THE NAUTILUS. 



type of the genus, but has a more elevated and slender spire and 

 fewer axial ribs. H. acuminata is a Philippine shell. 



The genus Nassaria of Link was heterogeneous ; no type was 

 named. N. lyratn Gmelin (S. N., 3494, no. 109) is to my mind 

 quite a different thing from the Hindsia of Arthur Adams, based on 

 such species as H. acuminata. The former is a reticulate shell with- 

 out varices, and with an open canal. The latter and its congeners 

 have a strong and prominent terminal varix, a closed canal, when 

 adult, and sculpture more like the Tritons. For this reason I pro- 

 pose to revive Hindsia for the group to which the name was origin- 

 ally given, although Adams himself later united them. 



Oymatium adairense n. sp. 



Shell small, with four glassy, smooth nepionic whorls and four and 

 a half subsequent whorls; color of the shell pale brownish, somewhat 

 darker on the prominences; sculpture of about t>*o varices to a whorl, 

 less on the earlier whorls; on the last two whorls the lines joining 

 the varices are nearly at right angles to each other; the portion of the 

 whorls behind the periphery is flattened, thus making the periphery 

 very prominent; upon it between each pair of varices are three 

 prominent nodules; at the corresponding point on the varices is a 

 conspicuous angle, almost a spine, but the remainder of the varical 

 edge is rounded or crenate by the spiral sculpture; the only other 

 axial sculpture is the sharp sulci which cut the spirals; these spirals 

 are numerous, close set, flat, strap-like cords, separated by narrower, 

 sharp grooves and crossed by many subequally spaced sharp axial 

 sulci; these cut the flat surface of the spirals into minute scale-like 

 segments, but where the spirals cross the varices the interspaces 

 widen; canal rather long, recurved, open; aperture rounded, with a 

 nearly entire, projecting peritreme, smooth on the inner lip, with 

 four or five shallow grooves on the inside of the outer lip. Length 

 of shell 33.0; of last whorl 24.0; of aperture 8.0; maximum diameter 

 of last whorl 17.0 mm. 



Type, U. S. N. Mus., 214103, from 10 fathoms sand, off Adair 

 Bay; an immature specimen in 10 fathoms off La Paz. The latter 

 had the nepionic shell in perfect condition; it comprises over four 

 whorls with a heavy brown periostracum, which bears three spiral 

 lines from which project very minute tufts of short, hair-like processes. 



The species which most nearly recalls this is the C. gibbosum 



