COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 81 



often nearly absent, the basal margins seldom contracted or compressed. 



Various criteria have been suggested for separating Pecten hindsii 

 kincaidi from P. hindsii jordani, but a long series of specimens clearly 

 shows the presence of only a single subspecies. 



From Chlamys rubida this subspecies is distinguished by the follow- 

 ing features: smaller size when adult, right valve not becoming dich- 

 otomous until shell attains height of about 30 mm, ribs of left valve 

 smoother and not fasciculate, reticulate sculpture more prominent and 

 covering entire surface of both valves, and coloring always mottled to 

 some degree. 



Geographical range : Gulf of Alaska to Puget Sound. 



Geochronological range: Pliocene, Pleistocene, Recent. 



Bathymetric range: 25 to 60 fathoms. 



Ecological data: Found off rocky shores, often encased in same 

 species of sponge as Chlamys rubida. 



Chlamys patagonica (King) 1831 

 Plate 26 



Pecten Patagonicus King, 1831, p. 337. "Habitat in Freto Magellanico 

 passim." — Sowerby, 1842, p. 54, pi. 13, fig. 60. "Patagonia and 

 the Straits of Magalhaens." — von Martens, 1881, p. 79. — E. A. 

 Smith, 1881, p. 44. "Stations [H.M.S. Alert] 1, 2, 3, 6 and Puerto 

 Bueno, 2-7 fathoms, rocky bottom." 



[? =] Pecten australis Philippi, 1845b, p. 56. "Patria: Insulae Chonos." 

 [Chonos Islands, southern Chile. Von Martens (1881, p. 79) re- 

 marked that this species appears to have been based on juvenile 

 specimens of P. Patagonicus. See Chlamys amandi (Hertlein), 

 this paper.] 



Pecten rufiradiatus Reeve, 1853, sp. 147, pi. 32, fig. 147. "Strait of 

 Magalhaens." 



Pecten patagonicus King. E. A. Smith, 1885, p. 294. "Juv. = Pecten 

 rufiradiatus Reeve . . . ? = Pecten australis Philippi. . . . Station 

 312, South Patagonia [Chile], in 9 fathoms; and Station 315, 

 Falkland Islands, in 12 fathoms."— Dall, 1909, p. 256. "Magellanic 

 Region, north to Chiloe Island and Puerto Montt [Chile]." — 

 Carcelles, 1944, p. 275, pi. 9, fig. 73. Puerto Quequen [Chubut 

 Territory, Argentina], . . . very rare . . .; Santa Cruz [Territoiy, 

 Argentina], Tierra del Fuego, "archipielago magallanico, etc., 

 . . ."—Carcelles, 1950, p. 77, pi. 4, fig. 72. "Patagonia hasta la 

 Region magallanica, por el Pacifico hasta Puerto Montt, Chile, 

 10-150 metres." 



