303 Costa Rico Miockne — OLvSSon 131 



Costa Rica, but with a larger and broader bodi^-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 IViUREX Linnseus 



fslurex messorius Sowerbj^ 



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

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



201. Not iJ/. recurvirostris Broderip. 

 Murex uiessorius Brown and Pilsbry, 191 1, Proc. Acad. Nat. Sci. Phila. 



vol. 63, p. 353. 

 Murex inessorius Maury, 1917, Bull. Amer. Pal., vol. 5, p. 265, pi. 16, 

 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 

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



Gatun Stage: Gatun, C. Z. 



Water Cay, Pana77ia. 

 Zone 5, Red Cliff Creek. 

 Coll. 7, Punibri Creek. 

 Bajiana River. 



Subgenus PHYLLONOTUS Swainson 



Murex cornurectus Guppy 



Murex {Oiicoreus) 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. 

 Muiex {PJiyllonotus) cornurectus Maury, 1917, Bull. Amer. Pal., vol. 



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



