402 Zoological N. Y. Zoological Society. [I;20 



Measurements of Diplectanum lactophrys, n. sp. 



Length of body 1 mm. 



Width of body 10 mm. 



Diameter of disc .15 mm. 



Length of cirrus .10 mm. 



Diplectanum balistes, nov. sp. 

 (Fig. 135) 



On January 13, 1913, on the gills of a trigger fish, (Balistes 

 carolineyisis) were found a few examples of a small worm which 

 on close study proved to be a Diplectanum and a new species, in- 

 asmuch as it differs from any others of the genus examined. It 

 is but .55 mm. in length by .09 mm. in width. The body is elon- 

 gated and, unlike many of the other members of the family, it 

 becomes decidedly and abruptly smaller near the discal end and 

 the disc itself is very different from that of the others. Instead 

 of being trumpet-shaped it is merely a straight tube armed with 

 four hooks and about six smaller ones. The large ones measure 

 .02 mm. and the smaller ones .003 mm. The hooks also are dif- 

 ferent in shape from those of the other forms described (Fig. 

 185). 



The m^ale genitalia consist of one testis situated near the 

 middle of the body and just posterior to the ovary. The vas 

 deferens runs dorsal to the ovary in a convoluted form to join 

 a fusiform vesicula seminalis which lies to the left of and slightly 

 posterior to the genital pore. At its anterior end it narrows 

 into a small tube which enters the bulbus ejaculatorius and 

 passes through to enter the cirrus, which in this instance is an 

 almost perfectly straight tube (Fig. 134a) and in the specimen 

 under observation lies pointing anteriorly directly across the 

 genital pore. It is almost .04 mm. in length. 



The female genitalia consist of the ovary lying, when viewed 

 ventrally, partly on the testis. It is oval and narrows anteriorly 

 into the oviduct, which is almost immediately joined by the duct 

 from the seminal reservoir which receives the vagina from the 

 right side. The genital junction is just anterior to the ovary 

 and the uterus, which is short, terminates at the edge of the 

 genital pore. 



