SUTKR : NEW ZEALAND rOLYPLACOrHOEA. 



187 



Central area closely and finely quincuncially granulate, the anteriorly 

 divergent rows predominating. End valves minutely decussate, witli 

 two concentric ridges, whicli are rendered granulose by numerous 

 radiate riblets. Mucro of tail valve central, low, and obtuse, posterior 

 slope slightly concave. Girdle of the same colour as the jugum, 

 covered densely with small imbricating scales, all of about the same 

 size ; they are flatly convex and deeply grooved, 3-4 grooves on each. 

 The margin of girdle beset with a fringe of minute spicules. Interior 

 blue. Anterior valve with 11-13, central 1, posterior 12-13 slits; 

 the teeth are sharp and smooth. The posterior margin of intermediate 

 valves slightly beaked and denticulate ; posterior tooth short, as in 

 lachiochiton longicijmla. Eaves solid. Sinus broad, flat, smooth, 

 channelled on each side on the inner surface of the sutural plates. 

 Length 21, breadth 12 mm.; divergence 120°. 



IscltnochifoH ParJccri, n.sp. 



1. Dorsal view of shell, nat. size. 



2. Posterior view of ceutral valve, nat. size. 



3-5. Anterior, median, and posterior valves, enlarged, 

 6. Portion of girdle, magnified. 



Hah. — Auckland Islands ; Campbell Island. 



Type in the Otago University Museum. Described from s]urit 

 specimens kindly sent me by Professor T. J. Parker, F.R.8., Duncdin, 

 and I have much pleasure in associating his name with the species. 



Specimens from Campbell Island, also in the Otago Museum, are of 

 a light-brown colour, and were mistaken for C. circumvallatus, Reeve. 



This species may be Lepidopleurus melanterus, Rochcb., one of the 

 many insufficiently described species. 



