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Fucitrogus Rhodymenitv. By G. S. Brady. 
M. Thorell, I have previously adopted, I propose to institute pro* 
visionally, for its reception, a new section Choneostomata * Further 
investigation will, doubtless, remove the many imperfections and 
omissions of the following description : — 
Order Copepoda. 
Section Choneostomata. 
Genus Fucitrogus f g. n. 
Fucitrogus Khodymenle sp. n. Plate V. 
Length 0*5 mm. Body broadly ovate, widest in the middle, pro- 
duced at the posterior extremity ; showing little or no trace of seg- 
mentation. There is a well-marked pharynx and digestive cavity 
anteriorly, the boundaries of which are defined by distinct chitinous 
bands, and are corrugated behind, so as to form something like a 
gastric mill. The median portion of the digestive canal has not been 
traced, but there is a distinct anus in the middle line at the posterior 
extremity of the animal. The oral opening is situated in the middle of 
what appears to be a protrusible proboscis, and is probably suctorial : its 
margins are covered with minute cilia ; immediately within the orifice, 
at each side, is a mandible composed of three strong and rather blunt 
teeth (a). There are two pairs of antennae ( b , c), each consisting of a 
single joint terminated by three or four setae, and a little behind 
these is a pair of similar limbs ( d ) with stouter setae, which may, 
perhaps, be looked upon as mandible-palps. Considerably behind 
these, and about on a level with the hinder portion of the gastric 
cavity, are the two most conspicuous appendages, each consisting of 
a large triangular, chitinous base, to the distal end of which is 
attached (/) a group of five stout fusiform processes (somewhat like 
miniature fir-cones), which are beset on all sides with slender lateral 
setae ; four of these processes are of about equal length, but the distal 
process is twice as long as the rest, and is setose only on its outer 
margin. Nearer the base of the chitinous support are two fascicles, 
each composed of three long, simple setae (e). These two sets of 
appendages, together with the setiferous bodies (/), may perhaps repre- 
sent the maxillae and maxillary palps. In some cases these organs 
are thrown forward, projecting in front of the mouth like a couple 
of horns. Considerably further behind and more removed from the 
median line is a pair of limbs (? maxillipeds), bearing two strong 
tooth-like processes ( g ) and five or six long setae ( h ), while near the 
base of the appendage is an elevated circular disc bearing a crown of 
tentacular cirri (i). Still nearer the median line is a simple seta ( h ) 
elevated on a papilliform base, beneath which is a circular (? genital) 
aperture. Near the posterior extremity of the body are tufts of 
ciliated setae (Z Z). 
* X&vri, a funnel. t t puyu, I gnaw. 
1894 
N 
