BALL: MOLLUSCA AND BRACHIOPODA. 317 



The nucleus is extremely minute in E. ferminianum, and the very earliest whorls 

 show the sculpture normal except that the peripheral thread cariuates the whorl. 

 It is probable that Scala mitchelli Dull, of the Texas coast, forms a third member 

 of the subgenus. It resembles the present form a good deal, but is much stouter 

 and larprer. 



Epitonium (Sthenorhytis) turbinum Dall, n. sp. 



Plate 9, llgures 5, 6, 8. 



Specimen decollate, as figured, but sliowiug tlie specific characteristics suffi- 

 ciently well ; form deprcsscd-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; pcritreme 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 4S°.6 F. U. S. N. Mus. 110,568. 



This is the most depressed sjiecies 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 witli proportionate rapidity to tliat of the portion figured. 

 Its nearest relation, so far as known, is the S. stearnsii Dall, of the Pliocene of 

 San Diego, California, but this is considerably more elevated than the Galapagos 

 species. 



Gymnoglossa. 



Eulimidae, 



STILIFER Brodekip. 



Stilifer (Mucronalia) sp. ind. ' 



Mucronalia ? Ilartlaub, Bull. Mus. Comp. ZoiJl., 1896, 28, p. 14(5, pi. 4, fip. 25. 



On a species of Bathymetra, dredged by the U. S. S. "Albatross," at station 

 33S1, oil Malpclo 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, be 

 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- 

 meu has not yet been submitted to the writer, and the figure is insufficient to 



