386 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



show no trace of attached objects, but several preceding whorls have 

 little pits or facets where bits of shell or pebbles were no doubt at- 

 tached, as in the recent X. indica (Gm.), though the agglutinating 

 stage was shorter, not lasting beyond the size of about 8 mm. diam- 

 eter. The base is nearly smooth, having growth-lines only. The 

 narrow umbilicus is more than half covered by the dilated colu- 

 mellar lip. There is no spiral welt near the periphery, as in the recent 

 X. caribaea (Petit), which also has a wider umbihcus and carries 

 more load. 



Alt. 30, diam. 72 mm. 



Type is no. 3221 A. N. S. P. 



NATICIDAE. 



Natica sulcata (Born) 



Naiica sulcata Born, Gabb, Tr. Am. Philos. Soc, xv, p. 223. 



Nearly all of the numerous examples lack the spirals of typical 

 N. sulcata, being the form called rugosa (Gmel.). 



Natica canrena (L.) 



Natica canrena Linn., Gabb, Tr. Amer. Philos. Soc, xv, p. 223. 



The specimens agree fully with recent shells, but they are without 



opercula. 



Natica youngi Maury (finilima Pils. and Johns. Plate XXXIV, fig. 21). 



Proc. A. N. S. Phila., 1917, p. 173. 



This appears to be identical with the prior A^. youngi Maury. 



Polinices mamillaris (Lam.) 



Mammilla mamillaris Lam., Gabb, Tr. Amer. Philos. Soc, xv, p. 223. 

 Natica subclausa Sowerby, Q. Journ. Geol. Soc, vi, p. 51. 



This species was taken in abundance. 



Amauropsis guppyi (Gabb) Plate XXXIV, figs. 25, 26, 27. 



Amaura guppyi Gabb, Tr. Amer. Philos. Soc, xv, 1873, p. 224. 

 ? Natica phasianelloides D'Orb., Guppy, Q. J. Geol. Soc, xxii, 1866, p. 291, 

 pi. 17, fig. 1. 



This graceful shell varies in length of the spire, as the figures show. 

 The type measures, length 32.3, diam. 21.5 mm., and has 8 whorls, 

 the apex not quite perfect, having lost one whorl perhaps. Others 

 are larger, 37.4 mm. long, with 5^ whorls remaining. 



The type and numerous other specimens are no. 2881 A. N. S. P. 



Amauropsis ocalana Dall" has been reported from the Rio Anima, 



" Proc U. S. Nat. Mus., li, 1916, p. .519, pi. 88, fig. 11. 



