MARSHALL : ADDITIONS TO " BRITISH CONCHOLOGY." 333 



inch in length by y 1 ^ th inch in breadth, and is much larger, coarser, and 

 more conical than any I have seen from the Mediterranean. In 

 addition to Monterosato's record, I can add the Algerine coast 51 f. 

 and Adventure Bank 92 f. ("Porcupine"). (In this connection I may 

 mention the recent discovery on the same ground of Rissoa hispidula 

 Monter. =R. clathrata Phil., another Mediterranean shell, and I 

 venture to predict that more Mediterranean species will be met with 

 in the same quarter). 



O. verticalis Marsh, n. sp. — Shell forming an attenuated cone, 

 rather solid, and somewhat glossy ; sculpture consisting of straight, 

 broad, and blunt longitudinal ribs throughout its whole length; these 

 ribs are wider than their interstices, and number sixteen on the last 

 whorl, disappearing just below the periphery, the base being smooth ; 

 colour white ; whorls seven (besides the embryonic ones), compressed 

 but not flat, the last occupying a little more than a third of the length ; 

 spire produced and tapering to a blunt point, which represents the 

 embryonic whorls ; these are exposed and inverted horizontally at the 

 apex ; suture rather shallow, and nearly straight ; mouth oval, acute- 

 angled above, gently curved at the outer edge, and rounded below ; 

 outer lip thin, and slightly flexuous and projecting ; inner lip reflected 

 on the pillar, which is sloping ; there is no umbilicus nor chink, and 

 no tooth outwardly visible. L. 0*2 in, b. o'o6. One specimen from 

 Bantry Bay. 



This shell is regularly conical, and not cylindrical in any part. It 

 is quite distinct from any of the abnormal forms of those species in 

 this section which have straight ribs, and with which I have compared 

 it. It resembles most an O. lactea with straight ribs, but the whorls 

 are individually longer than in that species or any of its congeners, 

 they are more compressed, and the apex is broader and blunter. As 

 there are many Bantry Bay shells in existing collections, I hope that 

 by this means more specimens may be brought to light. 



O. lactea L. — Not a variable shell as regards shape, but only as 

 regards the disposition of the longitudinal ribs. It can always be 

 separated from O. pusilla and O. innovata by the termination of the 

 ribs, which extend lower down the base and end abruptly; in the other 

 species they gradually evanesce from the periphery. The spire is 

 occasionally curved, though mostly the result of accident. It is most 

 abundant in the Channel Islands, but becomes gradually scarcer as it 

 approaches the northern coasts. A pretty S.calaria-\\ke example from 

 Jersey has a deeply-channelled suture and unusually oblique ribs. 



The var. paullula of Jeffreys is a conchological Mrs. Harris — 

 "there's no sich a person!" What Jeffreys meant for such was 

 O. pusilla var. mimiscula Marsh., the O. pusilla of Philippi being 

 unknown to Jeffreys as a British species. 



