394 G. A. MacCallum, 



(Measurements continued) 



Ova: 0,12 X 0,5 to 0,15 X 0,06. 

 Diam. across head: 0,45. 

 Cloacal aperture: 0,04 X 0,10. 

 Diam. of vaginal opening: 0,04 X 0,01. 



Microcotyle caranr/ls n. sp. 



There were found on the gills of a yellow crevalle, Caranx 

 crysos (Mitchill), 5 exaraples of a Microcotyle wliicli differs very 

 markedly from other species. 



The worm is small, measuring only 4,4 mm by 0,8. The ante- 

 rior end is expauded laterally and provided with a sucker at each 

 angle of this expansion. The mouth opens directly into the com- 

 paratively small pharynx from which the short esophagus runs 

 backward to divide into the lateral intestinal coeca which riin dor- 

 sally toward the posterior extremity. A short distance behind the bifur- 

 cation is the cirrus sac which is pear shaped with a curious arrangement 

 of spicules as shown in Fig. Ba and Fig. Bf. Two small clumps of 

 hooklets are separate from the main group which lie in front of the 

 muscular bulb of the cirrus. The Vas deferens can be plainly seen 

 entering the posterior end of this bulb. 



Behind this lies the female genital orifice which is also 

 armed with spicules. The posterior end of the body forms the 

 sucker disc which is hastate in form, one side being continued for- 

 ward so as to make it asymmetrical. At the point there are on 

 each side eleven small suckers with a chitinous skleleton formed as 

 show in Fig. Bd. At the extreme tip there are two strong hooks 

 and between them, apparently to stiffen them, are two straight 

 spines which extend almost as far posteriorly as the hooks, the 

 whole being enclosed in a membrane (Fig. Be). On the right side 

 of the body occupying the asymmetrical forward extension of the 

 caudal disc there is a row of twenty-six much larger suckers which 

 diminish in size as they near the body. These are of a quite different 

 structure from any observed in other forms of 3Iicrocotyle as shown 

 in Fig. Bc. The chitinous skeleton is so asymmetrical in form as 

 to give the sucker almost the appearance of some gamopetalous 

 flower. 



The ovary lies across the middle of the body as an irregulär 

 U-shaped structure placed with the convex side toward the head 



