428 TRANSACTIONS OF THE WAGNER FREE 



one another, and strung on the rib, somewhat like what is called by ladies 

 " herringbone-stitch," except that the cups are symmetrical and not alternate 

 on opposite sides of the rib ; interior smooth ; the foraminal callus sub- 

 triangular, somewhat concave behind; margin of the shell rounded and 

 crenulate. Lon. 27.0; max. diam. 15.75 ; alt. 7.0 mm. 



The nearest approach I know of to the elegant funicular imbrication of 

 this shell, when perfect and well developed, is found on the anterior ribs of 

 young specimens of Cardium floridamim, where similar imbrications occur, 

 but more distantly arranged. The young shells are destitute of the peculiar 

 sculpture, and recall the youngofi^. c/«/^/fl««, though usually more depressed- 

 The funicular sculpture is very delicate, and rarely preserved over the whole 

 of the shell. The figure, necessarily rather reduced in size, gives but an im- 

 perfect idea of the sculpture when magnified. The young show a smooth 

 spiral nucleus of one whorl. 



Fissuridea alternata Say. 



Pliocene of the Croatan beds in North Carolina, the Waccamaw beds, 

 South Carolina, Johnson, and perhaps of the Caloosahatchie, Dall ; Post-Plio- 

 cene of Florida, and living on the coast of the United States from Cape 

 Hatteras southward to the Florida Keys, westward to Texas, through the 

 Antilles, and south to the island of Fernando Noronha, on the eastern coast 

 of Brazil. 



The specimens from Tilly's Lake, South Carolina, are unmistakable; the 

 single young specimen from the Caloosahatchie must be regarded as doubt- 

 fully determined. 



Genus PUNOTURBLLA Lowe. 



I have already called attention to the close approximation of the Claiborn- 

 ian F. tenebrosa Conr. to Puncturella. A genuine species of Punctiirella is 

 reported by Meyer from the Jacksonian under the name of P. Jacksonensis. 

 The specimen figured is so small that some doubt attaches to the generic 

 determination, since the very young of all these Fissurellidce exhibit the 

 Picncturella-iorm until the enlargement of the foramen removes the spiral apex. 

 Some of the deep-water species of Puncturella found living off our coast are 

 found fossil in the Pliocene of Italy. One such species, P. rostrata (belonging 

 to the subgenus Fissiiriseptd) Seguenza, was reported by Dr. Watson in the 

 Challenger Report. On an examination of typical specimens named by 

 Watson, and a comparison of them with fossil Italian specimens named by 

 Professor Seguenza, it was obvious that two species were concerned, and in 

 the Blake Report I named the American recent form P. triangulata. As I 

 was working with the specimens authentically named, I paid no attention to 

 figures, but in citing Watson's name inadvertently cited his figure also, not 

 noticing that it was a copy of Seguenza's, and not taken from one of his own 

 specimens. This oversight on my part, to which Mr. Pilsbry has called atten- 



