214 'Transactions. — Zoology. 



Hah. Ocean Beach, Dunedin. 



The dentition of this animal differs so much from that of E. lineata, and 

 that of E. Kttorinoides, that I am obliged to make it into a distinct species. 



Cerithidea tricarinata, n. s. 



Shell turreted, strongly longitudinally plicate, and distinctly spirally 

 grooved : colour brown, the interior with lighter spiral bands. Whorls 9, 

 or 10, flattened, with eight strong, rounded, sub-nodulose, longitudinal 

 ribs, which on the body-whorl cover only the posterior half, and below them 

 are three, sub-equidistant, well-marked spiral ridges, with occasionally 

 others on the pillar : spire whorls and posterior half of the body- whorl with 

 three or four spiral grooves. Aperture broadly ovate, with a well-marked 

 posterior canal ; anterior canal very short, the aperture deeply notched at 

 the base. Length '56 ; breadth -2 inch. 



Hob. Katikati, near Tauranga. 



Distinguished from C. bicarinata by its bolder sculpture, fewer plications, 

 and the three ridges at the base of the body-whorl. 



Bittium exilis, Hutton. 



Shell turreted, with faint longitudinal plicse, and distinct spiral ribs: 

 colour dark reddish-brown. Whorls 8, flattened, the suture impressed : 

 spire-whorls with two to four spiral nodular ridges, but on the apical whorls 

 the nodules are absent : body- whorl with two to four nodular ridges, in 

 front of which are about six smooth spiral ridges, making about nine in all ; 

 between the ridges there is usually a raised spiral line : columella nearly 

 straight : aperture oval, without any notch at the anterior end ; canal very 

 short, or obsolete. Length -2 ; breadth -07 inch. 



Hah. Auckland Harbour. 



I give an amended description of this species from specimens sent by 

 Mr. Cheeseman. 



ClNGULA LIMBA'TA, n. S. 



Shell elongately conical, smooth, polished but not iridescent. Whorls 

 5 or 6, flattened : aperture ovate, peristome continuous, not iridescent 

 within. Colour ashy brown, usually with a posterior row of white spots at 

 the suture ; last whorl often with angulated brown and white markings. 

 Operculum unknown. Length -11; breadth -06 inch. 



Hah. Auckland (T. F. Cheeseman). 



Crypta unguiformis, Lamarck. 



Dentition. Central tooth as broad as long, the reflexed portion triangu- 

 lar, concave and slightly dentate on each side, the cutting point minute. 

 First lateral broad, with about nine minute teeth. Second and third laterals 

 similar, curved and slightly denticulate on the outer margin. 



Hah. Dunedin. 



