342 MOLLUSCA. BUCCINID^E. Harfa. 



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

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



Sou-er. 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. 1 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. HARP A.— 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?) at Brent- 

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



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

 gitudinal, patulous 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 nut ; yellowish-brown, mottled with 

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

 cavity behind. 



EXTINCT SPECIES. 



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

 Cast of a species of Dolium ? — Mant. Suss. 196 — D. nod. Sower. Min. Conch, 

 t. ccccxxvi. ccccxxvii. — Upper Chalk. 



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

 tudinal ; canal slightly edged obliquely on the left ; pillar 

 rounded, somewhat gibbous and bent anteally. 



316. B. undatum.— Whorls seven or eight, ventricose, with 



