SYXOFSIS OF THE VKXERID.E—DALL. 395 



prominent white leaflets at (^ach end of the shell. The nepionie young 

 are white, smooth, globular, with one or two sharp distant concentric 

 lamella?. 



CHIONE (LIROPHORA) MARI^ Orbigny, 1847. 



(xulf of California and south to Guayaquil, in 12 to o(» fathoms. 



This analogue of Chione paphia has narrow, high, and recurved 

 concentric ribs, with fine radial wrinkles, obsolete in the interspaces, 

 except near the beaks. The closeness and number of the ribs in the 

 young is quite variable. It is quite distinct from C. papilla. It is 

 the YeniiH cypria Sowerby, 1835, and Chionr- cypria Deshayes, 1853, 

 but not Yen an cypr'ia Brocchi, IHl-t, or Kisso, 1826. Venus diserepaftis 

 Sowerby, 1853. should be compared with this species. 



CHIONE ( LIROPHORA 1 SCHOTTII Ball, 1902. 



Humboldt Bay, Gulf of Panama; Arthur Schott. 



Small, white, with close, flat, subconcentric, low ridges, abruptly 

 attenuated or duplex on the posterior dorsal area; the valves rounded 

 below with high beaks. The sculpture, on a small scale, recalls that 



of Antidnfh eallosa. 



CHIONE (TIMOCLEA) ASPERRIMA Sowerby, 1835. 



Gulf of California, at La Paz, and southward to Payta, Peru. 



This shell is easilv confused with PrototJiaca grata. Say, from which 

 it ma}" be distinguished b}" its more rasplike surface, larger lunule, 

 extremely long anterior cardinal, and more cuneate outline. It is \e\- 

 lowish or olive, sometimes maculated with brown. VeniLS intersecta 

 Sowerby, 1852, is said to be a synonym though the figures look more 

 like C. pecto7')na. The dubious Lamarckian name of cardioides has 

 also been assigned to this species, but this depends chiefly on guess- 

 work. The V. pectuncnlo'ides Valenciennes, 1839, is said to be 

 identical. 



CHIONE (TIMOCLEA) TUMIDA Sowerby, 1852. 



Panama and West Colombia. 



This is distinguished frtmi the preceding by its tumid, squarish form, 

 finer and more delicate sculpture, and longer hinge line. It is not the 

 variety tumida cited by Carpenter for a Californian Protofhaca. 



CHIONE (TIMOCLEA I COLUMBIENSIS Sowerby, 1835. 



Mazatlan to Payta, Peru. 



This is remarkable for the strength of its flat ribs and rounded, 

 Cardiwn-Wki^ outline. It is not th(> Venus domheyi or doinhell of 

 Lamarck, as was supposed by Deshayes, but it shares with that species 

 the peculiarity of having the concentric sculpture absent over the mid- 

 dle part of the disk. It is generally of a dark mottled brownish color 

 externally, and white or with a faint purple flusli internally. 

 Proc. N. M. vol. xxvi— 02 27 



