1913.] NATURAL SCIENCES OF PHILADELPHIA. 613 



Turritella forresti n. sp. Plate XX, figs. 2, 3, 4, 7, 8. 



Shell elongate, slowly tapering, of many whorls, with a raised 

 sculpture of three major spiral ridges, of which the one towards the 

 apex is double and beaded, the next one is at first single, but later 

 becomes double and beaded, while the third is, in the younger stage, 

 not beaded. Between these major revolving spiral ridges are finer 

 revolving spirals, about five between the first and second major 

 spirals, and the same number between the second and third major 

 spirals, with a like number from the third spiral to the suture. These 

 secondary spirals may become knotty and beaded when crossed by 

 the diagonal growth lines, and the doubling of the major spirals 

 comes from one of these minor spirals becoming enlarged on that side 

 of the major spiral towards the apex. The suture becomes depressed 

 by the shell being excavated above the suture or on the basal side of 

 the whorl. A fragment of 14 mm. tapers from 4 mm. to 2 mm. in 

 six Avhorls. A larger fragment tapers from 6 mm. to 4 mm. in a 

 length of 13 mm. 



From Willoughby Bay, collected by Mr. W. R. Forrest, in whose 

 honor the species is named. Antigua limestone, Oligocene. Only 

 small fragments were obtained, but these show the scuplture well 

 and the species will undoubtedly be easily recognizable from these 

 specimens. Types A. N. S. P. Collection, invertebrate fossils. No. 

 1,644. 

 Pecten (Amusium) antiguensis n. sp. Plate XVIII, figs, l, 2, 3, 5. 



Inequivalve, shell orbicular, rather thin, convex; the surface cov- 

 ■ered with a fine concentric sculpture, following the growth lines; 

 with about 13 radial ribs running from the beaks, where they are very 

 pronounced, and, in one valve, apparently disappearing towards the 

 margin, but in the other valve continued as undulations of the shell 

 to the margin. The interior of the shell has radial ribs extending 

 to the margin, where the adjacent pairs of ribs contract and are then 

 seen to be paired, but otherwise seeming to be equally spread as in 

 P. (Amusium) hjonii Gabb, from which this species differs in having 

 a strong concentric sculpture (wanting in P. lyonii), and also in the 

 external radial ribbing being continued for a greater distance from 

 the beak than in Gabb's species. The species is likewise related to 

 P. sol B, and P., but this latter has shorter radial external ribs and the 

 internal ribs are paired. The ears are separated from the rest of 

 the valve by a depression, as is the case in P. sol. Length and 

 iieight about equal — 70-75 mm. 



Hodge's Bay and Wetherill's Bay in the Antigua limestone, with 



