176 ANCISTROSYRINX, DRILLIA. 
synonyms. The latter is probably erroneously assigned to 
Panama, on Cuming’s authority ; itis evidently a young shell, and 
that Reeve should have placed it in Pleurotoma is suggestive. 
Japan. 
Var, SPINICINCTA, von Martens. Fig. 99. 
Chestnut-brown, surface rougher, whorls 9, instead of 7-8, 
spines longer, more numerous, with oblique rows of short spines 
upon the canal. L. 67, diam. (without the spines) 14°5 mill. 
W. Australia. 
Genus ANCISTROSYRINX, Dall, 1881. 
Shell with the posterior surface of the whorls concave, with 
a broad deep sinus, bordered externally by a pectinated elevated 
frill, directed backwards. 
A. ELEGANS, Dall. 
Shell with the canal about the same length as the spire, acutely 
tapering before and behind; white; whorls nine, of which two 
are embryonic; aperture very long and narrow; anterior surface 
of the whorls everywhere sculptured with even uniform spiral 
rows of rounded nodules beautifully reticulated by the lines of 
growth ; one row about the middle of the whorl slightly elevated 
above the others; carina fringed with delicate triangular points ; 
posterior surface of the whorls, except for lines of growth, 
smooth, with one row of nodules just inside the carina; canal 
straight, columella not thickened, but somewhat twisted anteri- 
orly, outer lip sharply angulated by the carina. 
L. 27 mill., of which 12 mill. are behind the carinal notch; 
max. width, 12 mill.; width of aperture, 4 mill. Defl. 45°. 
Florida Reefs (Pourtales) ; off Havana (Agassiz). 
Unfigured. 
Genus DRILLIA, Gray. 
Section BracHysToMA, Swainson. 
A. Alate. 
D. Stromsorpes, Sowerby. PI. 10, fig. 58. 
Shell with a sutural band, and oblique longitudinal ribs below 
the periphery, sculptured by revolving lines, which are some- 
what granular towards the base of the body-whorl; aperture 
