No. 5 meserve: monogenetic trematodes 55 



Comparisons. G. acanthocybii has 223 to 245 posterior suckers 

 as compared to 120 in G. acanthurum (Par. and Per., 1890) and 

 thirty-seven in G. carangis (MacCal., 1913). It also differs in size, 

 number, and arrangement of genital spines and posterior suckers 

 from G. acanthurum and G. carangis. 



G. acanthocybii is named after the genus of its host, Acantho- 

 cybium. 



The genus Gotocotyla was named by Ishii in 1936, but at the 

 present writing his paper is not available to the writer. The genus 

 is apparently like Microcotyle, but with a pair of hooks at the pos- 

 terior end of the body. 



Gotocotyla elagatis, new species 



(Plate 7, figs. 37-40) 



Host: Elagatis bipinnulatus (Quoy and Gaimard) 



Location : Gills 



Locality: Bahia Honda, Panama 



Number: 4 



Body lanceolate, bluntly pointed at anterior end, pointed at pos- 

 terior end, 3.263 to 6.200 mm. in length by 0.550 to 0.661 mm. in 

 greatest width. Posterior haptor approximately one fourth entire 

 body length, not distinctly marked off from rest of body proper, 

 with ninety to 100 suckers. Posterior suckers slightly longer than 

 broad, 0.044 to 0.060 mm. in length by 0.036 to 0.044 mm. in 

 width. Chitinous skeleton of each sucker (fig. 39) complex, con- 

 sisting of twenty-two pieces, two strong curved pieces on one side 

 in lateral wall of sucker and two slender curved pieces on opposite 

 side; one wide short piece on side bearing the two strong pieces, 

 in base and extending obliquely outward almost one half the length 

 of sucker; at base on other side one strong piece bent toward base 

 of sucker at middle; eight to ten slender Inverted U-shaped pieces, 

 equidistant apart in outer half of sucker on the side bearing the 

 two slender upright curved rods; six small pieces scattered through- 

 out lower half of sucker. Two hooks at posterior end, 0.40 to 0.48 

 mm. in length, with strongly recurved points bending to right and 

 left away from each other with their points directed outward. An- 

 terior suckers elliptical, longer than broad, 0.060 to 0.076 mm. in 

 length by 0.032 to 0.044 mm. in width, with membranous septa. 

 Pharynx bulb-shaped, 0.020 to 0.060 mm. in length by 0.018 to 



