﻿LITTORINA. 



297 



Shell thick, trochiform, sub-eucycloid. Spire pointed, but with an obtuse 

 apex. Whorls about six, sutures moderately wide ; each whorl furnished with 

 three, or more often four, granulated spiral bands, the lowest being the most 

 prominent. 



The body-whorl is large relatively to the shell, and somewhat eucycloid, owing 

 to the prominence of the two lowest spirals. Number of spirals in the base five ; 

 axial strige moderately shown throughout. 



Aperture widely ovate, slightly flattened in front and angular at the point. 

 Outer lip thin and crenulated, inner lip very callous ; indications in some 

 specimens of an umbilical fissure. 



Relations and Distribution. — This form passes by easy stages into others 

 already named. Turbo Davidsoni, Laube, may be intermediate between this and 

 the species last described. In another direction Litt. Phillipsii has affinities with 

 Amberleya (Turbo) Meriani (PI. XXIII, fig. 17), but is smaller, has a wider spiral 

 angle, and is less turrited. Some Yorkshire specimens seem to connect this form 

 with Amberleya ornata. 



Typical specimens occur in the Grey Limestone of Cloughton Wyke and in 

 the upper beds of the Lincolnshire Limestone at Weldon and Ponton ; also in the 

 Humphriesianns-zone at Milborne Port. Specimens which might be referred to 

 this species occur in the Dogger at Blue Wyke and in the Pea-grit at Crickley. 



231. Littorina, cf. sulcata, Hebert and Deslongchamps, 1860. Plate XXIII, fig. 15. 



I860. Littorina sulcata, Heb. and Desl. Foss. Montreuil-Bellay, p. 55 (sep. 



C0 Py). pl- fig- 3 - 



Fig. 15 represents a unique specimen from the Parkinsoni-zone of Bradford 

 Abbas. It is characterised by the richness of its ornamentation and the width of 

 the interspiral spaces or furrows. The English specimen is more conical, and has 

 a smaller spiral angle ; the body-whorl also is relatively shorter and more angular 

 than is shown in the type figure. 



232. Littorina Weldonis, sp. nov. Plate XXIII, fig. 18. 



Description : 



Length . . . . .8 mm. 



Length of body-whorl to total height . . 52 : 100. 



Spiral angle .... 55°. 



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