crag. Both 8. Olavii and its var. Morchli seem to belong 

 to the S. tortnosns group. As to this, however, it may be remarked that neither 

 the typical form of the latter species, as just stated, nor any of the varieties of it 

 here described, have been recorded at present from the Pliocene of Iceland. 



Var. conulus, no v. Plate XXIII, fig. 14. 



Dimensions. — L. 2-4 mm. B. 11 mm. 



Distribution. — Not known living. 



Fossil : Newbournian Crag : Waldringfield. 



Bemarks. — The specimen figured under the above name is one of two now in 

 the York Museum which were found many years ago at Waldringfield by Mr. A. 

 Bell. 



They are somewhat similar to one of the varieties of 8. Olavii at Copenhagen, 

 and may be regarded, I think, either as immature, or as a dwarf form of that 

 species, resembling the typical form in its delicate spiral sculpture, its long and 

 semitubular canal and its conical spire, but differing in size and in its relative 

 proportions. 



Sipho propinquus (Alder). Plate XX, figs. 8, U. 



1850. Fusus propinqmis, Alder, Trans. Tjnes. Nat. Field Club, vol. i, p. 157. 

 1853. Fusits propiwpius, Forbes aud Hauley, Brit. Moll., vol. iii, p. 419, pi. ciii, fig. 2. 

 1867. Fiisus propi/iqious, Jeifreys, Brit. Couch., vol. iv, p. 338, pi. Ixxxvi, fig. 3. 

 1870. Tritonium propinquum, S. V. Wood, juu., Quart. Jouru. Ceol. Soc, vol. xxvi, p. 92. 

 1881. Neptunea (Sipho) yropitiqua, Kobelt, Martiui und Chemnitz, Couch. Cab., ed. 2, vol. iii 

 (PurpuraceiJe), p. 79, pi. xxv, fig. 8. 



1 The matter is still further complicated, however, by the fact that in Morch's original description 

 in the Geol. Mag., vol. viii, p. 39G, he states as to the apex of S. Olavii that it is "Littorinam obtusatam 

 non ahtiimilis." Tiie apex of L. obtusata is distinctly planorboid. 



