HEPORT ON THE HOLOTHURIOIDEA. 
107 
numerous deposits. The plates are much elongated, several times longer than 
broad, quite smooth, with numerous holes, which in some narrower plates 
almost form two longitudinal rows. Calcareous ring of usual form without 
posterior prolongations. 
Ciicumaria cucumis [Holotliuria), Eisso, 1826 ; Sars, 1857 ; von Marenzeller, 1874. 
Cucumaria pentactes, Selenka, 1867. 
Body almost like that in Cucumaria elongata. The plates are irregularly rounded or 
oval, several times smaller than those in Cucumaria tergestina, very seldom of a 
more elongated form ; often two holes are larger than the rest. The numerous 
almost spherical, reticulate cups are of a more irregular shape, so that an 
arrangement of radial spokes becomes invisible or very indistinct. Calcareous 
ring of usual form without posterior prolongations. 
Eahitat . — Mediterranean Sea (Sars, v. Marenzeller, HeUer, Ludwig, Greeff, &c.). 
(Mus. Holm.) Two specimens dredged at Bay of Muggia. When compariug 
specimens of this species with equally large ones of Cucumaria elongata, it will be 
found that the caudal portion is not so narrow, and that the pedicels form a distinct 
double row all along each ambulacrum. Three kinds of deposits are present ; 
comparatively small, irregularly rounded, smooth plates, commonly of a more 
undecided shape, with a smaller number of holes, two of which are often slightly 
larger ; large elongated smooth plates with numerous holes, resembling those in 
Cucumaria, elongata ; and minute reticulate cups built up of an irregular net- 
work. Colour, blackish-brown with light pedicels. The species is doubtless 
very nearly aUied to Cucumaria elongata, in which species I also found small 
roundish plates, though not in such gTeat numbers. 
Cucumaria improvisa, Ludwig, 1875. 
Body indistinctly pentangular, tapered posteriorly. Integument thin. Deposits — 
closely placed, irregular, oblong, perforated plates ; and small reticulate cups built 
up of about foiu" curved spokes and a spinous rim. Calcareous ring devoid 
of posterior prolongations. 
Eahitat. — Algoa Bay (Ludwig). 
Probably this form of Ludwig’s is not a distinct species ; it resembles in most respects 
Cucumaria elongata. 
Cucumaria ignava, Ludwig, 1875. 
Body indistinctly pentangular, posteriorly narrowed, anteriorly prolonged iuto five 
points. Integument hard, from numerous plates and reticulate spheres. Anus 
with small teeth. Calcareous ring devoid of posterior prolongations. 
Eahitat . — Gulf of St. Vincent (Ludwig). 
Ludwig does not describe nor figure the calcareous plates, consequently their true shape 
remains unknown. 
