r H E 

 JOURNAL OF MALACOLOGY. 



No. 4. December 30TH, 1905. Vol. XII. 



SUPPLEMENT TO THE REVISION OF THE NEW 

 ZEALAND POLYPLACOPHORA, 

 WITH DESCRIPTIONS OF NEW SPECIES, n 



By henry SUTER. 



(Plate i.\.) 



Calloehiton empleurus, Button, sp. 



PI. i\, figs. I — 4. 



Shell small, elongated oval, subcarinated, slopes very slightly convex, 

 flesh-colour, with a sciuarish white patch on the posterior part of the jugal 

 tract. Anterior valve (fig. i) almost smooth, but minutely punctate; 

 anterior margin with square white spots at irregular distances, and faint 

 traces of radiate riblets. . Posterior margin with a median notch. Inter- 

 mediate valves (fig. 2). Central area minutely punctate, the jugum mostly 

 smooth, with a few transverse shallow furrows ; the pleural tracts with 9 — 10 

 deep pits on each side in front of the anterior edge of the lateral areas ; 

 these short pits l)ecome shorter and shallower towards the median part 

 of the valve. Lateral areas raised, distinct, with well pronounced concentric 

 ridges. Posterior valve (fig. 3) rather indistinctly minutely punctate, 

 with a subcentral mucro, posterior slope slightly concave. Girdle (fig. 4) 

 with characteristic minute, elongated and imbricating glossy scales. 

 Colour of valves fleshy, lighter and with white streaks on the jugum. A 

 white sipiarish s[)ot on eacli intermetliate vah'e on the posterior part of the 

 jugum, and on the tail valve in front of the mucro. Interior pink, with the 

 sutural laminae white. Sinus rather broad, shallow. Intermediate valves 

 with 3 slits on each side. 



Length 22, breadth 9 millim ; divergence 83°. 



Hah. —Nea.r Stewart Island in about 15 fath. 



Type in the Colonial Museum, \\'ellington. 



A specimen was found on oysters dredged near Stewart Island by Mr. 

 C. Cooi)er, of Auckland, who most kindly ppscnted it to me. Tliis speci- 

 men, ])artly rolled up, was used for giving some further information on this 

 apparently rare species. As I did not want to disarticulate the only speci- 

 men, llir number of .slits in the Irrminal valves still remain unknown. I'he 

 habitat of this species was hitherto unknown. 



(*) Vide : Proc. Malac. Soc. Lond., 1897, vol. ii, p. 183. 



JoURN. OK Mai.ac, 1905, vol. xii. No. 4. 



