GENERA AND SPECIES. 143 



346. duminyi, % in. whorls 5 ; umbilicus extended over base of 



shell. 

 339- granlandtcus, in. whorls 6. 



Over ^ in. 



354. occidentalis, whorls 7 or 8 ; shell opaline and pyramidal. 



341. amabilis, in. whorls 7; shell white and pyramidal. 



342. magus, % in. whorls 8 ; shell white, variegated with red, 



a depressed cone, thick and rounded. 



343. tumidus, J in. whorls 6 or 7 ; shell white, speckled with 



brown and turreted. 



344. cinerarius, % in. whorls 6 or 7 ; shell grey, finely reticulated 



and conical. 



345. umbilicatus, in. whorls 6 or 7 ; shell grey with pink reticu- 



lations and conical. 



347. lincatus, i in. whorls 6; shell greenish grey with purple 



reticulations, thick, rounded and conical. 



Trophon. (MURICIDjE.) Plate xxvi. 



503. muricatus, f in. canal long, whorls 7 or 8, angulated and 



flattened above. 



504. barvicensis, f in. canal long, whorls 7 or 8, bearing spines 



above. 



505. truncatus, f in. canal short, whorls 6 or 7, rounded. 



Truncatella. (TRUNCATELLIDJE.) Plate xxiii. 

 399. truncatula, $ in. shell short, cylindrical and turreted. 



TurriteUa. (TURRITELLID&.) Plate xxv. 



452. terebra, 2% in. shell a long close spiral with an angulated 



base. 



Unio. (UNIONID&.} Plate vi. 



55. margaritifer, 5 in. x 2f in. oblong, lower margin straight. 



56. pictorum, 3 in. x ij in. oblong, beaks with small tubercles not con- 



fluent, anterior teeth compressed and 

 crenulated. 



57. tumidus, 3 in. x ij in. oval, beaks with angular wrinkles, confluent 



and concentric, lower margin curved. 



Valvata. (VALVATID&.) Plate xxiv. 



441. cristata, in. whorls 5, shell a flat coil. 



442. piscinalis, in. whorls 6, shell a broad cone. 



Velutina. (LAMELLARIID&.) Plate xxiii. 

 378. plicatilis, % in. whorls 2^, sculpture indistinct. 



379 Icsvigata, f in. whorls 31, sculpture distinct. 



Venerupis. (VENERID&.} Plate x. 

 127 irus, i in. x \ in. shell having thin concentric ridges. 



