342 PROCEEDINGS OF THE ACADEMY OF [April, 



Couus emulator n. sp. PI. XXIII, flg. 9. 



A cone related to alveatus Conr. and imitator, differing from both in 

 the very concavely conic spire. Whorls slightly concave above, with 

 about 3 spiral strise; not tuberculate, last whorl decidedly convex 

 below the shoulder, its lower half spirally striate, the striae unequal, 

 not beaded. The outer lip is much less retracted above than in 

 alveatus. 



Length 22.5, diam. 12.8 mm.; whorls about 9. 



The single specimen is a pseudomorph in calcite. It differs from 

 C. domingensis by the non- tuberculate early whorls. 



Conus imitator n. sp. PI. XXIII, fig. 4. 



A cone about twice as long as wide, the spire forming about one- 

 fourth of the length. The spire is concave and acuminate in the upper 

 third, the first 3 whorls smooth, the next 4 or 5 whorls having a smooth 

 carina projecting above the suture, the first 2\ of them tuberculate, 

 after which the carina is smooth; following whorls less steeply sloping, 

 very slightly concave, marked with fine growth-lines and a few weak 

 spiral strise, slightly prominent at the sutures. Last whorl acutely 

 carinate, the slope below the angle almost straight, but just perceptibly 

 convex in the upper, concave in the lower half, which is sculptured 

 with about 16 rather strong spiral cords. The outer lip arches 

 strongly forward and is deeply retracted at the upper end. 



Length 35, diam. 17 mm., whorls 12. 



This small, inornate cone is probably a descendant of C. alveatus 

 Conr. of the Vicksburgian, but in that species the spire is more strongly 

 striate, more whorls are tuberculate, and the keel edging the whorls 

 is directed upward, whilst in C. imitator it is rather outward. 



It is rather abundant at Gatun. Also occurs in Santo Domingo. 



Conus gaza Johnson and Pilsbry, n. sp. PI. XXIII, figs. 2, 3. 



"The shell is biconic, diameter over half the length, the spire is 

 nearly one-third the total length, concavely conic, attenuate towards 

 the apex. Post-embryonic whorls about 9, slightly concave, the lower 

 edge of each angular, projecting a little; the angle tuberculate in the 

 first post-embryonic whorl, smooth in the rest; sculptured with deeply 

 arcuate, narrow, low and widely spaced riblets and strise; no spiral 

 strise. Last whorl acutely angular at the shoulder, barely convex 

 below the angle, the outline becoming concave in the lower part; 

 sculptured with 20-22 strong, smooth, flattened spiral cords, separated 

 by wider intervals which are sharply striated by growth-striae. Aper- 

 ture very narrow. 



"Length 24, diam. 13.1 mm." (Johnson and Pilsbry). 



