36 PHYLOGENY OF FUSUS AND ITS ALLIES. 



whorls are normal, and are succeeded by whorls in which the shoulder, 

 though still convex, is but faintly marked by ribs, and is margined by 

 a nodulated keel. In the last whorl the nodules disappear, and the 

 center of the whorl is marked only by a smooth keel. Intercalated 

 spirals appear early. The other specimen is also round-whorled 

 throughout, but the shoulder is not differentiated. On the later 

 whorls the ribs become obsolescent, after which the whorls are only 

 marked by spirals. This specimen represents the longicandiis type of 

 this series. This type is illustrated by Lischke in figure 5 of plate 3, 

 Japanische Meeres-conchilien, pt. II. 



In some cases (Phil. Acad. 621 18) the early whorls of specimens 

 referable to this species are more closely coiled than usual, when they 

 bear a strong resemblance to those of F. distans. There certainly 

 exists an intimate relation between these two species, they being un- 

 doubtedly genetically connected. Both run through the same series 

 of variations, and the same types are distinguishable in each. 



Localities: Japan, Nagami Bay (Nat. Mus. 125894, 123734) ; 

 Yokohama (Nat. Mus. 32341, 36554, 98352, 91752) (Nat. Mus. 

 40650) ; Lagamo Bay (Phil. Acad. 62118) ; no loc. (M. C. Z. 896, 

 920) ; Tatyama (Adams) ; Jedo and Nagasaki, Japan (Lischke). 



4. THE FUSUS DISTANS SERIES. 



The members of this series are found to-day in both East and 



West Indian waters. They are characteristically robust shells, broadly 



turreted, and with strongly embracing whorls. They run through 



the same variations found in other series, and the types of structure so 



characteristically developed in the F. coins series are again found in 



this group. 



FUSUS DISTANS Lamarck. 



(Plate III, figs. 4, 6 and 7.) 

 1822. Fusus distans Lamarck, An. sans, vers., ist ed., t. VII, p. 124. 



1842. Fusus distans Kiener, Iconographie, p. 10, pi. 8, fig. i. 



1843. Fusus distans Lamarck, An. sans. vers. (Desh. ed.), t. IX, p. 445 (with 

 bibliography). 



1847. Fusus distans Reeve, Iconica, sp. 28. 



The protoconch of this species is of the normal fusoid type. No 

 perfect specimen has been seen, but one in which the last stages of the 

 protoconch are shown occurs in the collection of the Philadelphia 

 Academy of Sciences (loc. Philippines). In the last whorl of the 

 protoconch of this specimen occur numerous smooth crowded vertical 

 riblets, and it stops abruptly with a varix. 



The conch begins abruptly with round whorls, which are furnished 

 with round vertical ribs, closely crowded, with only a narrow depres- 

 sion between. The ribs are crossed by simple spirals, of which three 



