602 CHARLES LiscoLn Epwarns, 
4,4—17 and a mean dorso-ventral diameter of 5,7 with a range from 
2,2—8,5. The mean length of the introvert is 2. 
Genital papilla. — In the female the genital papilla is 
usually simple while in the male it is subdivided as in Cucumaria 
frondosa. 
Spicules. — Of the 132 spieules of the body-wall seriated 
from 6 specimens, 64°/, are more or less irregular. perforated plates 
(Pl. 19, Figs. 5 and 6) having a mean length of 82,4 «u with a range 
from 63—180 u; a mean diameter of 61,7 « with a range from 
31,5—148,5 u; and a mean number of holes of 4,4 with a range 
from 1—12. The remaining 36°/, are elongated, slender rod-like 
spicules (Figs. 7”—10), having a mean leneth of 120,6 « with a 
range from 585 u to 198 u; a mean diameter of 40,5 «u, with a 
range from 22,5—72 u; and a mean number of holes of 3,2 with a 
range from 0—7. Most of the spicules present a more or less rod- 
like appearance, for even the irregular plates are one-fourth longer 
than broad. In the pedicels the supporting plates are heavier 
(Fig. 11), and often have a 2 or 3 pronged base with a spinose 
and knobbed outer portion projecting from the surface. The end- 
plates are multiple being made up of from several to many rods, 
rosettes, and plates (Fig. 12). The tentacular spicules are mostly 
straight (Fig. 13), or slightly curved, supporting rods, but there are 
some plates with as many as 20 holes. Knobs, or spines, or both 
are present in 72°/, of the spicules. In some of the holothurids the 
spicules show degenerative changes and 4 individuals have no 
spicules. In certain cases small round, or conglomerate calcareous 
particles (Fig. 14) occur in the body-wall. 
Habitat. — The geographical distribution is from Captain’s 
Bay, Unalaska and Bering Island, in the north Pacific Ocean to the 
Galapagos Islands. Also Mazatlan, Gulf of California, SEMPER, 1868. 
Localities of the 46 specimensin the United States 
National Museum. — 0° 29' south latitude, 89% 54' 30“ west 
longitude. Galapagos Islands, depth, 392 fathoms. Captain’s Bay, 
Unalaska. Afognak Bay, Afognak Island, Point Lipsett, S. 15° E., 
1,7 miles, depth 12—17 fathoms. Alitak Bay, Kadiak Island, Cape 
Alitak S. 41° W., 7,1 miles, depth 36—44 fathoms. Chiniak Bay, 
Kadiak Island, depth 25—50 fathoms. 54°52° north latitude, 159° 
46‘ west. longitude, depth 21 fathoms. Unalaska Beach. 54° 15’ north 
latitude, 165° 06° west longitude, depth 34 fathoms. 54° 42° 15“ north 
latitude, 164° 49' 15“ west longitude, depth 27 fathoms. 54° 49'530" 
