MUSEUM OF COMPARATIVE ZOOLOGY. 7 
922 fathoms; one typical specimen. Lat, 41° 29’ 45” N., Lon. 65° 47’ 10” W.. 
(1880); depth 980 fathoms; one specimen. Lat. 18° 20’ 30” N., Lon. 87° 16’ 
40 W. (1880); depth 600 fathoms; one specimen. 
Holothuria arenicola, Semper. 
Habitat. Charles Island, Gallapagos Archipelago (Hassler Exp., 1872). 
Five specimens. 
Holothuria lubrica, Serenka. 
Habitat. Mazatlan. Two specimens, agreeing in all respects with the descrip- 
tion of Selenka. The ventral cylindrical pedicels are slightly more crowded 
than the small dorsal, conical papille. The curved rods of the integument are 
strongly spinous, especially towards the extremities. 
Holothuria impatiens, ForsKaat. 
Habitat. Charles Island and James Island, Gallapagos Archipelago (Hass- 
ler Exp.). Four specimens. 
Holothuria imitans, Lupwie. 
One specimen is cylindrical, and measures 90 mm. in length and 12 to 14 
mm. in breadth; the other two are more contracted, of an oval form, and have 
a length of 70 mm. and a breadth of 25 mm. The color is dark grayish or 
reddish brown on the back, and lighter on the ventral surface; the pedicels 
and papille are light. The anus is surrounded with five small groups of 
minute papille. In one of the specimens the ventral pedicels are distinctly 
arranged in four series, one along each side and two along the odd ambulacrum, 
each series containing about four pedicels in breadth. The dorsal papille are 
minute, smaller than the pedicels, and scattered without order. There are 
twenty tentacles. 
The tables closely resemble those described by Ludwig, but he has drawn 
them with the upper part undermost, as I suggested in my report on the 
Challenger Holothurioidea. Thus, the tables are completely devoid of disks, 
and their spire carries at its outward end four double teeth. The rounded or 
truncate inward end of the spire also bears some spines. No other deposits 
are to be found in the body-wall itself, but the ambulacral appendages are 
supported by large, slightly flattened rods, which carry a series of prominences 
along each side; these prominences are often united with their ends, so that 
the rods themselves appear to have a series of holes along each side, just as is 
found in the rods of Holothuria surinamensis, Ludwig. 
Habitat. Panama (Hassler Exp., 1872); three specimens. 
