Holothurians allied to Cucumaria frondosa (GUNNER). 603 
north latitude, 164° 49' 15“ west longitude, depth 43 fathoms. 55° 
44'20“ north latitude, 162° 17'30“ west longitude, depth 22 fathoms. 
56°28' north latitude, 161° 16'30“ west longitude, depth 39 fathoms. 
56° 33‘ 30 north latitude, 164° 31‘ 40“ west longitude, depth 43 fathoms. 
56° 44°30“ north latitude, 159° 16‘ west longitude, depth 16 fathoms. 
57°04‘ north latitude, 170°24° west longitude, depth 26 fathoms. 
57°05‘ north latitude, 170035‘ west longitude, depth 40 fathoms. 
57°05‘ north latitude, 170° 41‘ west longitude, depth 48 fathoms. 
57° 45‘ 45“ north latitude, 160° 12' 15“ west longitude, depth 30 fathoms. 
Bering Island. 
Cucumaria japonica SEMPER. 
1868. Oucumaria japonica SEMPER. 
In the original description of SEMPER, (ucumaria japonica IS 
considered as scarcely to be distinguished from Cucumaria frondosa 
and is characterized as having (1) only a rudiment of the calcareous 
ring in the form of two small pieces of spongy calcareous matter 
in the connective tissue of each piece, (2) small, elongated perforated 
plates in the body-wall, pedicels and tentacles and (3) very large 
radially placed calcareous plates in the cloacal region of the body- 
wall. In the general part of his monograph SEMPER illustrates from 
this species the histology of the wall of the body and of the enteric 
canal, the central and radial nervous system, the muscles, water 
vascular and other related parts. 
This species agrees with Cucumaria frondosa in most characters 
as form, size, color, number and size of tentacles, arrangement and 
distribution of pedicels, single Polian vesicle, single stone-canal with 
spherical madreporite, respiratory trees, muscles, and the attachment 
of the mesentery of the enteric canal. I do not find the calcareous 
ring so rudimentary as SEMPER describes it but more nearly as 
given in the excellent account of the species by Brırren, 1906. The 
spicules are characteristic and differentiate the form. 
Spicules. — A majority of the perforated plates of the body- 
wall (Fig. 15), are elongated, knobbed, and spinose but some are 
irregularly rounded, or triangular. The plates have a mean length of 
182 u with a range from 70—300 u, a mean width of 81 « with 
. a range from 45—160 u and a mean number of holes of 14 with a 
range from S—47. In the pedicels and tentacles the spicules are 
generally of the same type, but often smaller and more slender 
