Hutton. — On the New Zealand Siphonariidse. 143 



This species is closely allied to 8. diemenensis, Quoy and Grainiard, and 

 may prove to be a variety of it ; in which case I would ask Australian 

 conchologists to retain our name, as the more appropriate. Further notes 

 on its anatomy and development will be found in the Annals of Natural 

 History for 1882. 



SiPHONARIA ZEALANDICA. PL XVII., figS. H to M. 



Siphonaria zealandica, Quoy and Gaimard, Voy. Astrolabe, Zoologie ii., p. 344, 

 pi. 25, fig. 17-18 (1833). 



Shell ovate-oblong, depressed with numerous rounded ribs, of which 

 about fourteen are usually much larger than the others, two of these close 

 together form the siphonal groove, and are separated by a considerable 

 space from the other larger ribs. Apex obtuse, submedian. Exterior ash- 

 brown, the ribs sometimes lighter ; interior liver-brown, the apex often 

 yellowish, a narrow marginal line, or often only the tips of the projecting 

 ribs, yellowish. Length -75 ; breadth -6 ; height *15 to -2 inch. 



Dentition, 33to 1 4 Q °~ 1 ~^ to40 . Jaw like that of S. australis. Central tooth 



130 to 140 



narrow, its length three times the breadth at the base. Laterals about 

 thirteen, the cutting-point bidentate, and a small cutting-point on the out- 

 side ; marginals with three cutting-points, the median the largest, and 

 bidentate on the inner marginals, simple and rounded on the outer ones. 



Animal like 8. australis, but the ovotestis is pale yellow. 



Hab. Auckland, Nelson, and Wellington ; comparatively rare and very 

 small at Banks' Peninsula, which is the most southern locality at which I 

 have found it. Chatham Islands (?). 



This species is usually easily recognized from the last by its large pro- 

 jecting ribs, but sometimes the shells cannot be distinguished, and the bi- 

 dentate cutting-points of the teeth is the only reliable character. S. inculta, 

 Gould, is probably the same, but I have not seen the figure. Keeve has 

 identified S. zealandica with 8. sipho, Sowb., found in the Indian Archi- 

 pelago ; perhaps he is right, but until the dentition of S. sipho is known it 

 will be better I think to keep the two separate. 



SiPHONARIA REDIMICULUM. Plate XVII., figS. N. to E. 



Siphonaria redimiculum, Eeeve, Conchologia Iconica, Siphonaria, fig. 24. 



Shell ovate-oblong, depressed, rather thin, with about twenty-five dis- 

 tant undulating ribs ; apex posterior, uncinate, bent to the left ; exterior 

 uniform reddish-brown ; interior dark purple, lighter under the apex. 



Length -8--9 ; breadth -65 ; height -2. 



Dentition, 44 ~~^~ 44 . Jaw arcuate, tapering to each end ; surface covered 

 with minute papilla?. Central tooth very narrow, its length being four times 

 the breadth. Laterals about twenty, the cutting-point bidendate and con- 

 tinued down on each side of the cusp ; interior marginals with two cutting- 



