NEW SPECIES OF MARINE MOLLUSCA 

 FROM NEW ZEALAND 



By A. W. B. Powell 



Auckland Museum 

 (Plates XLV-LVI) 



INTRODUCTORY NOTE 



The material described in this paper was dredged by the R.R.S. 'Discovery II', 

 during a visit to New Zealand in August 1932. 



As the usual routine of plankton stations was not required in New Zealand coastal 

 waters, the opportunity was taken to repeat some of the bottom stations made off the 

 extreme north of New Zealand by the Terra Nova Expedition of 19 10. 



The writer gratefully acknowledges the invitation given him by the late Commander 

 W. M. Carey and Mr Dilwyn John to join the ship on the coastal cruise from Auckland 

 to Wellington, via the Three Kings Islands and the west coast, and also their willingness 

 to undertake an extension of the work by dredging in several additional localities sug- 

 gested by the writer. The writer is also indebted to the Discovery Committee for 

 granting him the privilege of reporting on the molluscan material dredged on this 

 occasion. 



For assistance rendered in the tedious work of sorting microscopic specimens from 

 the dredgings, the writer records his thanks to Mrs Powell, Mr W. K. Hounsell and 

 Mr A. G. Stevenson. 



The holotypes of all the species herein described, and in most cases a representative 

 series of paratypes of each species, are to be deposited in the British Museum of Natural 

 History, London. Many of the new species occur in abundance, and specimens of these 

 will be retained for the Auckland Museum collection. 



In spite of the fact that dredging was done in the vicinity of the Three Kings Islands 

 by the ' Terra Nova' in 1910, the collections of the ' Discovery II ' contain a large num- 

 ber of new species. Included are six new genera and 128 new species, and thirteen 

 genera not previously known from New Zealand waters. The large percentage of new 

 species obtained from the Discovery II dredgings is due to the efficiency of the conical 

 dredge, as it brings up a fair sample and does not allow of any appreciable sieving of 

 the fine materials on the way to the surface. 



