PHYLOGENV OF FUSUS AND ITS ALLIES, 5 1 



FUSUS NOV^-HOLLANDIJE Reeve. 

 1847. Fusus iwva-hoJlandicc Reeve, Iconica, sp. 70. 



The protoconch of this species is swollen and of the normal type 

 throughout, with about two third volutions ribbed. 



The conch begins with slightly angulated whorls which are fur- 

 nished on the center with two strong spirals, thus giving the shell 

 from the first a bicarinate aspect. The shoulder is furnished with 

 two strong spirals, between which and the two central spirals are 

 numerous fine intercalated spiral lines. The ribs in some specimens 

 arc at first weak, but subsequently become stronger, causing a sub- 

 spinosity on the angle where they cross the spirals. 



In a specimen from Port Jackson (Nat. Mus. 91743) intercalated 

 spirals do not appear until the fifth whorl. In the sixth whorl a 

 strong slightly convex shoulder occurs, wdiich is ribbed and striate. 

 The lower of the two central spirals is less prominent in this whorl than 

 the upper, and the shell takes on a unicarinate appearance. This 

 unicarination is visible in the two succeeding whorls, though it is less 

 sharp. It also continues into the last whorl. The ribs finally dis- 

 appear, and the last part of the last whorl is characterized by a slight 

 angulation formed by a somewhat stronger central spiral. 



The specimen here described agrees in all determinable characters 

 with Reeve's figure of this species. It W'ill be seen that there is a 

 close similarity between this species and the young of F. dnpctit- 

 thouarsii, especially of the more slender varieties, in w^hich the whorls 

 are less embracing. 



In the collection of the National Museum is a young shell which, 

 with a number of specimens of F. atistralis, is labeled as coming from 

 South Australia. The specimen is identical with the young of F. 

 dupctit-thoiiarsii from the west coast of America, and it is possible 

 that this specimen has been misplaced. If the locality is correct for 

 this specimen, then it must be regarded as the young of F. novcc- 

 hollandice (the only species with bicarinate young found in those 

 waters). The canal of this specimen is strongly flexed, a character 

 of F. dnpctit-thoiiarsii, but probably not characteristic of F. novce- 

 hollandm. 



Two specimens in the Haines collection of the American Museum 

 appear to agree closely with Reeve's figures. The protonch is perfect 

 and normal. Bicarination of the young shell is somewhat obscured 

 by the strength of the spirals on the shoulder. Intercalation begins 

 in the fifth or sixth whorl. An angulation appears toward the end 

 of the volution where the shoulder becomes flat, and the ribs to some 

 extent obsolete. In the nepionic and neanic stages the ribs are broad, 

 and the interspaces mere depressions. In the final whorl the ribs be- 

 come much swollen on the periphery. 



