128 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Section CrREGAKIELLA Monterosato. 



Cfregariella Monterosato, Norn. Con. Medit., p. 11, 1884. — Dall, Trans. 



Wagner Inst., vol. 3, pt. 4, p. 91, 1898. Type, Mytilus petagnae Scacchi. 

 BotuUna Dall, Bull. U. S. Nat. Mus. No. 37, p. 38, 1889. Sole example, 



MocUola opifex 8aj=Mytilus coralliophagus Gmelin, and Modiola semen 



Lamarck. 



MODIOLUS (GREGARIELLA) MINIMUS Dall. 

 Plate 24, fig. 6. 



Modiolus {Gregariella) minimus Dall, Trans. Wagner Inst., vol. 3, pt. 4, 

 p. 797, pi. 35, fig. 26, 1898. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. U. S. 

 Nat. Mus. No. 165185. 



Based on an imperfect but characteristic pseudomorpli. The com- 

 plete external features of this species are still to be discovered. 



. MODIOLUS (GREGARIELLA) cf. OPIFEX Say. 



An internal cast strongly recalling the form of M. opifex Say was 

 obtained by Mr. Post, but is without the surface characters by which 

 its specific identity might be determined. U. S. Nat. Mus. No. 214741. 



Section BOTULA Morch. 



Botula MoRCH, Yoldi Cat., pt. 2, p. 55. 1853 (no type cited). — II. and A 

 Adams, Gen. Rec. Moll., vol. 2, p. 519, 1857. — Fischer, Man. de Conchyl., 

 p. 969, 1886. Type, M. cinnamomeus Lamarck. 



MODIOLUS (BOTULA) CINNAMOMEUS Lamarck. 



Modiola cinnamomea Lamarck, Anlm. s. Vert., vol. 6, p. 114, 1819; ed. 



Deshayes, vol. 7, p. 25, 1835; after Chemnitz, Conchyl. Cab., vol. 8, 



p. 152, pi. 82, fig. 731, 1785. 

 Modiolus (Botula) cinnamomeus Dall, Trans. Wagner Inst., vol. 3, p. 797, 



1898. 



Oligocene of the Tampa silex beds at Ballast Point, of the marl 

 of the Chipola Elver, Calhoun County, Florida, and of the island 

 of Trinidad, West Indies. U. S. Nat. Mus. No. 165186. 



Also in Pliocene marl of the Caloosahatchie beds of Florida, and 

 widely distributed in the warmer waters of the United States and the 

 West Indies in the recent state, usually as a borer in coral or other 

 soft and limy substances. A similar if not identical shell, 31. fuscus 

 Gmelin, has been reported from the Indo-Pacific region. 



Genus LITHOPHAGA Bolten. 



Lithophaga Bolten, Mus. Boltenianum, p. 150, 1798; ed. 2, p. 109, 1819.— 



Morch, Cat. Yoldi, p. 55, 1853. 

 LitJiodomus Cuvier, Regue Anim., vol. 2, p. 471, 1817. 

 Lithophagus Mf^erle, Entwurf., p. 69, 1811. 

 Lithophaga Dall, Trans. Wagner Inst., vol. 3, pt. 4, p. 798, 1898. 



