24 DUNDRY GASTEROrODA. 



LITTORINA BIAIIMA.TA, Muenster. 



1844 Trochus biarmatus, Muenster. Goldf. Petr. Germ. 



tab. 180, fig. 2. 

 1858 Trocbus monilitectus, Oppel. Juraf. p. 385. (non 



Phillips, necMorr. & Lycett.) 



1858 Quenstedt. Jura. tab. 57, 



figs. 3, 4, p. 416. 

 1869 Brauns. Mittel-Jura,p.l82 



Length 13 mm. 



Our specimens, which are well preserved, agree exactly with 

 Goldfuss' delineation. There are three bands on each whorl, the 

 middle one not half-way between the others, but closer to the 

 inferior one ; these bands are crossed by sharp elevated costae, 

 oblique in direction, which rise into tubercles at the place of 

 crossing. 



I cannot follow Oppcl or Dr. Brauns in identifying this shell 

 with T. monilitectus, Phillips. From the character of the mouth 

 I prefer to place it in the genus Littorina. 



We have four specimens. 



Locality — Dundry. Inf. Ool. 



LITTOEINA RECTE-PLANATA, n. sp. PI. 2, fig. 6. 

 Length 13 mm. Greatest breadth, 9 mm. 



Shell conical, acute. Whorls straight- sided, separated by 

 deeply-impressed sutures, and ornamented with four elevated 

 bands, which are somewhat tubercular. The intervals between 

 the bands are crossed by numerous strong, oblique, curved lines ; 

 these extend also, and are still more pronounced between the 

 sutures and the nearest bends. 



The last whorl is subangular ; there are four ridges above the 

 angle, the base is convex, and has five ridges. The mouth is 

 trapezoidal. 



