J. Starhie Gardner — On the Gault Aporrkaidce. 297 



body-whorl is gently rounded and nearly smooth, or with a few 

 spiral striae only, near the suture. The penultimate whorl is also 

 free from transverse ribs. The lip is very large and expanded, pro- 

 duced above into a long linear spur. In front the lip has two other 

 diverging spurs of a lanceolate form. The canal is long, and very 

 slender. Length 2^, breadth 1^ inches. 



The specimen described by Edward Forbes is from the Atherfield 

 Clay, and the spire has quite perished, but the form of the wing is 

 still perfectly distinct. Other specimens, in the Geol. Soc. Museum, 

 from the Cracker rocks, are very distinct, and show very delicate 

 striae all over the upper whorls. Fitton in the Quart. Journ. vol. iii. 

 gives it an extended range at Atherfield in the Cracker group, viz. 

 beds 5 and 5a, 6 and 9. 



Aporrha'i's Dupiniana, D'Orb. PL VII. Fig. 13. 



Description. — Shell elongated, composed of angulated whorls ; the 

 angles or keels of each are situated considerably posterior to the 

 middle of the whorl, and are ornamented by a row of large and 

 strongly marked tubercles on the convexity. On the last whorl 

 there is a salient keel, together with two others less pronounced, 

 anterior to it ; these three keels appear to preserve faint traces of the 

 tubercles. The pterygoid expansion of the outer lip is not preserved 

 in the only specimen I have examined, but Pictet and Campiche 

 describe it thus, — " The wing is large ; the principal carina is pro- 

 longed in a recurved point : there is a sort of webbing or ' palmure ' 

 between this point and the spire, the wing forming an expansion 

 attached to the first whorls. In front of the keels the two other 

 ribs form digitations but little marked, and which we only imperfectly 

 know. The mouth is narrow and very incrusted, its lip being 

 thickened. All the shell is covered with longitudinal striae, of which 

 one is alternately larger than the other." The shell seems strongly 

 to have resembled A. pes-pelicani, especially in the attachment and 

 thickening of the lip. 



History. — Named R. Dupiniana by D'Orbigny in the Pal. Fr. Terr. 

 Cret. vol. ii. p. 281, pi. 206, f. 1-3, and Chenopus Dupiniana in the 

 Prodrome. After being mentioned by various authors, it was re- 

 described and figured by Pictet and Campiche in the Terr. Cret. de 

 Ste.-Croix, p. 589, pi. xcii. f. 1-3. 



Distribution. — Found in the Lower Greensand of Sandown, and in 

 both the Aptien and Neocomian beds of France and Switzerland. 



EXPLANATION OP PLATE VII. 



Fig. 1. — Aporrhais ParMnsoni, var. Cunningtoni, Gardner. From a specimen lately 

 purchased from Mr. Cunnington, by the British Museum, Devizes. 



Fig. 2. — A. Macrostoma, Sowerby. From the original specimen, now in the 

 Bristol Museum, Blackdown. 



Fig. 3. — A. Moreausiana, D'Orb. Atherfield. 



Fig. 4. —A. Fittoni, Forbes. This and the preceding are in the Brit. Museum. 



Fig. 5. — A. histochila, Gardner. Drawn from a specimen in the Geol. Museum, 

 Jermyn Street. From Devizes. 



Fig. 6. — A. histochila, Gardner. From a cast, Cambridge. 



Fig. 7. — A. oligoehila, Gardner. From a specimen in author's cabinet. Grey Chalk. 



