334 Transactions. — Geology. 



longitudinal ribs are obsolete, except at the suture, where they are 

 tolerably strong ; the spiral ribs are strong and irregular, the 

 intermediate grooves sometimes as broad as the ribs, sometimes 

 narrower. Aperture oval, with a very short anterior canal ; the 

 sinus deep, situated some distance below the suture. Length, 

 0-92 ; breadth, 0-38 ; aperture, 0-42 inch. 

 Locality. Wanganui. 



Deillia jEquistriata, n. s. 



Whorls 8; the first 1% embryonic, smooth, and expanded into 

 a papilla, the others spirally striated and longitudinally ribbed 

 in the centre, except the body whorl, on which the longitudinal 

 ribs become gradually obsolete. There are 15 oblique longitu- 

 dinal ribs on a whorl, crossed by numerous low and subequal 

 spiral ribs. Sinus area concave and covering the suture, but 

 spirally ribbed like the rest. Aperture oval ; canal very short ; 

 posterior sinus small but distinct ; the inner lip with a large 

 posterior callus. Length, 0*75 ; breadth, 0-2 ; aperture, 0.34 

 inch. 



Locality. Petane. 



The spiral sculpture is much stronger than in D. alabaster. 



NATICA DARWINn. 



Natica solida, Sowb., in Darwin's " Geol. Obs. on South America," 

 p. 255, pi. iii., f. 40-41(1840); Zittel "Eeise der Novara," Palre, p. 42, 

 taf. xv., f. 6 ; not N. solida, Blainville, Malac, pi. 36, f. 8 (1825). 



As Sowerby's name must sink into a synonym, I have called 

 this species after the illustrious naturalist who collected it. 



Natica (Nevekita) gibbosa. 

 Natica solida, " Cat. Tertiary Moll, of N.Z.," in part. 



Shell large, solid, smooth, globose, the spire almost buried ; 

 the body whorl gibbous posteriorly. Aperture semicircular, the 

 columellar callus very large, filling the posterior portion of the 

 aperture, and eventually covering the whole umbilical region. 

 Length, 2 - inch ; breath, 2* inch. 



Locality. Trelissic Basin ; White Eock Eiver, and many 

 other places. 



Distinguished from N. darwinii by the short spire, the 

 gibbous body whorl, and the covered umbilicus. 



Cerithium nodosum. 



Cerithium nodulosum, Hutton, " Cat. Tertiary Moll, of N.Z.," p. 12 ; 

 not of Brug. 



BlTTIUM OINCTUM, U. S. 



Distinguished from B. terebelloides by its larger size, by the 

 spire whorls having four, instead of three, spiral ribs, and by 

 the body whorl having 6-8 spiral ribs. 



Locality. Wanganui and Petane. 



