niYLOGENY OF FUSUS AND ITS ALLIES. 45 



this is developed quite early, when its presence is indicated by a strong 

 subsiitural band. 



The coloration of this shell consists chiefly in a "flaming" of a 

 dark brown hue, and this and the strong spinose tubercles, together 

 with the broad spirals, are the chief characteristics of the shell. 



Localities: Loo Choo (Nat. Mus. 1056) ; East Indies (Nat. Mus. 

 7378b) ; Madras (B. S. 222, A. Binney). 



FUSUS LATICOSTATUS Deshayes. 



1S31. Fiisiis laticostatus Deshayes, Magasin de Zool., p. 21, pi. 21 (1830). 

 1847. Fusus laticostatus Reeve, Iconica, pi. VIII, sp. 33a-b. 



This species is generally of a ruder aspect than the preceding. The 

 first five or six whorls are round, round-ribbed and ornamented with 

 simple spirals which uniformly decrease in strength towards the sutures. 

 Between some of the spirals secondary ones appear quite early. In 

 many specimens the early whorls have a subdued bicarinate aspect 

 from the increase in strength of the spiral below the central one. This 

 finally subsides, and the whorls become unicarinate. At the same time 

 intercalation becomes compound through the separation on each side 

 of the main spirals of fine spiral lines, which later increase in strength. 

 With this the ribs disappear but the tubercles remain. All the spirals 

 become very broad, especially those on the shoulder and the principal 

 body spirals. The secondary spirals also become broader than in any 

 other species of the genus. 



A number of specimens in the collection of the Philadelphia Acad- 

 emy of Sciences have the round-whorled stage represented by whorls 

 which resemble those of F. reeveanus Phil, rather than F. tnrriculns. 

 They are closely coiled, and the ribs are broad and separated by a mere 

 depressed line. After six or seven of the round wdiorls the angulation 

 appears and the ribs become obsolete except on the periphery, where 

 they are continued in the tubercles. The spirals increase in thickness 

 mainly through the combination of the secondary ones which arise 

 on the sides of the primary ones. 



These specimens may simply represent a variety developed under 

 other than normal surroundings for the species, and arc probably not 

 directly related to F. recveanits. 



Localities: Indian Ocean (15. S. 263); Ceylon (M. C. Z. S79) ; 

 Philippines (Acad. Sci.) ; no loc. (M. C. Z. 31. 881. B. S. : Acad. Sci.) ; 

 Ceylon (Am. Mus. 8006; 8007). 



The relations of the species of this scries appear to be as follows: 



F. nicobaiicus. F. laticostatus. 



F. beckii. 



F. oblitus. 

 F. tubcrculatus. 



