ORTMANN : TERTIARY INVERTEBRATES. 221 



Fam. FUSIDsE 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 yth 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); 

 i 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. 



