76 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



The typical Purpura has a small projecting spur or tooth, project- 

 ing from the anterior part of the outer lip, and most of the species 

 are shore or shallow-water denizens. But there is a very closely 

 allied group which lives in deeper water and is without the tooth, 

 and has as a rule more delicate shells. For these out of a host of 

 synonyms I selected in 1889, the name Ptero purpura Jousseaume. 



Subgenus PTEKOPURPURA Jousseaume. 



Pteropurpura Jousseaume, Rev. de Zool. for 1879 (1880). Type. Mnrex ma- 

 cropterus Deshayes. — Fischer, Man. de conchyl., p. 641, 1884. — Dall, 

 Trans. Wagner Inst., vol. 3, pt. 2, 1892, p. 242; pt. 5, 1900, p. 1199. 



PURPURA (PTEROPURPURA) POSTI Dall. 



Plate 7, fig. 9. 



Pteropurpura posti Dall, Proc. U. S. Nat. Mus., vol. 18, p. 44, 1895; Trans. 

 Wagner Inst, vol. 3, pt. 5, p. 1199, pi. 43, fig. 7, 1900. 



Tampa silex beds at Ballast Point, Tam23a Bay, Florida ; two speci- 

 mens, E. J. Post. U. S. Nat. Mus., No. 130349. 



The young specimens have an intercalary axial rib between the 

 varices which might be taken for a varix in a hasty examination. 



Genus MURICIDEA (Swainson) Morch. 



Muricidea (part) Swainson, Mai., pp. 67, 296, 1840. — Morch, Yoldi Cat., 

 p. 95, 1852. First species, Murex hexagona Lamarck. 



Swainson's original group was heterogeneous, Muricopsis Bucquoy, 

 Dautzenberg, and Dollfus, 1882, is synonymous. 



MURICIDEA HEILPRINI Cossmann. 



Plate 7, flg. 4. 



Murex spiniilosa Heilprin, Trans. Wagner Inst., vol. 1, p. 108, pi. 15, fig. 



41, 1S87 ; not of Deshayes. 

 Mm-icidea spinulosa Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 149, pi. 8, 



fig. 9, 1890. 

 Muricidea heilprini Cossmann, Essais Pal., vol. 5, p. 34, Dec, 1903. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida; Heil- 

 prin, Post. U. S. Nat. Mus. No. 165089. 



MURICIDEA, sp. indet. 



Muricidea (sp. ind.) Dall, Trans. Wagner Inst., vol. 3, p. 149, 1890. (Cf. 

 M. cristata Broechi). 

 Tampa silex beds at Ballast Point, Tampa Bay, Florida ; Burns. 

 This is evidently a Muricidea but too imperfect to determine spe- 

 cifically. 



