316 THE ANIMAL PARASITES OF MAN 



The statement that D. cordatus also occurs in Dorpat in human beings 

 has been proved erroneous (Zool. Anzeiger, 1882, v, p. 46), as also has the 

 report that this worm lives in hares in the neighbourhood of Berlin, whither it 

 was supposed to have been carried by Esquimaux dogs (Rosenkranz in Deuisch. 

 med. Wochenschr., 1877, iii, p. 620). The parasite stated by the author to l>e 

 D. cordatus is Tcenia pectinata, Goeze, which has been known since 1766. 



Dibothriocephalus parvus, Stephens, 1908. 



Largest gravid segments 5 by 3 mm. Uterus forms a central 

 rosette with four to five loops on each side of median line. In a pro- 

 glottid measuring 3*5 by 2*25 mm. the genital atrium is situated 0*4 

 to 0*5 mm. behind the anterior margin and the uterine opening the 

 same distance behind the genital atrium. Calcareous corpuscles absent 

 in the preserved specimens. Eggs operculated, 59*2 /^ by 407 //-. 



Distinguished from Dibothriocephalus latus (i) by the size of gravid 

 segments (the minimum width of gravid segments of D. latus is 10 

 to 12 mm., so that D. parvus is a much smaller worm) ; (2) quadrate 

 segments of D. latus measure 6 by 6 mm., those of D. parvus 4 by 

 4 mm. ; (3) by the eggs. 



From D. cordatus it is distinguished by (i) D. cordatus has only 

 fifty immature segments, D. parvus has at least 200, possibly more ; 

 (2) mature segments of D. cordatus measure 7 to 8 mm., maximum 

 width of D. parvus is 5 mm. ; (3) quadrate segments of D. cordatus 

 measure 5 to 6 mm. ; (4) D. cordaius has six to eight uterine loops ; 

 (5) D. cordatus measures 75/4 to 80/4 by 50/4. 



Habitat. Intestine of man (Syrian, in Tasmania). 



Genus. Diplogonoporus, Lonnbrg., 1892. 

 Syn.: Krabbea, R. Blanch., 1894. 



The scolex is short and has powerful suctorial grooves ; no neck ; 

 the proglottids are short and broad ; there are two sets of genital 

 organs side by side in each segment, which in all essentials resemble 

 the single one of Dibothriocephalus. 



Parasitic in whales and seals, occasionally in man. 



Diplogonoporus grandis, R. Blanch., 1894. 

 Syn. : Bothriocephalus sp., Ijima et Kurimoto, 1894; Krabbea grandis, R. Blanch. 



Scolex unknown ; chain of proglottids over 10 m. in length, 

 i'5 mm. broad anteriorly, 25 mm. broad posteriorly. The proglottids 

 are very short (0-45 mm.), but 14 to 16 mm. broad. On either side to 

 the right and left of the worm, along the entire ventral surface, there 

 is a longitudinal groove ; these grooves are nearer to each other than 



