NO. 2258. TAENIOID CE8T0DES OF DOG 8 AND CATS— HALL. 61 



eggs are ovoid, 40 to 60 ja long by 35 to 43 [i, wide, and have two 

 very thin shells. 



Hosts. — Primary: Canis familiaHs., C. lagopus., Yulpes vidpes 

 {V. vulgaris), Felis catus {F. domestica), Lynx rmhlcus {Lynckus 

 nuhicus), Lynx caracal, Fells sylvestns {Catus sylvestns, F. catus 

 ferus), f Mus musculus. Secondary: Unknown. 



Location.— '^wvaW intestine. 



Localities. — France, Iceland, Germany, Italy, Souidi Africa. 



Life history. — Unlaiown. 



MESOCESTOIDES LITTERATUS (Batsch, 1786u) Doiley, 1894a. 



Synonyms. — Taenia litterata Batsch, 178G«; Alyselminthus lit- 

 teratus (Batsch, 1786a) Zeder, ISSOa; Halysis litterata (Batsch, 

 1786a) Zeder, 1803«; Taenia vtriculifera Walter, 1866; Ptychophysa 

 litterata (Batsch, 1786a) Loennberg, 1896a; Mcsoccstoides utt^icuU- 

 ferus (Walter, 1866) Muehling, 1898&. 



Specific diagnosis. — Mesocestoides: See Mesocestoides lineatus. 



Llosts. — Primary: Canis famiUaris, Vidpes vulpes {Canis vid- 

 pes, Vulpes vulgaris), Martes foina {Mii stela foina)^ Canis aureus, 

 Felis sylvestris {Felis catus). Secondary: Unknown. 



Location. — Small intestine of primary host. 



Locality. — Europe (Italy). 



Life histo7vj. — Unknown. 



Setti (18976) notes the fact that a mnnber of prominent helmin- 

 thologists have regarded Mesocestoides litteratus as identical with 

 Mesocestoides lineatus, and then takes up the arguments adduced by 

 Zschokke (1888) and Condorclli (1891) and concludes that these two 

 writers are in turn in disagreement as to the specific differences said 

 to exist. He himself finds transitional and variable features in the 

 descriptions and his material, which lead him to conclude that the 

 two species are identical or of only varietal standing. The present 

 writer is in no position to pass on the validity of the two species, but 

 there appear to be no descriptions on wdiich a working key could be 

 constructed at present to differentiate the two species, if there are 

 two. Under the circumstances the two names have been retained, 

 but no attempt has been made to write a specific diagnosis, as any that 

 have been seen would vary in no tangible essential feature from that 

 of M. lineatus. 



Family HYMENOLEPIDIDAE Railliet and Henry, 1909. 



Synonijms. — Hymenolepidae Ariola, 1899; Echinocotylidae Ariohi, 

 1899; Dilepinidae Fuhrmann, 1907. 



Family diagnosis. — Taenioidea : Scolex with an armed rostellum 

 or without rostellum. Hooks on rostellum not hammer-shaped. 

 Suckers usually unarmed. A single, or less frequently a double, set 



