Trematodes and Cestodes 



llG-H 



necessity of measuring them in the original preserving fluid if not in the fresh 

 condition, especially in view of the fact that in this regard the species of Diphyllo- 

 bothrium which have been reported from seals approach each other so closely as 

 to overlap in many cases. 



Diphyllobothrium lanceolatum (Krabbe 1865) 



This species has also been well described by Zschokke (1903:6-9). 

 Habitat. — -Intestine of Erignathus barbatus (Erxleben), as follows: 



THE OCCURRENCE OF DIPHYLLOBOTHRIUM LANCEOLATUM IN ERIGNATHUS 

 BARBATUS IN ARCTIC AMERICA. 



The material studied differed from that studied by Zschokke in the following 

 points : The specimens were larger, the dimensions of three of the largest being, 

 50 by 2-9 mm., 59 by 4 and 68 by 3; the most anterior coils of the uterus were 

 not strictly to the right and left of the cirrus-sac but rather behind the middle 

 of it; eggs appeared first in the 45th to 60th segment, instead of the 30th, and 

 they were longer — 64 to 68yu by 40yu (cf. Zschokke's 62 by 40ju). 



Diphyllobothrium sp. larv. 



A large number of larval diphyllobothria varying in length from 6 to 25 mm. 

 and in width from • 6 to 2 ■ 5 mm. were found in company with D. lanceolatum in 

 the lot of material collected on July 4, 1915 at C.A.E. Stations 40i and u. They 

 are considerably depressed, lanceolate in shape, and correspond with those 

 described by Zschokke (1903:12-13, Fig. 17, Taf. II) as accompanying larvae of 

 D. schistocMlos (Germanos) in the intestine of P. barbata and doubtfully con- 

 sidered by him as being larvae of D. schistochilos. The material in question 

 resembles D. lanceolatum rather than the latter species as described by Germanos 

 (1895), but on account of the fact that there were present in the lot of material 

 no specimens intermediate in size between the largest of the larvae and the 

 smallest of those diagnosed as D. lanceolatum I cannot say positively that they 

 are larvae of the latter species. 



Diphyllobothrium sp. larv. 

 (Figs. 6, 7.) 



To this genus there is also referred a lot of four poorly preserved bothrio- 

 cephalid larvae which were found in the intestine of a red Canadian trout, 

 Salvelinus marstoni Garman, from a lake at Bernard harbour, on October 1, 

 1915, C.A.E. Station 42o,r, in company with Abothrium crassum and Proteoce- 

 phalus arcticus (vide infra). The specimens are all about 9 mm. in length and 

 from 0-6 to 0-9 mm. in width. The scolex (Figs. 6, 7) bears two elongated, 

 dorsoventrally situated bothria with comparatively thin walls, and on the whole 

 resembles that of species of Diphyllobothrium rather that that of species of Both- 



