1921] 



NATURAL SCIENCES OF PHILADELPHIA. 



395 



type, which has lost about one-fourth of a whorl. 



Strombiformis prselubrica Pils. and Johns. Plate XXXV, flg. 10. 



Proc. A. N. 8. Phila., 1917, p. 183. 



Strombiformis ischnon Pils. and Johns. Plate XXXV, flg. 8. 



Proc. A. N. S. Phila.,1917, p. 183. 



Fig. 30. 



Niso minuta. 



Fig. 31. 

 Strombiformis stim ulus. 



Strombiformis stimulus Pils. and Johns. Text-flg. 31. 



Proc. A. N. S. Phila., 1917, p. 183. 



This minute shell is not a Suhularia, as it lacks the axial keel near 

 the base and is not noticeably flattened dorso-ventrally. 



TURBINIDAE. 



Turbo dominicensis Gabta. Plate XLIJ, figs. 16, 17. 



Turbo do minicensis Gabb, Tr. Amer. Philos. Soc, xv, 1873, p. 242. 



Seven specimens are all imperfect, but the species is well char- 

 acterized. There is a conspicuous, beaded spiral cord below the 

 suture, followed by five minor beaded spirals, alternately smaller 

 and larger; then another prominent cord followed by three minor 

 spirals the middle one larger. At the periphery there is a third 

 larger cord, and below it about 9 spirals, those on the base subequal, 

 and all cut into beads by axial grooves. Around the axial region 

 there is a broad and conspicuous callus. The shell was unusually 

 thin for a Turbo. The specimen selected as type (fig. 16) consists 



