-T 



CONCHOLOGICAL MEMORANDA. NO. 4. 



[From the Proceedings of the Boston Society of Natural History, Vol. XIII.] 



Ox A New Species of Pedipes from Tampa Bay, Florida. 

 By Robert E. C. Stearns. 



Pedipes natieoides Stearns. Shell resembling a tiny Natica; 

 imperforate, globose, translucent, pale horn color; spire short, apex 

 obtuse; whorls four to four and a half, slightly flattened above; the 

 upper whorls moderately elevated; body whorl nine tenths the length 

 of the shell ; suture strongly defined ; surface ornamented with fine 

 depressed revolving lines, crossed obliquely and regalarly by sharply 

 developed lines of growth; aperture longitudinal, suboval; the middle 

 portion of the outer lip moderately tuberculately thickened within, 

 aud slightly pressed inwards, giving" a some\yhat angular outline to 

 the upper part of its edge; parietal wall covered 

 with shining callus and furnished internally with a 

 strongly developed ridge or plait, which culminates 

 in a prominent sub-acute tooth, projecting in the 

 line of its obliquity two fifths of the width of the 

 aperture; columella showing two rather obtuse teeth 

 or folds, the upper being the largest, with a sinuous 

 sulcation at their bases, parallel to the outline of the columella, 

 causing, together with the folds, an appearance resembling the thread 

 of a screw, or the plaits in Cancellaria. 

 Long. .11 inch. Lat. .06 inch. 



Hal/itat: Littoral zone, Rocky point, Tampa Bay, western shore 

 of Florida; found with other small species of moUusks upon the un- 

 der side of clumps of "Coon oysters" at low water line. Two speci- 

 mens, living, one adult, the other not quite developed. 



This well mirked species is the first of the genus found upon the 

 eastern side of the Continent, and the fourth thus far detected in 

 North America. 



The late Prof. C. B. Adams obtained a species at Panama, P. an- 

 gulatus, Mr. W. G. Binney described another, P. lirata, from Cape 

 St. Lucas, and Dr. J. G. Cooper a third, P. unisidcata, from San 

 Pedro, California; the species above described is more globose, and 

 more delicate than either of the others. 



For the excellent figure of P. nailcoiJes I am indebted to the 

 kindness of my fx-iend, Mr. E. S. Morte. 



