62 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



nerve cords. Genital pore located in mid-line, unarmed, well forward, 

 0.180 to 2.268 mm. from anterior end. Testes irregular, smooth, in 

 posterior fourth of body posterior to ovary, twenty-seven to forty- 

 eight in number. Ovary in anterior part of posterior third of body 

 in shape of question mark, anterior end enlarged, posterior end bent 

 back on itself for a short distance. Oviduct arises from anterior 

 expanded portion of ovary. Uterus greatly expanded to one half 

 body width, from genital pore to ovary, filled with many eggs. Eggs 

 fusiform, pointed at both ends, four times as long as wide, 0.160 

 to 0.176 mm. in length by 0.040 to 0.044 mm. in width with opercu- 

 lum at anterior end and slender polar filament at each end, not quite 

 as long as egg. Nervous system with typical brain on dorsal side just 

 in front of genital pore, lateral nerve cords very prominent with 

 cross commissure connecting them at anterior part of haptor, con- 

 nected at posterior end, with attenuated branch on right side anterior 

 tc suckers at anterior end of long side of haptor and slender nerves 

 arising from lateral nerve cords going to base of suckers. 



Comparisons. A. elongata differs from A. carangis MacCallum, 

 1918 in having an unarmed genital pore and in the number, size, 

 and arrangement of the posterior suckers. A. heterocerca Goto, 1894 

 has thirty suckers on one side of the haptor and nine on the other 

 as compared to twenty-four to twenty-five and four to five, and 

 also differs in body size and size of suckers as well as posteriorly 

 confluent vitellaria. 



A. elongata is named from the fact that it is relatively long com- 

 pared with its width. 



Axine aberrans Goto, 1894 



(Plate 9, fig. 59) 



Host: Tylosurus fodiator (Jordan and Gilbert), agujon, 



or hound fish 

 Location: Gills 



Locality: Port Utria, Colombia 

 Number: 6 



This species was described by Goto in 1894 from the gills of 

 Belone schismatorhynchius. Those found in Colombia are smaller, 

 measuring 1.7 to 2.3 mm. Goto's measure 5.0 mm. in length. In 

 other respects, however, these specimens agree with Goto's de- 

 scription. 



