1921] NATURAL SCIENCES OF PHILADELPHIA. 369 



ed within the last swelling. The whorls of the spire show low, round- 

 ed varices, two or three on each after the first three or four. This 

 specimen is 30.2 mm. long with 9 whorls and a small part of the 

 tenth above. 



Dall's figure of a fragment of the spire shows a somewhat greater 

 apical angle than either of Gabb's specimens. 



Orthaulax inornatus altilis n. subsp. PI. XXX, figs. 16, 17, 18. 



Four of Gabb's specimens differ from the above by the shorter 

 spire. Possibty they intergrade with the typical form, as this is 

 not a character of much constancy in Strombidae ; but in the ab- 

 sence of evidence on this point it may be well to notice this form. 

 PI. XXX, figs. 17, 18 represent the largest example. The apex is 

 wholly covered. There is a longitudinal callous hump on the left 

 side opposite the aperture; but as the lip is broken back the hump 

 appears to be dorsal. There are faint traces of a few spirals towards 

 the base. 



Length 52, diam., 28 mm., antero-posterior diam. 29.5 mm. 



A young example of 9 whorls, 27.5 mm. long. (Plate XXX, fig. 

 16), is similar to the young shell described under 0. inornatus ex- 

 cept that the spire is shorter, with fewer varices on the whorls. The 

 last whorl is wider and has not begun to ascend, The lower half 

 of the last whorl has numerous (about 17) spiral grooves defining 

 rather flattened cords. 



Type no. 4065 A. N. S. P. 



TRIPHORIDAE. 



Triphora mgrocincta C. B. Adams. (?). 



Triphoris nigrocinctus? Adams, Gabb, Trans. Amer. Philos. Soc, xv, p. 239. 



We can add nothing to Gabb 's note on the single young specimen 

 of this form. It at least indicates a species of the perversa group and 

 is probably identical with Triforis calypsonis Maury. 



CERITHIIDAE. 



Cerithium microlineatum Gabb. Plate XXXII, figs. 2, 3. 



C. microlineatum Gabb, Tr. Am. Philos. Soc, xv, 1873, p. 236. 



The upper whorls show small irregular axial folds. The later ones 

 have a series of low nodes below the suture and fine unequal spirals, 

 part thread-like, part wider, the principal ones granulose. The 

 last whorl has one low, broad varix, the earlier ones rather numerous 

 varices at irregular intervals. 



