PARASITIC COPEPODA. 191 



circular, while the terminal part is slender and curved. The second maxillae are 

 short and simple, broadly triangular, with a narrow, pointed, and more or less curved 

 tip. The rudimentary exopod appears as a large papilla upon the basal portion of 

 the appendage, which is fused with the ventral surface of the carapace. These 

 appendages are quite small, less than half the length of the mouth-tube, and are 

 attached at some little distance to the right and left of the base of the latter. The 

 mouth-tube itself is short and wide, somewhat triangular, with a broadly rounded 

 tip ; the mouth opening is terminal with a scanty fringe of hair (fig. 3). 



First maxillipeds of the usual pattern ; second pair enlarged and stout, the 

 terminal claw strongly curved and less than half the length of the basal joint, with 

 an accessory spine on its ventral surface near the base. Basal joint much swollen 

 and furnished at the centre of its anterior margin with a large and stout process 

 projecting diagonally outwards. The under surface of this process is grooved, and 

 into this groove fits the tip of the terminal claw (fig. 4). 



The furca is slender, the basal portion longer and wider than the terminal and with 

 a large elliptical lumen, the branches slender and divergent with rounded points. 



The swimming legs are of the usual pattern, but the basal joint of the second pair 

 is very narrow. The basal apron of the third legs is also short and narrow, but it is 

 attached so far back and the free segment is so short that it overlaps a little 

 the genital segment. Another feature not noted by HELLER is the fact that the 

 dorsal surface of the apron of these third legs projects backward between their rarni 

 as a rounded knob, as long as the rami themselves. These latter are small, well 

 separated, and each is two-jointed (figs. 6 to 9). 



The fourth legs are small and rudimentary, and are entirely concealed beneath the 

 apron of the third legs, another fact not noted by HELLER. They contain only two 

 joints of about the same length, the terminal one carrying three spines, of which the 

 inner one is twice as long as the others. 



The ovaries are rather small and triangular and are situated just behind the eyes 

 at some distance from each other, The oviduct is coiled very regularly in the sides 

 of the genital segment, as can be seen in fig. 10. The cement glands are compara- 

 tively wide and reach forward nearly to the anterior margin of the segment. Their 

 anterior half is curved in toward the mid-line and is occupied by about eighteen 

 large cells, the last two or three of which at either end diminish abruptly in size. 

 The posterior half is even a little wider than the anterior and is filled with a 

 homogeneous mass, in which there is no distinction of cells or ducts. The semen 

 receptacle is bent in a half circle, the convex side forward, and is about the same 

 diameter throughout. The vulvae open near together on either side of the median 

 line. 



The colour of the preserved specimens is a uniform light yellowish gray, without 



pigment spots or lines. 



Total length 4'5 millims., length of carapace 3 millims., width of same 3'35 millims., 



