812 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. , 



PHACOIDES (LUCINISCA) NUTTALLII Conrad, 1837. 



Santa Barbara, Califoniia, to the (lulf of California, in 1(5 to 30 

 fathoms. 



The Pacitic analoo-ue of 7^. ?)aK'<i(I(( Conrad of the Gulf of Mexico, 

 but a larg-er and tiner shell, A variety, centrifugus Dall, has the con- 

 centric sculpture lunir tiu> l)eaks sparser, more elevated and fring-ed 

 with Hat spiiudes, usually worn off; it was dredj^ed in the Gulf in 26 

 fathoms. Owing- to the manner in which the muricate species have 

 IxMMi c()nfus(>d with one another, it is difficult to disentangde their dis- 

 tribution from the literature; ])ut I have seen no authentic specimens 

 of this species from south of the Gulf of California. 



? ? PHACOIDES (LUCINISCA) MURICATA Spengler, 1798. 



"'Tumbez, Peru," Reeve; "" ^ Mazatlan'' Carpenter. 



The synon}^!!}^ of this species will be found in the east coast list. I 

 have never seen an authentically west coast specimen of this shell. It 

 is not found in an}' of the faunal pu])lications on this coast except that 

 of Carpenter, and there, only with doubt, is identified from a minute 

 fragment, less than a tenth of an inch long. Reeve's localities are 

 notoriousl}^ unrelial)le. 1 consider that the presence of this species on 

 the Pacific coast is yet to be demonstrated, but do not feel justified in 

 omitting' all reference to it here. 



PHACOIDES (MILTHA) CHILDRENI Gray, 1825. 



Gulf of California, Cape St. Lucas, Mazatlan. 



This large fiat species is unmistakable; the locality, Brazil, given 

 in the Conchologia Iconica, is erroneous. The type specimen was 

 descril)ed as inequivalve, but the specimens 1 have seen appear to be 

 entirely equivalve. It was first described as a TelUna. 



PHACOIDES (PSEUDOMILTHA) TELLINOIDES Reeve, 1850. 



Magdalena Bay, west coast of Lower California, south to Guaya- 

 quil, in 11 fathoms. 



Very like the M. Jloridava Conrad, but more elegjint, and with a 

 bright yellow periostracum. It seems to have been at first confused 

 by Cari)wit('r with FclanieUa i<ei'iaita^ owing to the fact that Reeve's 

 fij^ure is not \'(n"y characteristic. It was described as a Luciiui. 



PHACOIDES (LUCINOMA) HEROICUS Dall, 1901. 



Ofi' West Mexico, in 1, (»(>.■) fathoms, in latitude 27 2-1' N., Gulf of 

 California. 



One of the finest species of this interesting and characteristic group, 

 nuich larger than n-i^ahonai ns Stearns, and with a rounder outline. 



