Inferior Oolite in Gloucestershire. 419 



Q(i. Ceritella sculjita ; small, turretecl ; whorls few, long, nearly 

 Hat, each with three encircling striae, equidistant ; the body-whorl has 

 aix strife besides numerous others closely arranged at the base. 



Q7 • Ceritella tumidula ; small, smooth, much lengthened ; whorls 

 flattened, but slightly tumid at their upper junctions, body- whorl 

 symmetrical ; length f inch. 



G9. Scalaria pygmea ; shell minute; whorls seven, globose, the 

 last whorl much enlarged ; costse eight in a volution. 



70. Solarium Cotswaldice ; depressed, both upper and under sur- 

 faces nearly equally concave ; sides rather flattened, but with the bor- 

 ders rounded and furnished with numerous longitudinal elevations or 

 nodules, twenty-eight upon the lower and twenty upon the upper 

 border of the last volution ; the entire surface has numerous narrow, 

 crenated, encircling costse, crossed by very fine longitudinal lines not 

 always chstinct ; costse upon the sides of the last whorl about fourteen. 



74. Eulima parmda ; minute ; whorls five, convex, body- whorl 

 rather large ; apex obtuse. 



IQ)'^. Rissoina obtusa ; spire obtuse; whorls slightly convex, six; 

 outer lip moderately large ; costse numerous, closely arranged, slightly 

 curved from right to left. 



77 to 8!) inclusive. Cerithium ; the descriptions of the species of 

 this genus are omitted for the reasons given under the genus Sola- 

 rium, as are likewise of Nerincea 93 to 97 inclusive. 



101. Fusus obliquatus ; small, subcorneal, acuminated, longitu- 

 dinal ; costse about nine in a volution, passing obliquely from left to 

 right ; base with several large encircling striae, but the costse are not 

 continued to this part. 



102. Rostellaria unicornis ; spire lengthened, composed of many 

 whorls, whorls costated, the costse terminating in knobs on their up- 

 per portions ; costse ten in a volution, indented by five encircling 

 strise ; last whorl smooth, with a single prominent carina, hanng an 

 acute and elevated spire at one quarter of the circumference poste- 

 riori}^ from the outer lip ; the wing single, rounded, curved, slender 

 and produced ; caudal extremity moderately long. 



103. Rostellaria siinplex ; smooth ; whorls long, few, convex ; the 

 spire moderately elevated ; body-whorl with two carinse, the upper 

 one the larger, and forming two angles in its course ; caudal extremity 

 short. Only casts have been procured, but they are well characterized. 



104. Rostellaria spinigera ; spire elevated, acute ; whorls few, 

 each with seven prominent spines or spinous ribs ; body-whorl spined 

 above, grooved beneath; wing not digitated and but moderately ex- 

 panded ; caudal extremity straight and moderately long. 



105. Rostellaria solida; spire turreted ; whorls five, angulated by 

 a circle of elevated longitudinal spinous ribs crossed by lines ; body- 

 whorl with a single carina, beneath which are several deej) encircling 

 grooves ; wing simple, small, proceeding from the carina ; caudal ex- 

 tremity short. 



106. Rostellaria gracilis ; spire lengthened, smooth; whorls six, 

 lengthened, angulated, the angle being in the middle of the whorl 

 formina; an acute and crenulated carina ; body-whorl smooth, with two 



28* 



