Caiulus. MOLLUSCA. CAPULID^. 363 



2. I, oZi%MM»n.—Flatlish, smooth ; apex curved, adpressed, oblique ; inter- 

 nal plate two-tliirds the diameter of the mouth, and reflected near the pillar. 

 —Sotver. Min. Conch, t. xcvii. f. 1 — London Clay. 



3. I. tuberculatum — Gibbous, 'conical, oblique, rugosely tuberculated. 



(Trochus apertus, Brancler, t. i. f. 1, 2.) Sower. Min. Conch, t. xcvii. f. 4, 5. 



London Clay. 



4. I. echinulatum — Gibbous, depressed, conical, oblique; apex acute, 

 smooth; last turn obscurely echinulated. — Sower. Min. Conch, t. xcvii. f. 2.— 

 Plastic Clay. 



5. I. spinulosum. — Conical, apex acute, nearly central ; whorls obscure, 



surface covered with numerous short hoUow spines or small tubercles. 



Sower. Min. Conch, t. xcvii. f. 6. — London Clay. 



Gen. CREPIDULA. — Shell oblong, widely conical, with a 



depressed marginal spiral apex ; aperture in part closed by 



a projecting horizontal plate. 



1. C. sinuosa. — " Shell roundish oval, smooth, entirely milk-white ; with 

 the margin sinuate. Length half an inch ; breadth four-tenths. Found at 

 Scarborough in Yorkshire by Mr Bean. The outer surface is polished, and, 

 under a glass appears to be very finely and irregularly striate transversely ; 

 but it has no ribs, nor prickles, nor colourings of any kind."— Z)»- Turton, 

 Zool. Journ. No. vii. 364. t. xiii. f. 5. (The editors of the Journal add, " We 

 cannot agree with Dr Turton in placing this Crepidula on the British list, 

 as Mr Bean informed us that he took it from the bottom of a ship just ar- 

 rived from North America.") 



Gen. PILEOLUS. — Conical, a short internal spire ; aperture 

 in part closed by a projecting horizontal plate with a cre- 

 nulated margin, and an opposed prominent lip. 



1. P. plicatus. — Obtusely conical, witli diverging ridges extending to the 

 edge ; margin irregularly crenated, the centre of the base divided. — Sower. 

 Min. CoHch. t. ccccxxxii. f. 1-4. — In Oolite at AnclifFand Hinton. 



2. P. lavis.—SheU. rather flat, smooth, with an entire margin. Sower, 



Min. Conch, t. ccccxxxii. f. 5-8 — Found along with the last. 



capulidj:. 



Gen. LXXXVII. CAPULUS.— Shell conical, with the apex 

 towards the margin recurved and subspiral ; muscular im- 

 pression semicircular ; foot complicated on its anterior 

 margin ; gills in a single series across the branchial cavity, 



359- C. hungaricus. — Shell acuminated at the spiral apex, 

 and divergmgly striated. 



The Fool's-cap, Borl. Corn. 276. t. xxviii. f. 4 Patella ungarica, Linn. 



Syst. i. 1259. Perm. Brit. Zool. iv. 143. t. xc. f. 147. Don, Brit. 



