PIIYLOGENY OF FUSUS AND ITS ALLIES, 



of the protoconch are generally smooth, the apical one minute, gradually 

 increasing in size. The three to four whorls which constitute the 

 apical series form a rather narrow cone. Third whorl with fine 

 closely crowded, more or less oblique riblets, which in part are gently 

 concave forward. These, after the completion of the third, or some- 

 times an additional whorl, quickly merge into the normal whorls of 

 the conch. A basal carina usually marks the ribbed whorls of the 

 apical series, this carina appearing just above the suture. Whorls of 

 the conch as in Fnsiis. 



Type: Fitsiis nicycri Aldrich (=F. ottonis Aldrich). 



FALSIFUSUS MEYERI (Aldrich). 



(Plate XVII, fig. 9.) 

 1886. Fiisus meyeri Aldrich, Bull. I Geol. Surv. Alabama, p. 21, pi. 3, fig. 12. 



1896. Fusus meyeri van Harris, Bull. Am. Pal., vol. I, p. 201, pi. 18, fig. 12 (see 



fig. 5). 



1897. fusus ottonis Aldrich, Bull. Am. Pal., vol. II, p. 172. 



1899. Fusus ottonis Harris, Bull. Am. Pal., vol. Ill, p. 42, pi. 5, fig. 5 (see fig. 4). 



(Since the present species is not a Fusus and Bunker's Fusus meyeri 

 is, the original name may be retained and Fusus 

 ottonis becomes a synonym for Falsifusus meyeri.) 



The protoconch of this species is at first minute, 

 but gradually and uniformly increases in size, the 

 form being pyramidal. The first two whorls are 

 smooth ; the succeeding ones ornamented with strong 

 sharply marked distant sublunate riblets, which are 

 concave forward and at the same time gently slope 

 forward. Just above the suture is a well-marked 

 basal carina. The fourth whorl is somewhat more 

 bulging than the preceding. No sharp line of de- 

 markation occurs between this whorl and that bear- 

 ing the normal ornamentation of the conch. The 

 spirals appear abruptly, and with their appearance 

 the whorls become angular. Above the central 

 carinated spiral on the flattened shoulder occur 

 three fainter subequal and subequidistant ones. A 

 fourth appears next to the suture, on the sixth whorl 

 from that on which the spirals first appeared, or the 

 tenth from the apex. This spiral remains small 

 and close to the suture. Below the central carina, 

 two spirals of the body of the shell are shown. The 

 second of these is just above the suture of the suc- 

 ceeding whorl, and is often somewhat strengthened, suggesting the 

 double carination characteristic of many species of Let'ifiisus. A 

 rather wide space separates this spiral from those below, which 



"fel" 



Fig. 4. Falsifusus 

 meyeri Lignitic 

 type. (After Har- 

 ris.) 



