SIPIIO ELEGANS. 199 



specimen of tlie latter in tlie Noi'innn collection in wliicli it is sliown to Ix' distinctly 

 planoi'boid. 



Sipho exiguus, sp. nov. Plate XXIV, fig. 10. 



1872. Trophon Sabiiii, S. V. Wood, Mon. Crag Moll., 1st Suppl., p. 23, tab. ii, %. L5 c. 



Specific Glinracfprs. — -Shell small, turreted, fairly strong and solid ; whorls 7, 

 convex, regularly tapering ; ornamented by fine, but well-marked and regular 

 spiral lines; apex planorboid ; mouth oval, angulate al)ove, ending in a short and 

 open canal which turns slightly to the left. 



Dimensions.— h. 35 mm. B. 15 mm. 



Distribution. — Recent : Iceland. 



Fossil: Coralline Crag: Sutton. Waltonian : Little Oakley. 

 Butleyan : Butley ; probably elsewhere in the Red Crag. 



Pleistocene : Bridlington ; Christiania. 

 ■ Remarks. — -I have five or six specimens of a small, strongly sculptured SipJro from 

 Oakley, differing from anything else I have found at that place, but corres[)onding 

 to the one found by Mr. Leckenby at Bridlington, figured by Wood as Trophon 

 S((hini, which is now in the York Museum. In Wood's figure the spiral ridges are 

 shown only at the base of the shell, but an examination of the specimen proves this 

 to have been due to a mistake on the part of the artist. In the shell now figured 

 the apex is wanting, but in another very similar, in my collection, it is shown to be 

 planorboid. As I do not know any species of the SipJionorhis group to which it can 

 be referred, I have regarded it as an undescribed and distinct form. When 

 examining with Dr. Odhner the fine collection of Recent mollusca in the Zoological 

 Museum at Stockholm, I noticed several specimens from Iceland, apparently full- 

 grown, which appeared to correspond with our Crag shells. Dr. 0yen, moreover, 

 has shown me what appears to be the same form in the University Museum at 

 Christiania which I understand came from the Pleistocene deposits of that region. 



Sipho elegans, sp. nov. (ex Morch MS.). Plate XXIV, figs. 7, 8. 



1877. Bucclnopsis elegans, vai*., Morch and Poulsen, MS. list and plates in Geol. Mus. Copenhagen, 

 no. 25, pi. ii, fig. 6 (unjmblished). 



Specific Characters. — Shell ovato-f usiform ; whorls 5 or 6, but slightly convex, 

 the last two-thirds the total length ; ornamented by numerous and rather fine spiral 

 ridges closely crowded together, seen (with a lens) to be divided by an incon- 

 spicuous medial line, and by faint closely-set lines of growth ; spire regularly 

 diminishing ; apex obtuse ; suture well defined ; mouth ovate, angulate above ; 



