4 
histology of Neomenia with my own preparations of Proneomena 
than the perusal of the text alone could ever give. 
Prof. E. Ray LANKESTER, who has made a series of sections of 
two specimens of Neomenia, colleeted by the Revd. A. M. NoRMAN 
(24), and who was about to set to work at them himself, has 
generously sent me his sections for inspeetion, even before he exam- 
ined them himself and thus enabled me still further to draw the 
comparison between these two closely allied genera, which have 
hitherto been of so rare occurence. 
EXTERNAL APPEARANCÜE. 
The two spirit speeimens of Proneomenia sluiteri had the appear- 
ance of two light brown, stiff, eylindıical bodies, more or less 
bent at both rounded extremities, one extremity being somewhat 
thicker than the other (fig. 1 and 2). 
No external appendages are anywhere visible; ventrally the pre- 
sence of a groove (enclosing the foot) is indicated by a dark longitu- 
dinal line: the borders of the groove close up towards each other 
in the preserved specimens. In the prolongation of this groove, 
close to the extremities, two openings leading into the interior are 
visible: the mouth at the thicker end, separated from the ventral 
groove by an interspace of the integument (fig. 3), the anus at 
the other extremity, not separated from the groove, but having 
the appearance of a widened portion of it (fig. 4). 
A third opening leading into the interior may be detected (with 
some difficulty however) at the anterior extremity of the ventral 
groove. This opening is slit-like (fig. 3, f), separated from the 
mouth only by the intervening portion of the epidermis and leads 
into a gland hereafter to be mentioned. 
INTEGUMENT. 
The stiffness of both the spirit-specimens of Proneomenia sluiteri 
was such as to lead to the presumption that the integument must 
