No.i2n. svxoi'sis OF xoirrir AMi:i:icAX cardiid.k—dali.. 389 



WEST AMERICAN SPECIES. 



Cardium (Trachycardium) quadragenarium Conrad. L83T. 



Range: Santa Barbara, California, to Todos Santos W-ax. Ix)W(>r 

 California, in 2-i to 60 fathoms. 



Tiiis is Cardium lateolahrHiit Gould, 1851; '+ Cardium ,ravthochei- 

 I'lin (Gould MS.) Carpenter, 1856; + Cardium arenahim, Carpenter 

 {f'sta jur.), 1857; + Cardium kHoku m/Tvyon, 1872, not Redfield. 181-6. 



Shells from deep water are remarkably tine and among tiie largest 

 of the genus. The number of ril)s ranges from 42 to 1-4 and in a 

 remarkable oval variety, mueh more oblique than the typieal form, to 

 4ti. It may be noted that nearly all Cardia have an oval and a more 

 rotund variety, possibly to be correlated with sex. 

 Cardium (Trachycardium) consors Sowerby, 1833. 



Range: (iulf of California south to the Galapagos Islands. 



A fine and well-known shell. A variety lagrum Dall has the iml)ri- 

 cations twice as distant as usual and more elongated. The specimens 

 seen were from the Gulf of California and were all of a color decidedly 

 lighter than the type. The ribs vary from 31 to 34. 

 Cardium (Trachycardium) maculosum Wood, 1815. 



Range: Panamic region; St. Elena, Colombia. 



This is Cardium imdtistriatum Sowerby, 1833, and perhaps also 

 Ciirdlurn arenlcohnn Reeve, 1845. 

 Cardium (Trachycardium) pristipleura Dall, 1900. 



Range: Gulf of California (La Paz) and west coast of Middle 

 America. 



This is Cardium. maculosum Sowerby, 1833, not Wood, 1815; + Car- 

 dl uminacxdatum Reeve, 1844, not Gmelin, 1792. The shell has 34 to 

 39 ri])s, laterally imbricate. Cardium lacunosum Reeve, 1845, should 

 be compared with it. 

 Cardium (Trachycardium) senticosum Sower) )y, 1833. 



Range: Gulf of California to Payta, Peru. 



This is Card-luni mnricatuut Menke, not Linna?us; -\r Cardhmx ras- 

 ft'uin Reeve, 1844; +(^) Cardium, llm/i Reeve, \'^\ih\ ^ Cardium luci- 

 noldes Carpenter {testa juv.), 1857. It is the Pacific coast analogue of 

 ('(ii'dlirm murlcafum Linnaeus. 



Cardium (Trachycardium) belcheri Sowerby, 1829. 



Range: Gulf of California, in 6 to 24 fathoms. 

 Cardium (Ringicardium) procerum Sowerb}*, 1833. 



Range: Low(>r California, from the vicinity of Cerros Island south 

 to Ecuador, and Payta, Peru. Pleistocene of upper California. 



This is Cardium laticostatwn Sowerby, 1833, and Cardhnu j^ana- 

 mense Sowerby, X^^yi'^ ■\- Cardixmi suhelongatum Valenciennes, 1846, 

 not of Sowerby, lS¥);-\- Cardium rotundatum Carpenter {testa juv.), 

 1857. 



