Park. — Description of a New Species of Pecten. 485 



Art. LIV. — Description of a Neiv Species of Pecten from 



the Oamarn Series. 



By Professor James Park, F.G.S., Director Otago Univer- 

 sity School of Mines. 



[Bead before the Otago Institute, 9th August, 1904.] 



Pseudamussium (Pecten) huttoni. (Plate xi., fig 5a, " Eeise 

 cler ' Novara,' ' Palaontologie, bd. i.) 



1873 : Pecten hochstetteri, Hutton, Cat. Tert. Moll. N.Z., p. 30. 

 1897 : Pseudamussium hochstetteri (?) Zittel ; Harris, Cat. 

 Tert, Moll. Brit. Mus., part i. : p. 323. 



Suborbicular. equivalve, equilateral, thin, compressed; 

 both valves smooth ; ears subequal, obtuse, smooth. 



Dimensions. — Height, 80 mm. ; length, 76 mm. 



Formation. — A characteristic form of the Oamaru series of 

 Miocene or Oligocene age. It ranges from the marine green- 

 sands overlying the Tertiary coal to the summit of the Oamaru 

 stone. It has never been found above or below the Oamaru 

 series. 



Localities. — Winton, Milburn, Clarendon, Caversham, 

 Waitati, Waikouaiti, Hampden, Maheno, Kakanui Biver, 

 Awamoa Creek, Oamaru Creek, Totara, Ngapara, Enfield, 

 Black Point, Duntroon, Marawhenua, Wharekuri, Waihao 

 Forks, Pareora Gorge (lower end). White Bock Biver, Tenga- 

 wai, Kakahu, Castle Bock, Waipara, Mount Brown, Mount 

 Donald, Point Elizabeth, Cape Farewell, West Whanganui, 

 Mokau, Baglan, Aotea, Whangarei, Paparoa, Pahi. 



Remarks. — For the past thirty years this beautiful shell 

 has been known to geologists as Pecten hochstetteri. It is 

 easily distinguished from P. hochstetteri, which is radiately 

 ribbed on the right valve, smooth on the left valve, and in 

 mature specimens does not exceed a height of 56 mm. and a 

 length of 54 mm. 



In plate xi., fig. 5a, a right valve of P. huttoni is figured 

 in error as the smooth valve of P. hochstetteri. It was doubt- 

 less this error which originally led to the confusion with 

 respect to the two species. 



