196 Transactions. — Zooloyy. 



cross-vein margined. Axillary cell entirely brown. Costa 

 tawny ; the veins black, but tawny at their bases. No bristles 

 on the costa. Auxiliary vein completely joined to the first 

 longitudinal; the first basal cell short. Distance between the 

 cross-veins about three times the length of the posterior 

 cross-vein. The posterior cross-vein distant about its own 

 length from the margin. Membrane of the wing pubescent. 

 Length, 2-i-mni. ; wing, 3 mm. 

 Hab. Christchurch (F. W. H.). 



Abt. XVII. — On a Neiv Fossil Pecten from the Chatham 



Islands. 



By Captain F. W. Hutton, F.R.S. 



[Read before the Philosophical Institute of Canterbury, 6th November, 



1901.] 



Plate VIII. 



This fine Pecten was brought from the Chatham Islands bv 

 Professor A. Dendy, and was given to me to describe. 



Pecten dendyi, sp. nov. 



Shell equivalve, compressed, inequilateral, the posterior end 

 produced. Ears rather unequal ; the anterior larger, with five 

 ribs, the posterior with two ribs. Byssal notch almost obso- 

 lete. Valves plicated, eight ridges on the left and nine on the 

 right valve. Ridges narrower than the sinuses on the left 

 valve, broader than the sinuses on the right valve. The 

 whole surface, both ridges and sinuses, covered with fine 

 radiating ribs, crossed by delicate growth-lines, which are 

 almost obsolete on the right valve. Length, 2 - 6 in. ; height, 

 2 - 3 in. ; greatest thickness, 07 in. 



Locality. — In a calcareous sandstone, Chatham Island. 



This species differs from P. bumetti in being larger, 

 inequilateral, more compressed, and in having more than 

 seven folds. It is probably of Miocene age. The type is in 

 the Canterbury Museum. 



