NO. 2258. TABNIOID CESTODES OF DOGS AND CATS— HALL. 



71 



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WBSSA 



Jl;fm^c 



m0- 



ingesting the primary host, a thing which might readily occur if the 

 usual primary host is some small mammal. This would be a quite 

 unusual and interesting case, where the infestation with a larval 



stage depended on the 

 ingestion of a primary 

 host by a secondary 

 host. But in view of 

 the fact that the sec- 

 ondary host must in 

 turn be eaten by the 

 primary host, and in 

 view of the fact that 

 the only known inter- 

 mediate hosts of a spe- 

 cies of Dvpylidium are 

 insects, Diamare's hy- 

 pothesis needs experi- 

 mental verification be- 

 fore it can be accepted. 

 Diamare (1892«) first 

 gave the number of 

 hooks in this species as 

 65, but later (Diamare, 

 1893) gave the number 

 as about 80. 



DIPYLIDIUM PASQUALEI 

 Diamare, 1893a. 



Specific diagnosis. — 

 Dipylidium: Head (fig 

 74) globular, 800 to 900 

 ]}. in diameter. The 

 elongate, 

 claviform 

 rostel 1 u m 

 is acumi- 

 nate ante- 

 riorly and 

 i s armed 



with 16 circlets of hooks which 



have a discoid, almost circular base, 



and are 7 ^ long and 8 [;, wide, 



those of the last row being smaller. 



The suckers are rounded. The 



strobila is from 20 to 30 cm. long 



or longer. The genitalia develop 



rather late and mature segments 



(fig. 75) are still rather short and quadrilateral. 



m^ 





Fio. 74.— Dipylidium pas- 

 QUALEi. Anterior por- 

 tion OF strobila. En- 

 larged. After Dia- 

 mare, 18936. 



Fig. 73.— Dipylidium trinchesei. 

 Gravid segment. Enlarged. 

 After Dumare, 18936. 



Fig. 75.— Dipylidium pasqualei. Mature seg- 

 ment. Enlarged. After Diamare, 18936. 



The genital pore 



