1921] NATURAL SCIENCES OF PHILADELPHIA. 329 



primaries, and nearly all are beaded. The very large series also 

 comprises specimens transitional in sculpture. 



It is much smaller than C. hay tensis, the maximum size seen hsiving 

 a length of 48.5, diam. 28.5 mm. 



There is a different Conus symmetriciis of Deshayes, Descr. Anim. 

 s. Vert. Bassin Paris iii, 1866, p. 426, pi. 100, figs. 27, 28. 



C. s. var. setniohsoletus Maury is not separable from synmietriciis, 

 being merely the mature stage. This is demonstrated by the very 

 large series in the Gabb collection. 



Conus aratus Gabb. Plate XX, fig. 4. 



Conus araius Gabb, Tr. Amer. Philos. Soc. xv, 1873, p. 232,. 

 Conus ornalus Gabb, Maury, Bull. Amer. Pal. v, p. 41. 



This species resembles C. haytensis somewhat in form, but differs 

 by having conspicuous, widely spaced spiral grooves on the lower 

 two-thirds of the last whorl. These grooves are very sharply cut 

 in half-grown shells; in the largest example some of them are a little 

 less deeply cut. There are about 12 widely spaced grooves and an 

 equal number of close ones near the anterior end. The spire has 

 close and rather deep spiral striae, 4 or 5 on each whorl. The inner 

 whorls are inconspicuously tuberculate above the suture. The 

 growth-lines retract strongly at the shoulder, as in C. stenostoma, 

 which is allied. 



Length 63, diam. 34 mm. Type. 



Length 38, diam. 23.5 mm. Immature. 



Type and 7 others are no. 2572 A. N. S. P. 



C. ornatus Gabb of Maury is the half grown stage of C. aratus. 



Conus planiliratus Sowerby. Plate XX, figs. 6, 9, 



Conus -planiliratus Sowerby, Q. J. Geol. Soc. vi, 1849, p. 44. Guppy, Q. .J. 



Geol. Soc, xxii, 1866, p. 287, pi. 16, fig. 7. 

 Conus regularis Sby., Gabb. Journ. A. N. S. Phila., viii, p. 359, pi. 46, figs. 



45-48. Not of "Sowerby. 



Gabb misunderstood this species. What he called C. planiliratus 

 is an undescribed species which will be called C. perlepidus. 



C. planiliratus is an extremely variable shell in sculpture of the 

 last whorl, but the shape and the sculpture of the spire are quite 

 constant. In large specimens the spirals are weak on the upper 

 half of the last whorl (fig. 9), 



Length 42, diam. 21 mm. or smaller. 



We agree with Guppy 's determination of this species. He has 

 figured a Jamaican specimen. 



For Co7ius planiliratus G. B. Sowerby, Jr., Proc. Zool. Soc. Lond. 



