1921] NATURAL SCIENCES OF PHILADELPHIA. 353 



Murex (Pteropurpura ) textilis Gabb. Plate XXVIII, fig. 4. 



Murex (Pteronotus) IrxtilisGahh, Tr. Am.Philos. Soc.,xv, p. 202. Dall, Trans. 



Wagner Free Inst., iii, p. 142, pi. 9, fig. 4. 

 Murex (Pteropurpura) textilis Dall, t.c. pt. 2, 1892, p. 243. 



This beautiful species is also found in the Pliocene of the Cal- 



oosahatchie River, Florida. It has been well figured by Dr. Dall. 



Length 31, diam. 17 mm. 



Type no. 3257 A. N. S. P. 



Murex recurvirostris Brod. 



Murex recurvirostris Brod., Gabb, Tr. Am. Philos. Soc, xv, p. 201. 

 Murex messorius Sowb., Reeve, Conch. Icon., Murex, fig. 90. 



This is an extremely variable species. In the large series before 

 us from both the West Indies and the west coast of Central Amer- 

 ica and Mexico, we can find no invariable character by which to 

 separate them aside from their geographic distribution. This 

 does not seem ground for specific distinction, for the two have ap- 

 parently existed unchanged since the Oligocene, when the Alantic 

 and the Pacific Oceans were still connected. 



Murex domingensis Sowerby. 



Murex domingensis Sowerby, Q. J. Geol. Soc, vi, 1849, p. 49, pi. 10, fig. 5. 

 This differs from M. recurvirostris in usually having a noticeably 

 higher spire, less spinose and shghtly more elevated varices, with 

 usually four intervariceal folds that are more evenly nodose (not 

 tuberculate) ; the fine spiral lines alternating with the nodose spirals 

 are more prominent, and the anterior canal is apparently shorter. 



Murex yaquensis Maury. 



Murex antillarum Gabb, Tr. Am. Philos. Soc, xv, 1873, p. 202. Not of Hinds. 



While resembling somewhat the extreme form of M. domingensis, 

 this is no doubt specifically distinct. It is a more slender shell, with 

 rounded, convex whorls, narrowly horizontal below the suture, var- 

 ices smaller but more spinose; with six intervariceal costae that are 

 crossed by alternating spiral cords, the larger of which where they 

 pass over the costae form compressed nodes, about twelve to each 

 rib. The smooth embryonic shell consists of two trochoidal whorls 

 that are but slightly convex, and much less oblique than in AI. dom- 

 ingensis. 



Length 42, diam. 23 mm. 



Length 36, diam. 18.4 mm. (Type of M. antillarum Gabb.) 



There was an error in Gabb 's measurements. 



