42 TRANSACTIONS OF THE WAGNER FREE 



remnants of a dark reddish or brownish coloration on the pillar. As the adult 

 may show other differences when obtained, though certainly intimately re- 

 lated to PI. chariessa, I separate the fossil varietally, under the above name. 

 The recent shell is very variable and has many varieties. 



Pleurotomella ? sp. indet. 



Caloosahatchie beds, a fragment, different from any of those above 

 characterized, but insufficient for description. 



Pleurotomella ? sp. indet. 



Caloosahatchie beds; a minute, single specimen somewhat damaged and 

 insufficient for description, but distinct from any of those previously men- 

 tioned and from any of the recent species. It may be a Mangilia or Daphnclla. 



Family CANCELLARIID/E. 



Genus CANOBLLARIA Lamarck. 



Subgenus Cancellaria s. s. 



Cancellaria Conradiana n. s. 



Plate 3, figure 13. 



This shell differs from the common and well-known C. reticulata Linne of 

 the recent fauna of the Gulf of Mexico in the following particulars : It is 

 much more slender: a specimen 38.0 mm. long has a maximum width of 19.0 

 mm. A specimen of C. reticulata 38.0 mm. long has a maximum width of 

 23.0 mm. In C. Conradiana \h^ aperture is half the total length; in C. re. 

 ticulata the aperture is five-eighths as long as the whole shell. The sculpture 

 is essentially the same in both, and passes through the same range of varia- 

 tions. The suture is less marked in the fossil than in the recent shell. In 

 both there is a slender elevated thread on the body, hardly visible at the aper- 

 ture ; there are also two much elevated, revolving plaits on the pillar and the 

 anterior edge of the pillar is sharp and prominent. Except that on the body, 

 these ridges have a tendency to become double-edged by the development of 

 a secondary cord or ridge on their anterior faces. In the fossil, on the aver- 

 age, these folds are less thick and less double than in the recent shell, while 

 the columella and its fasciole are narrower, weaker, and with a smaller umbili- 

 cal chink. 



About forty specimens of the recent shell have been compared with a good 

 series of the fossil, and so far not a single specimen of the recent form has 

 been found among the fossils, though there is some variation as to stoutness, 

 especially among the young shells. The longest specimen of the fossil is 62.0 

 mm. in length, which exceeds in size the largest C. reticulata I have seen. 

 This species is without doubt a near connection of the recent form. 



