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TERTIARY FAUNA OF FLORIDA 



1373 



ticulations of the margin coarser than in the P. nassula. It is, of course, the 

 immediate precursor and progenitor of the later form. 



Phaooides (Lucinisca) Nuttallii Conrad. 

 Lucina Nuttallii Conrad, Journ. Acad. Nat. Sci. Phila., vii., p. 255, pi. xx., fig. 2, 1837. 

 Phacoides {Lucinisca) Nuttallii Dall, Synopsis Lucinacea, Proc. U. S. Nat. Mus., xxiii., 



p. 813, 1901. 



Pleistocene of San Diego, California, Dall and Stearns ; recent from Santa 

 Barbara to the Gulf of California. 



This fine species is larger than any of the others mentioned, and in the group 

 to which it belongs is only surpassed by P. fenestratus Hinds of west Mexico, 

 which has not yet been reported in the fossil state. 



Phacoides (Lucinisca) muricatus Spengler. 

 Tellina muricata Spengler, Skrift. Naturf. Selsk., iv., pt. ii., p. 120, No. 62, 1798; Chem- 

 nitz, Conch. Cab., xi., p. 209, pi. cxcix., figs. 1945-6, 1799?; Wood, Gen. Conch., p. 185, 



i8is; Dillwyn, Cat. Rec. Sh., i., p. 98, 1817 (La Guayra). 

 Tellina imbricata Chemnitz, Conch. Cab., xi., p. 207, 1799? (name only). 

 Lucina scabra Lam., An. s. Vert., v., p. 542, 1818 (after Enc. Meth., Vers., ii., pi. cclxxxv., 



figs. 5 a-c) ; Fischer, Journ. de Conchyl., iv., p. 414, 1853 ; Reeve, Conch. Icon., 



Lucina, pi. viii., fig. 45, 1850. 

 Lucina scobinata Recluz, Journ. de Conchyl., iii., p. 252, pi. x., figs. 6, 6', 1852 ; Tryon, 



Proc. Acad. Nat. Sci. Phila. for 1872, p. 87. 

 Not Tellina scabra Chemnitz, op. cit., p. 207; Dillwyn, op. cit., p. 96; Gray, Ann. Phil., 



1825, p. 136; or Wood, Ind. Test., pi. iv., fig. 72, 1828; ^= Lucina jamaicensis Lamarck. 



Although the title-page of the volume of the " Conchylien Cabinet" in 

 which Chemnitz cites Spengler's description is dated 1795, the work cited 

 appeared in 1798; consequently Tryon's reference of this part of volume xi. 

 of Chemnitz's work to the year 1799 seems justified. On the page where Chem- 

 nitz gives a list of the species of Tellina about to be described the denomination 

 of this species is T. imbricata and not muricata, which may be the name Chem- 

 nitz had intended to apply before consulting Spengler's work, or perhaps is 

 merely an error. 



The recent form extends from the Florida Keys throughout the West 

 Indies and the adjacent waters. It is stated by Guppy to be found in the fossil 

 state in the Pliocene of Trinidad, West Indies, and in the Pleistocene of Bar- 

 bados, but I have not been able to compare any specimens with the recent shell. 

 It is easily distinguished from any other species of the group by its profusely 

 spinose radial ribs with very inconspicuous concentric sculpture. 



