KEPOET ON THE HOLOTHHEIOIDEA. 
105 
Ciicumaria chronhjelmi, n. sp. 
Body indistinctly pentangular. Pedicels numerous, cylindrical, long, forming ap- 
parently a double row along each ambulacrum ; at the middle of the body they 
seem to be more crowded, there being three to four rows, but this is probably 
a result of the contracted state of the body. Tentacles ten, two ventral 
smaller. Anus with small teeth. Polian vesicle and madreporic canal single. 
Calcareous ring very fragile, the interradial pieces being conical, pointed 
anteriorly ; the radial obtuse, fun’owed anteriorly and terminating posteriorly in 
two very' slender prolongations. Deposits crowded, of two kinds ; in the 
external layer of the perisome small reticulated spheres or globular cups ; in 
the internal layer numerous hollow fenestrated ellipses of different size and 
shape, some being of a more elongated form, others more rounded, globular, 
and some being several times larger than the rest ; among the larger ellipses 
are found here and there rather large scale-like bodies, composed ap- 
parently of a network of several superposed layers. Undeveloped ellipses, 
consisting of a small oval concave plate with four holes, may also be found. 
The pedicels have, round the large tenninal plate, some irregular pciforated 
plates, and, besides, numerous elongated rods with four holes at the slightly 
enlarged middle and a row of holes along each arm ; the middle of the rods 
usually carries a kind of low conical, rounded spire. Length of the largest 
specimen, 55 mm. Colour, whitish. 
(Mus. Holm.) Some specimens dredged at Vancouver’s Island. 
Cucumaria glacialis, Ljungman, 1879. Cucumaria minuta, Stuxberg, 1878. 
Pedicels in simple rows towards the extremities of the body. Deposits — large, 
thick, reticulate, roundish or angular scales ; and small undeveloped cups 
consisting of a cruciform body with the ends of the curved arms provided with 
three processes. 
Habitat . — Spitzbergen (Ljungman), Nova Zembla (Stuxberg). 
(Mus. Holm.) Numerous type-specunens obtained at Spitzbergen and Nova Zembla. 
At the middle of the body the pedicels are placed in double alternating rows. 
The calcareous scales, visible to the naked eye, are more or less close together, 
and built up of several (two or three) superposed reticulate layers so as to 
constitute solid reticulate bodies. The cups, which are rather solid, are devoid 
of rim because of the four (seldom three or five) curved arms not being united 
at their free outwardly directed ends. Calcareous ring very slender, devoid 
of posterior prolongations. Polian vesicle and madreporic canal single. There 
seems to be reason for believing this species to be identical with Pabricii s Ocnus 
minutus. 
(ZOOL. CHALL. EXP. PART XXXIX.— 1886.) 
Qqll 
