Henn: South American Pceciliid Fishes. 127 



the male inperted at about the proximal third of the entire length; 

 ventrals thoracic, minute, not modified. First and second anal rays 

 of the male minute; third, fourth, fifth, and sixth, much prolonged. 

 The third ray forms an obtuse angle near its tip, where it is produced 

 dorsally, joining the tip of the fourth to form the pedicle of the ter- 

 minal process. The fifth ray is longest, terminating in a point; pos- 

 teriorly there is a series of about six retrorse hooks upon its dorsal 

 ridge. Sixth ray compressed posteriorly, bending ventrally to join 

 the fifth. Seventh, eighth, and ninth raj's normal, successively 

 shorter. The terminal organ has the form of a scoop and there is a 

 compressed horn or extension on each side. This is poised at right 



Fig. 9. Phallotorynus fasciolalus Henn. Inferior view of premaxillaries with 

 teeth. One tooth probably missing from left ramus. X 26. No. 3754, Carnegie 

 Museum. 



angles to the pedicle. There is a single series of teeth, shaped like 

 spoon-oars, in each jaw. The tips of the teeth are slightly expanded 

 and bent backward. The intestine is about twice the length of the 

 entire fish. 



This remarkable little fish has attained a high degree of complexity 

 in the apparatus for the transfer of spermatozoa to the female. The 

 sperm-duct, as in related genera, opens backward at the very base of 

 the anal. The sexual products probably appear in the form of the 

 sperm-aggregations, the occurrence of which in Phalloceros caudoma- 

 culatus has already been mentioned. The hinder portion of the anal 

 fin seems to be somewhat flexible and may fold over the inflexible 

 prolonged rays, to form a groove or trough which would have the 

 open side along the ventral edge. The close apposition of the two 

 edges of the fin would form a channel for the conduction of the sexual 

 products. The ventral fins are too small to be of service, but the 

 pectoral fins, although small, by being placed over the mouth of the 

 sperm duct, may cause the entrance of the sexual products into this 



