LITTORINA. 253 



thick, imperforate, smooth, or obscurely engraved-striate ; light 

 yellowish to dark chocolate color, sometimes with two bands. 



Length, 12 mill. 



Northern Europe. 



It is L. littoralis, Forbes & Hanley, L. retusa, Lam., L. ustulatiis, 

 Blainv., L. neritiformis, Brown. 



Var. L. FABALis, Turton. Fig. 22. 



Light yellowish red, closely reticulated or zigzagged with darker 

 lines. Scarcely deserves to be distinguished as a variety, as many 

 of the darker colored specimens of the full-grown L. obtusata very 

 indistinctly preserve these markings. 



L. Beanii, Macgill., and L. vittata, Phil., are the same. 



Var. ^STUARii, Jeffreys. Fig. 23. 



Smaller, with more elevated spire, uniform greenish brown, the 

 aperture chestnut color. Length, 10 mill. 



Near Sutton, and at Manningtree, Suffolk, England. 



Inhabits between tide marks in brackish Avater. In deference to 

 Dr. Jeffreys' opinion, I quote the species here, but specimens re- 

 ceived from him, appear to me to be rather allied to L. littoralis 

 than to this species. 

 L. UMBiLiCATA, d'Orb. PI. 46, fig 24. 



Smooth, or with a few spiral strise anteriorly ; blackish or bluish 

 black. Length, 1'5 mill. 



Peru and Bolivia. 



Evidently a very young shell ; its mature characters it Avould be 

 unsafe to surmise. 



Section Lamellilitorina, Tryon, 1887. 

 L. ALBICANS, Metcalfe. PI. 46, figs. 25, 26. 



Whorls rounded, spirally linearly grooved, obtusely keeled at the 

 suture, last whorl lamellarly varicose, thin, semitransparent ; white, 

 purple tinted towards the apex, filleted with chestnut at the keel, 

 lip thinly reflected. Length, 22 mill. 



Sarawak, Borneo. 

 L. Ardouiniana, Heude. PI. 46, fig. 28. 



Spirally striate, thin, epidermis marbled with white, body whorl 

 with several longitudinal lamellae. Length, 20 mill. 



Along, Tonquin. 

 Described as a doubtful Leptopoma, and by Mr. Crosse, referred 

 to Littorina; very possibly a variety of L. albicans. 



