36 LITTORINIDiE. 



L. PATULA, Jeffreys. 



Subglobose, not particularly solid, almost always marked with 

 raised wrinkles or ridges. Whorls four, at most five ; the penult 

 not shelving above, but abruptly swollen, and peculiarly longer 

 than the preceding turn. Spire short ; apex bluntish. Aper- 

 ture rounded oval, not diminished in size by any broad basal con- 

 fluence of the very prominent outer lip, whose superior junction 

 with the body-whorl is more or less rectangular : pillar lip not 

 produced, rounded anteriorly. 



Plate LXXXV. fig. G to 10, and (Animal) Plate G. G. fig. 2. 



9 Turbo jugosus, Mont. Test. Brit. vol. ii. p. 586. — Turt. Conch. Diction, p. 196, 

 from which Brit. Marine Conch, p. 257, as Littorhiajufjosa. — 

 DiLLW. Recent Shells, vol. ii. p. 820. 

 „ „ Rackett, Dorset Catalog, p. 49, pi. 19, f. 1. 



Littorina patula, Jeffreys, Brit. Marine Conch, p. 259, f. 7. 



„ lahiata, Brown, Illust. Conch. G. B. p. 16, pi. 10, f. 20, 21, 

 „ rwlissima, Alder, Catal. Moll. Northumb. and Durham, p. 55. 



The largest example of this species delineated in our 

 engravings, presents a remarkable degree of likeness to 

 some of the stunted and costellated forms of tenehrosa ; 

 so much so, indeed, that we do not venture positively 

 to assert the specific distinctness of the two shells. 

 Since, however, the examination of a long suite of spe- 

 cimens, has not clearly proved to us the union of the two, 

 we have preferred to retain a constituted species, rather 

 than wrong the author of it, by too hasty a suppression. 

 The chief distinguishing characters appear to be the 

 remarkable swell of the penult whorl, and its extreme 

 dorsal length compared to the shortness of the succeeding 

 volution. Tlie absence of all indication of this character 

 in Montagu's figure of jugosa prevents our recognition 

 of his species, although his description of that shell apj)lies 

 better to the present Littorina. than to any other we arc 

 acquainted with. 



