TREMATODES FROM FISHES — LINTON 49 



Family ACANTHOCOLPIDAE Liihe, 1909 



Genus DEROPRISTIS Odhner, 1902 

 DEROPRISTIS INFLATA (Molin) 



Plate 21, Figure 283 



Deropristis inflata (Moliu), Mantkb, Illinois Biol. Mod., vol. 10, No. 2, p. 110, 

 1926. 



Body densely covered with spines on anterior half, becoming 

 spai^ely scattered on the posterior half. In dorsal view the spines at 

 the anterior end are in regular transverse rows, length, 0.009 mm.; 

 breadth at base, 0.004 mm. On the median line at the level of the 

 inflated portion of the neck there is a patch of larger spines, as much 

 as 0.024 mm. in length and 0.007 mm. in breadth. The spines on the 

 lateral margins of the inflated portion are stout, length 0.021 mm.; 

 breadth, 0.009 mm. On the ventral side the margin of the inflated 

 portion is armed with stout spines, elsewhere the spines are small. 

 Oral and ventral suckers nearly equal ; distance from anterior end to 

 ventral sucker about one sixth of the entire length. The pharynx 

 is a little longer than broad. There is a short prepharynx, and an 

 esophagus about as long as the pharynx. The cirrus was retracted in 

 all the specimens observed. It is armed with relatively long and 

 slender spines. The spinous retracted cirrus is followed by the 

 seminal vesicle, which has a longer anterior and shorter posterior 

 division. The metraterm appeared to lie close to the dorsal side of 

 that portion of the invaginated cirrus which lay in front of the 

 spinous portion. Back of the point of coincidence of position with 

 the cirrus, the metraterm is lined with spines which resemble those 

 of the cirrus. The proportions and relative positions of these parts 

 differ in various individuals. In a typical specimen, 4.69 mm. in 

 length, the anterior ends of the spinous portions of cirrus and metra- 

 term were 0.21 mm. back of the ventral sucker; the metraterm, on 

 the right side of the cirrus, measured 0.56 mm. in length and 0.14 mm. 

 in greatest breadth. The spinous portion of the cirrus was about 0.50 

 mm. in length and 0.21 mm. in breadth. The ovary in this specimen 

 lay 0.7 mm. in front of the first testis, and the anterior end of the 

 first testis was 0.87 mm. from the posterior end of the body. First 

 testis, length, 0.33 mm. ; breadth, 0.19 mm. ; second testis, length, 0.42 

 mm., breadth 0.41 mm.; posterior end of second testis, 0.28 mm. 

 from posterior end of body ; one testis overlaps the other by 0.14 mm. 

 The vitellaria are diffuse and extend from about the level of the 

 middle of the seminal vesicle to within a short distance of the first 

 testis. Folds of the uterus, containing many eggs, fill the body from 

 the seminal vesicle to the first testis. There is a large seminal recep- 



155599—40 4 



