368 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Order NUDIBRANCHIATA. 
DO R ID I DAi C RYPTOBRANCH I ATtE. 
Genus GEITODORIS Bergh, 1892. 
Geitodoris mollina Bergh MS. 
A single specimen of an undetermined nudibranch was obtained at Ensenada Honda, Culebra. 
A line from Dr. R. Bergh, to whom it was submitted, denominates it as above, but the description 
had not come to hand at date of printing. 
Order PULMONATA. 
Suborder BASOMMATOPHORA. 
Superfamily AKTEOPHILA. 
Family AURICUUDyE. 
Shell spiral, with reversed nucleus, covered with an epidermis, solid; spire more or less elevated; 
whorls flattened; aperture elongated, contracted by columellar teeth, often having teeth within the 
outer lip; columella generally twisted. 
Genus MELAMPUS Montfort, 1810 
Shell oval conoidal; aperture elongated, narrow; columellar lip with several dentiform plications; 
columella plicate; outer lip sharp, with revolving ridges within; foot truncated in front, bifid behind. 
Type Melampus coniformis Bruguiere = Voluta coffea Linn. 
Subgenus Melampus s. s. 
Melampus coffeus Linnaeus. Plate 53, fig. 13. 
Bulla coffea Linnaeus, Syst;. Nat., ed. x, p. 729, 1758. 
Melampus coffea Binney, Bost. Journ. Nat. Hist., vn, p. 162, pi. lxxv, fig. 21, 25. 
Shell conoidal, with a tolerably well-defined shoulder on last whorl above, which is ornamented 
with a narrow light-colored band; below this are generally two narrow, revolving, light bands, the 
general surface being lead color or lurid brownish; umbilical region sometimes rimate, at others entirely 
closed; on the columella is a single revolving lamina, and higher up on the parietal wall a double 
one; inner edge of outer lip brownish; within this are numerous elongated white teeth or line. 
Length, 18; diameter, 12 mm. 
San Juan; Catona, Porto Rico. Widely distributed in the West Indies, Florida, etc. 
The light-colored revolving bands are sometimes very faint and occasionally are absent. The 
double parietal tooth is a tolerably constant character. 
Melampus flavus (Gmelin?) Binney. Plate 54, fig. 9. 
? Voluta flava Gmelin, Syst. Nat., p. 3436, 1792. 
Melampus flavus Binney, Bost. Journ. Nat. Hist., vii, p. 166, fig., p. 167, 1863. 
? Melampus gundlachi Pilsbry, Trans. Conn. Acad., x, p. 504, 1900. 
Shell conoidal, brownish to chestnut, unicolored, or with two, sometimes three, revolving, light 
bands, the upper on the well-marked shoulder; the base of the shell is sometimes white; there is a single 
revolving subvertical lamina on the columella, and generally another on the parietal wall; the liroe 
inside the outer lip are white and irregular. 
Length, 14; diameter, 9 mm. 
San Juan; Ensenada Honda, Culebra Island; also West Indies; Florida, etc. 
This and the preceding species vary much in form, color, and other characters, and there are 
specimens which can only be named with difficulty. Generally the M. flavus has a single lamina on 
the parietal wall, while that of coffeus is double, but this character is not absolutely constant. The 
former has generally irregular I i rSe inside the outer lip. Occasionally M. coffeus has a white base. 
The nearly vertical columellar fold is tolerably constant and characteristic. 
