ORTMANN : TERTIARY INVERTEBRATES. 
221 
Fam. FUSIDAd Tryon. 
Gen. FUSUS Lmck. 
150. Fusus subspiralis spec. nov. 
PI. XXXIII, Fig. 19. 
Shell fusiform, elongated and slender. Eight whorls are preserved, but 
the shell is defective below. Whorls very sharply angulated, suture deep. 
Angulation forming a sharp and simple (not nodulose) carina on the upper 
6 whorls ; on the 7th and 8th whorl there are small, remote, but distinct 
tubercles, not continued as ribs below or above the angulation. Upper 
surface of whorls, above the carina, and lower surface slightly concave, 
receding toward the suture. Surface of shell apparently smooth on the 
upper whorls, but with fine revolving striae on the lowermost whorl in its 
upper as well as in its lower part, continued downward as far as can be 
seen. Striae not much crowded, crossed by very fine and indistinct lines 
of growth. Columella straight, slender, elongate, indicating a long and 
straight canal. 
Height, 31 mm; diameter, 12 mm. 
Remarks: Only one incomplete individual, imbedded in hard, refrac- 
tory matrix — apparently the upper part of a rather large species — is pres- 
ent. Last whorl not preserved, but the elongated columella indicates a 
species of the genus Fusus. 
The number of nodes of the carina cannot be ascertained, since only 
part of the lower volutions is exposed, and this part lacks most of the 
shell. I have, however, no doubt that it is possible to recognize this 
species, if better material should be found. 
Record of specimens: Punta Arenas, horizon II (lower Magellanian); 
1 sp. 
Affinities: F subspiralis resembles F oxytropis Philippi from the 
Navidad beds of Chili (see under F. archimedis), but differs in the larger 
size and much more slender spire ; also the form of the upper whorls is 
different, the carina being situated, in F oxytropis , nearer to the lower 
suture, in F subspiralis , nearer to the upper one, although only very 
slightly above the middle. 
