142 PLIOCENE MOLLUSCA. 



They correspond closely with the Icelandic fossils in the Copenhagen Museum 

 alluded to above, which were called by Murch Urosdlpivx Bjornsoni. At first sight 

 they might be regarded as a dwarf variety of S. cosfifer. The typical English form 

 of that species, however, as stated above, is not known from the Iceland Crag, and 

 the one identified with the latter by Morch, which I have figured as var. idainlicn, 

 is very different from it. By the kind permission of Dr. Ravn I figure an Icelandic 

 specimen of ^S'. Bjornsoni from the Morch collection at Copenhagen to show its 

 resemblance to our Crag fossils. Most of the latter are about 15 mm. in length. 



I have little doubt that 8. Bjornsoni might be found elsewhere in the Red Crag 

 if specially looked for ; indeed, it has been recently obtained by the Messrs. Ogden 

 at Newbourn. A number of such small shells may have been overlooked, possibly 

 under the impression that they were immature and unrecognisable specimens of 

 some larger species. 



Fig. 9 seems allied to this form ; it may be a variety of it or possibly an 

 undescribed species. 



Searlesia Ravni, sp. nov. Plate XIV, figs. 15 — 17. 



Specific Characters. — Shell strong, fusiform; whorls (3, convex; ornamented by 

 well-marked longitudinal costee, not so wide as the spaces between them, which 

 disappear on the body-whorl, and by fine, wavy, close-set ridges ; suture deep ; 

 mouth oval, passing into a fairly long and open canal Avhicli is nearly straight ; 

 outer lip thin, somewhat expanded ; innei- lip adherent to the pillar. 



Dimensions. — L. 38 mm. B. 17 mm. 



Disfrilmtion. — Not known living. 



Fossil : Coralline Crag : Gomer pit, Gedgrave. Waltonian : 

 Little Oakley. 



Remarks. — I dedicate this shell to my friend Dr. Ravn, of the Geological 



Museum at Copenhagen, to Avhom I am so greatly indebted for allowing me 



to examine and figure many of Morch's type specimens from the Crag of Iceland, 



the study of which has thrown much light on some Crag problems. It belongs to 



the costifer group, of which variable species I should be inclined to regard it as a 



variety were it not for its straight fusiform canal and general appearance. It 



approaches S. Bjornsoni, moreover, on the other hand, and appears intermediate 



between it and the variety islandica of 8. castifer; I have several specimens from 



Oakley, though I have not found it at any other locality. There is one, however, 



in the Sedgwick Museum at Cambridge from Gedgrave (fig. 16) which seems the 



same, and it may be found possibly elsewhere if specially looked for. 



