NO. 12&4. ILL USTRA TIONS OF A MERICAN SHELLS— DA LL. 5 3 5 
A subdivision of the old group included under the name of Trop/wn 
was published ^ by De Gregorio. This was hastily done, and several 
of the groups had previously been named, while others are hetero- 
genous. Examples are cited, but no types selected. The scheme is 
as follows: 
Genus Trophon de Gregorio, 1885, = Trophon, Montfort, 1810. 
Subgenus Pinon de Gregorio, 1885, = Boreotrophon Fisc^her, 1884, + Fmus sp. 
+ Coliunhariuia von Martens, 1881. 
SubgenuH Clialition de Gregorio, 1885, = Trophono}>sis Bucquoy, Dautzenlierg, and 
DollfuH, 1882. 
Siil)genus Pirrjofi- de Gregorio, 1885, may stand as a section of Troph(yn<qm>i with 
TropJion alirolafu^ (8()wer])y) Wood, as type. 
Subgenus }npus de Gregorio, 1885, founded on Tr(>i>ho)i giiratu^ Hinds, is probably 
referal)Ie to VoraUiophUa or Latiaxis. 
There a number of other genera which have been proposed which 
are close Ij^ related to Trophon^ but which will not l)e discussed on this 
occasion. 
I need not dwell on some groups proposed by Hutton for Antarctic 
forms which he places under Trophon^ but which appear to me to be 
more properlj^ grouped under genera like Purpura or Ocmehra. A 
few notes on austral American species may be offered here. 
TROPHON CRISPUS Gould. 
FusxL^ crispus Gould, Proc. Boston Soc. Nat. History, III, May, 1849, p. 141; 
Otia Conch., p. 64; Shells of the Wilkes Exploring Expedition, 1852, p. 229, 
pi. xvi,-figs. 279, 279rt, 279c (not fig. 2796). 
Trophon crispus Gould, Otia Conch., p. 245, 1862. 
Orange Harbor, Patagonia, Couthouy. Type, U.S.N.M., 5^77. 
With this as a variety was included the following very distinct 
species: 
TROPHON PELECETUS, new species. 
Fusus crispus var., Gould, Shells of the Wilkes P'.xploring Expedition, 1852, 
p. 229, pi. XVI, fig. 2796. 
This remarkable form, though much smaller than the T. crispus^ has 
one more whorl, being seven, including the nucleus. The spire is very 
acute, the last whorl much the largest, with deeply constricted sutures; 
the whorls tabulate above with nine very strong angular varices, the 
interspaces narrow and deep, the distal edges of the varices thick and 
broad, somewhat crenulate by revolving threads, sometimes obsolete 
between the varices, and on them crossed by prominent incremental 
lines; margin of the aperture callous, but not denticulate; canal slender, 
slightly recurved, and rather long. The color is yellowish white. Lon. 
of shell lo.5; of aperture 9.0; max. lat. of shell 8.0 mm. 
'Bulletin of the SociSta Malac. Italiano, XI, p. 27, August, 1885. 
^ Not Pijrgus, Hilbner, 1816, Lepidoptera. 
