44 PHYLOGENY OF FUSUS AND ITS ALLIES. 



This specimen corresponds so well with Reeve's figure 34b that it 

 might ahiiost be considered the figured specimen. The early whorls 

 are round and rest upon each other, so as to produce a long and slender 

 spire. The ribs are round and about their own distance apart. Inter- 

 calated spirals appear in the round whorls. The angulation of the 

 tuberculatiis stage appears early and Cjuickly becomes prominent. The 

 shoulder becomes strongly concave and reaches up onto the preceding 

 whorl, thus producing a strong posterior canal. The principal spirals 

 are reenforced by secondary ones, which appear on their sides. They 

 become thicker and merge together, thus producing broad band-like 

 spirals. The last whorl is ventricose and irregular, the nodes are still 

 visible on the keel, and the lines of growth are irregular and strongly 

 marked. The inner lip is separated from the columella and a strong 

 posterior sinus is formed. 



This shell has all the aspect of a F. fiibcrculatiis, in which the spirals 

 have become thickened. The canal has also become somewhat dis- 

 torted. 



Locality: Philippines (Acad. Sci., Dr. T. B. Wilson coll.). 



FUSUS OBLITUS Reeve. 



1842? Fusus nicobaricus Kiener (not Lamarck), Iconographie, pi. VI, fig. i. 

 1847. Fusus oblitus Reeve, Iconica, sp. 29. 



No specimens of this species have been seen, but judging from the 

 figures of Kiener and Reeve it appears to be a closely related species 

 either to F. tuberculatiis or to F. bcckii. It lacks the final ventricose 

 whorl of the last species, but has the same angle of spire. The strong 

 coloration readily distinguishes this species from others of the series. 



FUSUS NICOBARICUS Lamarck. 



1788. Miircx Coins Nicobaricus variegatus Chemnitz, Neues Conch. Cabinet, 



vol. II, p. 241, tab. 160, fig. 1523. 

 1822. Fusus nicobaricus Lamarck, Anim. sans Vert., t. VII, p. 123. 

 1847. Fusus nicobaricus Reeve, Iconica, sp. 37. Not F. nicobaricus Kiener, 



Iconographie, pi. VI, fig. i. 



This species is closely related to the two preceding, sharing with 

 them the slender spire and other immature features. As many as six 

 rounded turriculus whorls have been observed, on the later of which, 

 however, the angulation is suggested by the occurrence of two rather 

 strong spirals at the center of the whorl. The angular whorls are like 

 those of F. tubcrculatus (or torciunus) for a time, but with the sup- 

 pression of the ribs the tubercles become stronger than those of F. 

 tubcrculatus. After this the characteristic broad spirals appear which 

 link this she'd with F. bcckii. The nodes also become sharp and project 

 from the keel. The shoulder becomes somewhat concave, and a pro- 

 nounced posterior canal is developed toward the end. Sometimes 



