Costa Rico Mioc:enk— Olsson 



i3i: 



Costa Rica, but with a larger and broader body- whorl, and a 

 shorter, more conic spire. The porterior portion of the inner 

 and outer lips are heavily calloused, a feature not developed in 

 S. sincola. 



Gaiun Stage: Water Cay, 



Genus IVfUREX Linnaeus 



Murex messorius Sowerby 



Murex messorius Sowerby, 1840, Proc. Zool. Soc. London, p. 137, 

 Murex recurvirostris Gabb, 1873, Trans. Amer. Phil. Soc, vol. 15, p. 



201. Not M. recurvirostris Broderip. 

 Murex messorius Brown and Pilsbr}^, 191 1, Proc. Acad. Nat, Sci. Phila. 



vol. 63, p. 353. 



Murex messorius Maury, 1917, Bull. Amer. Pal., vol. 5, p. 265, pi. i6, 

 figs. I, 2. 



This is the common Murex in Costa Rica. It is generally 

 small, seldom exceeding 40 mm in height. Each whorl carries 

 three primary varices, between which are 3 or 4 smaller ribs or 

 costse. It is a recent species in the West Indies. 



Gatmi Stage: Gat an, C. Z. 



Water Cay, Paiiama. 

 Zo7ie 5, Red Cliff Creek. 

 Coll. 7, Pumbri Creek. 

 Banana River. 



Subgenus PHYLLONOTUS Swainson 

 !V!urex cornurectus Guppy 



Murex [Chicoreus] megacerus Gabb, 1873, Trans. Amer, Phil. Soc. , 



vol. 15, p. 202. Not M. megacerus Sowerby. 

 Murex cornurectus Guppy, 1876, Quart. Journ. Soc. London, vol. 32, 



p. 521, pi. 28, fig. 4. 

 Mmex [Phyllonotus] cornurectus Maury, 1917, Bull. Amer. Pal., vol. 



5, p. 267, pi. 16, figs. 9, 10. 



