[cooper] TREMATODES FROM MARINE FISHES 185 



5. Lepidophyllum steenstrupi Odhner. 17, pp. 68-69; 26, p. 487. 



In urinary bladder of Zoarces anguillaris (Peck), Eelpout. 



6. Sinistroporus simplex (Rud.). 11, pp. 525-26; 26, pp. 484-85. 



In intestine of Pseudopleiironectes americanus (Walb.), Winter 

 flounder, and Pholis gunnellus (Linn.), Butterfish. 



Nine trematodes from four specimens of the first-named host are 

 referred to this species, since they agree essentially with the des- 

 cription of D. simplex Rud. excepting that, as Stafford observed (26, 

 pp. 484-85) and used as the basis for the new generic name, the gono- 

 pore opens in all specimens on the ventral surface to the left of the 

 oesophagus, as shown in Fig. 6. The following measurements of two 

 specimens, both fixed in glacial acetic acid and cleared in oil of cedar- 

 wood, the first being the largest at hand and the other a typical one 

 from the remaining lot (actually that shown in Fig. 6), are given for 

 the sake of comparison: (1) Length, 4; greatest width, 0-86; width op- 

 posite the acetabulum, 0-62; diameter of ventral sucker, 0-40, of oral 

 sucker, 0-17, of pharynx, 0-137, length of same, 0-153; ovum, not 

 ready to be extruded, 0-068 X 0-043; (2) Length, 3-4; greatest width, 

 behind posterior sucker, 0-77; width opposite ovary 0-70, opposite 

 acetabulum, 0-65, at middle of oral sucker, 0-31 ; length of oral sucker, 

 0-23, width, 0-25; length of pharynx, 0-137, width, 0-120; length of 

 oesophagus (slightly coiled), 0-22, (same of straight oesophagus in 

 another speciman, with body length of 2 - 5, - 26) ; width of acetabulum, 

 0-36, length, 0-29; length of stem of excretory vesicle, 1-48; ova, 

 with incomplete shells, average in sectioned material, 0-078 X 0-036. 



In addition it is noteworthy that the testes are crenulated in most 

 specimens, that is, not spherical nor elliptical, as in Stafford's S. 

 productus, (26, p. 485), which in the absence of a more complete des- 

 cription, seems to be probably only large examples of S. simplex. 

 The anterior testis is generally smaller than the posterior and situated 

 to the left of the median line, the posterior being midway between the 

 intestinal coeca. Both have quite thin walls and loosely arranged 

 contents, which doubtless accounts for their different shapes, for in some 

 specimens the outline of the anterior testis is entire. In one worm 

 (Fig. 6) no traces of the testes could be found even in a series of sections 

 10 thick, while in another only one large testis was seen. Furthermore 

 the vitellaria are divided, on each side, into three more or less separate 

 regions, one median to the corresponding coecum of the intestine, the 

 second, lateral, and the third, which may or may not be continuous 

 with the lateral group, opposite the uterus and extending from the 

 hinder edge of the acetabulum to the ovary. The shell-gland is 

 situated to the left of the median line, and the ovary slightly to the 

 right in many cases. The median excretory vesicle branches laterally 



