20 Nils Hj. Odhner. 
(according to Koren & Danietssen) 30 mm; height and breadth 
about 3 mm. 
The genus Drepanomenia was established by Heatn in 1911 
on the basis of a single species, D. vampyrella, from the Sand- 
wich Islands, 304—315 fms. The present form shows in all 
essentials the same characteristics and proves to belong to the 
genus. It differs from the type in having its spicula (fig. 22) of 
more uniform breadth and more slender, though they are like- 
wise truncated in their basa! ends, and in the folds of the ven- 
tral furrow which are 5 (or 3 if the outermost ones are consi- 
dered bifid), as well as in some features of the inner organization 
(see below). 
The folds mentioned extend uninterrupted all along the fur- 
row from the ciliated crypt as far as the cloaca; in front of the 
latter they diminish in size. ‘Whether they terminate before ar- 
riving to the cloacal cavity or continue round its margin, passing 
into its lining epithelium, could not be ascertained by an exa- 
mination in toto; in any case no precloacal pit exists. 
Like D. vampyrella described by Heatn, the present species 
has a cuticula containing long and slender papillae with knob- 
like heads (fig. 22). These papille are largest and most numer- 
ous in the upper sides of the animal (cf. fig. 21). Inside the 
cuticula there follows a layer of circular muscles, then a stratum 
of oblique ones crossing each other in two directions, and inner- 
most a longitudinal layer. The longitudinal muscles give rise to 
two thick strings at the sides of the ventral furrow, and from 
their inner margins there are extended strong oblique cords to 
the lateral and the dorsal body sides, forming septal muscles; 
smaller cords also radiate through the ventral muscle strings 
(fig. 21). | 
Above the ventral furrow, separated from it by a layer of 
crossing transversal and longitudinal muscles, there appears, on 
the under side of the intestine, the ventral blood vessel; on each 
side of it the posterior pedal gland extends as a string of vividly 
blue-coloured cells. Even in the septum which forms the roof 
of the ventral vessel and is expanded beneath the intestinal wall, 
glandular cells occur. The glandular cells are like those of Nco- 
menia figured by Wirén (1892, pl. IV, fig. 5) but have longer 
efferent capillaries and contain large quantities of granula, arranged 
in series in the processes. The pedal nerve cords rnn surrounded 
