376 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



seen below the suture, or even very faintly in the intercostal spaces 

 over the whole last whorl, about 6 above the periphery. In the 

 type and most others the ribbed portion shows no spirals. 



Alabina angustior n. sp. Plate XXXV, flg. 3. 



The shell is decidedly narrower, with fewer axial ribs, about 14 on 

 the last whorl. Base with about 6 spiral cords, the lower ones very 

 weak. Otherwise like A. canaliculata. 



Length 3, diam. 1 mm.; 10 whorls. 



Type no. 4062 A. N. S. P. 



LITIOPIDAE. 



Alaba maoensis (Gabb) Plate XXXV. fig. 11. 



Cerithium maoensis Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 239. 



The type has lost the tip of the spire, and the last whorl is broken. 

 The whorls are strongly convex, with sculpture of grooves separating 

 low, convex spirals, about 13 grooves on the penult whorl. There 

 is a broad rounded varix on each whorl. 



Length 10, diam. 4.7 mm.; nearly 9 whorls remaining. 



Type no. 2617 A. N. S. P. 



MODULIDAE. 

 Modulus sp. undet. 



This genus is represented by a young shell 6 mm. in diameter, 

 and a fragment of the spire of another. They differ from M. catenu- 

 latus by wanting the low radial plications of that species. It is 

 evidently close to M. wilcoxi Dall, of the Chipola beds, but there 

 are some differences, and without adult shells a positive identifica- 

 tion cannot well be made. 



VERMETIDAE. 



Serpulorbis papulosus (Guppy) 



Vermetus papulosus Guppy, Q. J. Geol. Soc, xxii, 1866, p. 292, pi. 17, fig. 3. 



Thought by Gabb to be the straight portion of Petaloconchus 



domingensis; but some of the specimens show that the early whorls 



are very irregularly contorted. The straightened part has three 



striae between the rows of pustules, the central one larger. The 



largest tube has a diameter of 10.5 mm. 



Vermetus (Petaloconchus) laddfranklinse (Maury) 



The lower whorls are very irregularly coiled, circular in section. 



