194 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 21, 



Terebra obconica, n. s. Pl. XX. fig. 5 a & 5 b. 



Shell turreted ; spire formed of numerous volutions arranged in 

 regular steps ; whorls smooth, angular above, flattened at the side 

 and slightly wider above than below; a groove at the angle of the 

 whorl left by the posterior canal : aperture lozenge-shaped. 



Length about 1| inch ; diameter f of an inch. 



Spiral angle 15°. Sutural angle 80° to 85°. 



In subcretaceous limestone at Cape Espichel. 



This is a remarkably shaped shell, the spire appearing as if formed 

 of a set of reversed cones inserted one within another. 



Plate XX. fig. 5 a. Exterior. 



Fig. 5 b. Section. 



Turbo Mund^, n. s. Pl. XX. fig. 7 a & b. 



Shell depressed, heliciform ; spire very small, of three or four 

 volutions : whorls tumid, increasing very rapidly, ornamented with 

 transverse, tuberculated striae, crossed by strongly marked lines of 

 growth, the tubercles being at the intersection of the lines ; the upper 

 part of the whorl is also ornamented with reflexed, tuberculated 

 plications. 



Diameter ^ of an inch. 



From subcretaceous limestone at Figueira, at the mouth of the 

 Mondego. 



A very elegant httle shell, which has some resemblance to T. pli- 

 catilis, Desh. 



Plate XX. fig. 7 «. Natural size. 



Fig. 7 b. Magnified. 



Turritella Cintrana, n. s. Pl. XX. fig. 6 a & b. 



Shell turreted ; spire of six or eight gibbose whorls ornamented 

 with smooth, projecting, transverse ribs, crossed by very faint lines of ^ 

 growth : ribs increasing in number from two on the upper to five on ' 

 the lower whorls, the two middle ribs constantly larger than the others. 



Length 1^ inch ; breadth j an inch. 



Spiral angle rounded, varying from 50° in the young to 25° in the 

 old shell. Sutural angle 100°. 



Abundant in shale of the subcretaceous series in the cliffs at the ' 

 Praia de Ma9ams, north of the Cintra hills. 



Plate XX. fig. 6 a Si; 6 b are two specimens of different age. 



Turrtlites Beirensis, n. s. Pl. XXVI. fig. 6. 



Shell nearly flat ? with a very low spire ? composed of rounded 

 whorls, of which about one-third is concealed by the outer whorl, 

 ornamented with fasciculated ribs, and a slightly elevated line along 

 the middle of the back ; umbilicus large and smooth ; about thirty 

 strong, elevated ribs rise close to the umbilicus, each of which soon 

 divides into three or four finer ribs which run nearly straight and 

 of a uniform size to the slight keel on the middle of the back, where 

 they do not meet the ribs from the other side of the whorl, but usually 

 alternate with them ; back very round ; aperture broadly lunate. 



Diameter H inch. 



