No. 2314. 



LIST OF RECENT BRACEIOPODA—DALL. 



351 



Cat. No. 



110801 

 110799 

 110803 

 110804 

 110802 

 204661 

 204664 

 204665 

 204666 

 110847 

 110805 

 107732 



Locality. 



Off Avacha Bay, Kamtchatka, 682 fathoms. 



Japan 



Kagoshima Gulf, 103 fathoms 



Sagami Bay, 369 fathoms 



Japan Sea, 190 fathoms 



Japan Sea, 390 fathoms 



Uraga Straits, 85 fathoms 



Suruga Gulf, 57 fathoms 



Suruga Gulf, 131 fathoms 



Off Honshu Island, 265 fathoms 



Gulf of Tokio, 70 fathoms 



Gulf of Tokio, 169 fathoms 



Collector. 



B.F... 

 Fulton 

 B.F... 

 B. F... 

 B. F... 

 B.F... 

 B.F... 

 B.F... 

 B.F... 

 B.F... 

 B.F... 

 B.F... 



Number 

 of speci- 

 mens. 



15 

 2 

 1 

 1 

 7 

 1 

 2 

 1 V. 

 1 

 1 

 3 

 1 



This species is remarkable for its variations in form. The 

 originally described form was almost bilobate, pinched together 

 in the median line; from this it varies to squarely truncate or even 

 with the truncation prominent anteriorly. From rounded trian- 

 gular it varies to ovate or even nearly circular, but always with 

 the anterior truncation. Some specimens show a feeble "dorsal 

 amplication," others have a marked depression medially in the 

 brachial valve, and the most normal or typical show a pinching 

 together of both valves in the median line with more or less biloba- 

 tion. In the pedicel valve the teeth are strong, with well marked 

 props which have a callous concave area between them, with no 

 median ridge, but two widely separated low ridges which extend 

 two-thirds of the way to the anterior edge of the valve; in the 

 the brachial valve there is a moderate cardinal process, the crural 

 stems are united by a concave platform supported medially by a 

 strong septum separating the cavity below into two parts. The 

 septum in front of the platform is thin, moderately high and extends 

 forward less than one-third the length of the valve, the apex where 

 the cross band of the loop is attached is about 4 millimeters in 

 front of the tips of the crura, in a specimen 40 millimeters long. 

 The color is always brownish. 



LAQUETJS MORSEI Dall. 



Laqueus morsei Dall, Nautilus, vol. 22, No. 3, July, 1908, p. 29. 



Type locality. — Japan Sea in 122 fathoms, stony mud bottom, 

 temperature 34.1° F., at Bureau of Fisheries station 4860. 



