NO. 1237. SYNOPSIS OF THE LUCINACEA—DALL. 811' 



excavation. The 3^oung is Zueina excavata Carpenter, 1857, not of 

 d'Orbigny, 1851, but not the excavata of most west coast collections. 



PHACOIDES (HERE) MAZATLANICUS Carpenter, 1857. 



Mazatlan. 



Carpenter's specimens are so small that it is difficult to be certain 

 about them, but they appear to be a distinct species, allied to the 

 Atlantic P. somhret'en.sls. The}" are distinguished from young apjprox- 

 imatuH by their dense concentric lamellation. 



PHACOIDES (CAVILUCINA' LAMPRUS Dall, 1901. 



Gulf of California. 



This varies from white to orange color, is concentrically filose, and 

 often has the teeth quite distinct. It is LuciiM excwmita of most of 

 the Pacific coast collections, ])ut not of Carpenter, 1857, or of d'Orbigny, 

 1851. 



PHACOIDES (CAVILUCINA) LINGUALIS Carpenter, 1864. 



? Monterey, California. Gulf of California to Acapulco, Mexico. 



The Pacific analogue of the Atlantic P. t'i'hulcatu>< Conrad. Valves 

 were collected at Monterey by Gab)), but they were probably adven- 

 titious, as no other collector has found the species north of the Gulf. 



PHACOIDES (CAVILUCINA) PROLONGATUS Carpenter, 1857. 



Cape St. Lucas. 



A miniature of the preceding, with exaggerated o])liquit3\ It 

 appears to be rare, and I have seen only worn valves. 



PHACOIDES (PLEUROLUCINA) UNDATUS Carpenter, 1865. 



Gulf of California. 



This is Lucina undata Carpenter, 1865, but not of Lamarck, 1818. 

 Since Lamarck's species had been transferred to Luci naps Is (= 2JJyKia) 

 before the publication of Carpenter's name, the latter need not lie 

 rejected. 



PHACOIDES (LUCINISCA) FENESTRATUS Hinds, 1844. 



Lower California to Panama (and Tuml)ez, Peru?), in 10 to 30 

 fathoms. 



The finest and largest species of the subgenus, in occasional individ- 

 uals of which a dwarf anterior right cardinal is perceptible. A young- 

 valve, probal)ly of this species, was referred to Lucina niuricata by 

 Carpenter in the Mazatlan Catalogue, but the latter is not known from 

 the Pacific Coast. Lucina ocliracea Reeve, 1850, should be compared 

 with this species. 



