DALL: MOLLUSCA AND BRACHIOPODA. 317 
The nucleus is extremely minute in H. ferminianum, and the very earliest whorls 
show the sculpture normal except that the peripheral thread carinates the whorl. 
It is probable that Scala mitchelli Dall, of the Texas coast, forms a third member 
of the subgenus. It resembles the present form a good deal, but is much stouter 
and larger. 
Epitonium (Sthenorhytis) turbinum Da tt, n. sp. 
Plate 9, figures 5, 6, 8. 
Specimen decollate, as figured, but showing the specific characteristics suffi- 
ciently well; form depressed-turbinate, aperture circular, very oblique ; whorls 
coherent, rapidly enlarging, probably four or five originally ; smooth, except for 
incremental lines; last whorl with ten strong, broad, sharp-edged varices of 
triangular section, the posterior portion pressed back upon and concealing the 
suture ; basal disk faintly developed, the varices confluent on the base; umbilicus 
absent; peritreme nearly circular. Height of last whorl, 22; diam. of last whorl, 
28; of aperture exclusive of the varix, 11 mm. 
U.S. S. “ Albatross,” station 4642, four miles S. 41° E. from the east point 
of Hood Island, Galapagos Islands, in 300 fathoms, broken shell, bottom temper- 
ature 48°.6 F. U.S. N. Mus. 110,568. 
This is the most depressed species of this group (regarded by some authors as a 
genus) which has yet been described, as it is almost certain that the spire, when 
perfect, diminishes with proportionate rapidity to that of the portion figured. 
Its nearest relation, so far as known, is the S. stearnsti Dall, of the Pliocene of 
~ San Diego, California, but this is considerably more elevated than the Galapagos 
species. 
Gymnoglossa. 
EHulimidae. 
STILIFER Broperip, 
Stilifer (Mucronalia) sp. ind.} 
Mucronalia? Hartlaub, Bull. Mus. Comp. Zool., 1895, 28, p. 146, pl. 4, fig. 25. 
On a species of Bathymetra, dredged by the U.S. 8S. ‘ Albatross,” at station 
338], off Malpelo Island, Gulf of Panama, in 1772 fathoms, mud, bottom temper- 
ature 37°.2 F. 
In Hartlaub’s account of the crinoids of the ‘‘ Albatross”? above cited, he 
mentions and figures a species, referred by E. von Martens to Mucronalia, para- 
sitic on a species of crinoid, later referred by Clark to Bathymetra. The speci- 
men has not yet been submitted to the writer, and the figure is insufficient to 
