334 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Cucumaria chronhjelmi Theel. Plate 4, figs. 11-20. 
There are two specimens of a Cucumaria , almost pure white in 
color, which doubtless belong to this species described by Theel 
from specimens collected at Vancouver. One is about 70 mm. in 
length, the other about 40. The pedicels are very long (5 mm.), 
and form two very distinct rows along each ambulacrum (fig. 20). 
There are none on the in ter ambulacra. The tentacles are completely 
retracted so that their relative proportions cannot be positively 
determined. The body wall, as well as the pedicels, is made very 
firm by the crowded deposits. These have been quite fully 
described by Th6el, but unfortunately he published no figures, with¬ 
out which it is hard to form any accurate idea of holothurian 
spicules. The deposits in the specimens before me do not wholly 
accord with Theel’s description, yet I feel sure I am dealing with 
the same species. In the specimens from Puget Sound, there are 
at least seven different kinds of deposits, and the more important of 
these I have figured (figs. 11, 12, 15-18). They are as follows : (1) 
supporting rods in the tentacles ; (2) supporting rods in the ped¬ 
icels; (3) terminal plates in the pedicels; (4) large, knobbed, 
perforated plates ; (5) large, smooth, perforated plates ; (6) smaller 
knobbed buttons or hollow ellipses; (7) small reticulated baskets. 
The baskets lie in the outermost layer of skin and are quite abun¬ 
dant ; while some are simple open cups, many have the edges 
grown together over the centre, forming a long spire ending in 
two flaring teeth, and this spire projects outward through the skin. 
Below the baskets is a thick and very dense layer of the buttons, 
ellipses and plates. The large plates and the ellipses are quite un¬ 
common, the great bulk of this layer being formed from the smaller, 
irregular, knobbed and perforated buttons. Besides these slight 
differences which I find in the deposits in the skin, I notice also a 
difference in the calcareous ring. Theel says the calcareous ring 
is very delicate, whereas in the Puget Sound specimens it is well 
developed and quite large. This is perhaps a difference of degree 
rather than of kind. In all other particulars his description would 
answer for the specimens before me. 
Cucumaria lubrica sp. nov. Plate 4, figs. 21-28. 
Body short, cylindrical, rather blunt at both ends, the surface very smooth. 
Pedicels in a double row along each ventral ambulacrum, but there are also 
