180 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



Length 4. 2 mm. , diameter 1 . 7 mm. A second immature specimen, Cat. 

 No. 23261, U.S.N.M., is in the Stearns collection, also from Monterey, 

 California. 



BITTIUM QUADRIFILATUM INGENS, new subspecies. 



Shell similar to B. (piadrlfilatuin but in every way stronger and 

 larger and of white color. The spiral bands in B. (piadTijilatum do 

 not form strong cusps at their intersections with the axial ribs, but 

 simple nodes, while in the present form these intersections are decid- 

 edly cusped. 



The type. Cat. No. 32213, U.S.N.M., from Monterey, California, 

 has lost its nucleus; the ten remaining turns measure: Length 12.2 mm. ; 

 diameter 4.5 mm. Another specimen, Cat. No. 195159, U.S.N.M., 

 was dredged by the U. S. Fisheries steamer AJlxitross at station 4475, 

 10 miles off Point Pinos Light. California, in 142 to 158 fathoms. 



CERITHIOPSIS COSMIA, new species. 



Shell elongate-conic, variegated with various shades of brown, white, 

 and wax yellow. Nuclear whorls 3i, slender, lending the apex a 

 mucronate appearance. First nuclear whorl smooth, second crossed 

 by feeble axial riblets. The riblets increase considerably in size in 

 the remaining turns, where they are very regularly developed and 

 evenly spaced. They are strongl}^ protractive as they pass from suture 

 to suture, the extremity at the lower suture being considerably in 

 advance of the extremit}' at the summit. In addition to the vertical 

 riblets microscopic crinkly lines appear on the intercostal spaces 

 which intersect the riblets in oblique even curves at right angles. 

 The transition from the nuclear to the post-nuclear sculpture is 

 abrupt, the three chief tuberculate spiral keels being present from 

 the very beginning of the postnuclear turn. On the first four post- 

 nuclear turns the posterior spiral keel is less developed than the rest, 

 but it increases with each succeeding turn and finally becomes the 

 strongest of the three. The tubercles are the earl}- whorls, are almost 

 round and slope abruptl}^, concavely posteriorly and gently well 

 rounded anteriorl3\ On the later whorls they are oblong, with their 

 long axis vertical. Channels separating the spiral keels about as 

 wide as the keels on the early whorls, less so in the later turns, curved 

 by the low, broad, strong, backward slanting axial riblets. The 

 spaces between these ribs and the spiral keels appear as rounded pits. 

 Sutures well impressed. Periphery of the last whorl marked by a 

 strong spiral keel. Base well rounded, marked by three equal and 

 equally spaced spiral keels separated by equally wide and strong chan- 

 nels. The entire surface of the spire and base keels, tubercles, and 

 channels are marked by microscopic lines of growth and spiral stria- 

 tions. Aperture subquadrate, posterior angle obtuse, decidedly chan- 



