ART. 13 TEEMATODE PARASITES OF MARINE MAMMALS PRICE 27 



spirally coiled and free in parenchyma, situated posterior to ace- 

 tabulum and to the right of the median line. Testes lobed and 

 situated in the posterior third of body; the anterior testis has four 

 lobes and measures 500//, to 600/x long by 660/a to 700/x, wide; the 

 posterior testis has five lobes and is 540/* to 700/a long by 680/a to 

 TOOjU, wide. Ovary more or less trilobed, 160/x to 200/* long by 400/i 

 to 440/1, wide, situated slightly to right of median line and about 

 400/A to 440/A cephalad of anterior testis. Mehlis's gland diffuse, 

 dorsad and cephalad of ovary; seminal receptacle large, somewhat 

 ovoid or retort shaped, situated to the right and caudad of ovary; 

 Laurer's canal long and slender. Vitellaria extracecal, each one com- 

 posed of eight poorly defined groups of follicles which extend from 

 a short distance caudad of acetabulum to level of ovary. Uterus 

 with closely packed loops confined to intercecal field between ovary 

 and acetabulum. Eggs oval, 27/x, to 31/* long by 13/* to 15/* wide. 



Hosts. — Erignathus harhatus {^Phoca barbata), Halichoerus 

 grypus^ Phocaena phocoena {^Delphinus phocoena—Phocaena 

 comTnunis)^ Gulo borealis, Fells vivei^ina, domestic cat, dog, and 

 man. 



Location. — Liver (bile ducts). 



Distribution. — Europe; Asia (Siberia). 



Remarks. — The above description is based upon specimens 

 (U.S.N.M. Helm. Coll. No. 3357) labeled '' O pisthorchis felineus 

 (Riv.), Haliclioei^s grypus., Konigsberg Thiergarten, collected and 

 determined by Mtihling," which were donated to the helminthologi- 

 cal collection by Prof. Max Liihe, June, 1902. These specimens are 

 considerably smaller than the measurements given by various authors 

 for C. tenuicollis^ but so far as can be determined from the litera- 

 ture, this species exhibits considerable variation as regards size. 



Whether Opisthorchis tenuicolUs and O. felineus are identical 

 species appears to be a moot question. Braun (1893) stated: "So 

 reiht sich Dist. tenuicolle Rud. aus Phoca barbata dem Dlst. feVmemn 

 Riv. und verwandten Arten an." Miihling (1896, 1898a, and 1898b) 

 was convinced of their morphological identity, as was Looss (1899). 

 Barker (1911) noted that there was a lack of specific characters that 

 would definitely separate the two species. Morgan (1927) also states 

 that several species of the genus, including O. tenwicoUis and 0. 

 felineus^ are very similar and of questionable validity, and points out 

 that widely different hosts, when feeding on the same intermediate 

 host, may become infested with the same species of fluke. After 

 studying the descriptions and figures of (9. tenuicolUs and O. felineus .^ 

 the writer is convinced that they are the same morphological species 

 and should no longer be regarded as distinct. There also appears 

 to be no good reason for considering O. viverrini as valid, especially 

 since the figure given by Fuhrmann (1928) shows that the uterine 



