MOLLUSCA. BUCCINID.E. Harpa- 



4, P. desertum Ovate, oblong, costated, transversely striated ; whorls con- 



tracted above by a rounded canal ; Up striated within — (Buc. Brander) f. 15. 

 Soiver. Min. Conch, t. ccccxv. f. 1. — In London Clay. 



Gen. LXXIV. MONOCEROS.— Aperture longitudinal, emar- 

 ginate retrally ; pillar reflected, with a tooth at the canal. 



314. M. hepaticus. — Whorls eight, with longitudinal ridges, 

 and a spiral tuberculated ridge at the top of each whorl. 



Buc. hep. Pult. Dorset 41. Mont. Test. Brit. 243. t. viii. f. I. — On the 

 English and Irish coast, rare. 

 Length an inch, breadth five-eighths ; colour brownish, sometimes spotted ; 

 whorls tumid, strongly divided, smooth, striated at the base of the body- 

 whorl ; outer lip thick, turning inwards to a denticulated edge. 



Gen. harpa.— Aperture ovate, lips smooth ; canal patulous 



on the right; pillar flattened, and pointed at the base; 



whorls with longitudinal ridges. 



1 . H. Trimmeri. — A fragment of a fossil species referred to the genus Har- 

 pa, from " its parallel compressed and obliquely inclined ribs, with the point- 

 ed angle at their summit, and the smooth columella," by Mr Parkinson, was 

 found in a stratum of dark pyritous clay (probably London Clay 9) at Brent- 

 ford, on the premisses of Messrs Trimmers — Org. Rem. iii. 59. 



Gen. LXXV. DOLIUM. — Shell ventricose ; aperture lon- 

 gitudinal, patulovis on the right ; spiral ridges entering the 

 inner lip. 



315. D. Perdix. — Ovate, spiral ridges depressed, and broader 

 than the intervening spaces. 



Buc. striatum fuscum. List. Conch, t. Dcccclxxxiv. f. 43. — B. Perdix, 



Linn. Syst. i. 1137- Pult. Dorset. 41. Mont. Test. Brit. 244. t. viii. 



f. 5. — On the English coast, rare. 



English specimens of the size of a nu^ ; yellowish-brown, mottled with 



white ; aperture ovate ; outer lip thin, inner piUar lip reflected, forming a 



cavity behind. 



EXTINCT SPECIES. 



1. D. nodosum. — Obovate, ventricose, with spiral rows of obtuse knobs. 

 Cast of a species of Dolium ? — Mant. Suss. IDG — D. nod. Soiver. Min. Conch, 

 t. ccccxxvi. ccccxxvii — Upper Chalk. 



Gen. LXXVI. BUCCINUM.— Shell ovate, aperture longi- 

 tudinal ; canal shghtly edged obliquely on the left ; pillar 

 rounded, somewhat gibbous and bent anteally. 



316. B. wwrf«^«<w.— Whorls seven or eight, ventricose, witli 



