6l2 



CESTOIDEA 



that the cysticercus may be found in the cockroach {Periplaneta 

 orientalis or P. antericana). 



Allied genera are common in rats, hares, fowls, pigeons, turkeys, 

 pheasants, partridges, grouse, and other birds. 



Davainea asiatica von Linstow, 1901. 



Synonym.- — Tcenia asiatica von Linstow, 1901. 



This worm was found in a person in Aschabad, near the northern 

 frontier of Persia, and consists of 750 proglottides without a head. 

 The genital pores all lie on the same lateral border. The testes are 

 globrdar, the cirrus pouch pyriform. The female organs lie an- 

 teriorly, with a large ovary and a small vitellogene gland. There 

 is a large receptaculum seminis. The uterus breaks into sixty to 

 seventy large egg follicles. Nothing is known about the appearance 

 of the mature egg, or about the life-history. 



Subfamily 3. T^niin^ Stiles, 1896. 



Definition. — TcBniida, usually of considerable length, with 

 segments longer than they are broad. Scolex with either a 

 rostellum armed or unarmed, or an apical sucker. Genital pores 

 irregularly arranged on the lateral borders. Genitalia single. 

 Testes numerous, placed laterally. Ovary shell and vitellogene 

 gland situated posteriorly. Uterus, a single median trunk, from 

 which lateral branches develop later. Eggshell thin; embryonic 

 envelope (embryophore) thick, with radial stripes. Cysticercus 

 generally in herbivora, adults in carnivora. 



Tgenia Linnaeus, 1758. 



Definition.^ — Tceniinae with the characters of the subfamily. The 

 genus Tcenia is subdivided into three subgenera : 



Subgenus i. Tcenia Linnaeus, 1758. Type: T. (Tcenia) solium. 



Subgenus 2. Tceniarhynchus Weinland, 1858. Type: T. (Tcenia- 

 rhynohits) saginata. 



Subgenus 3. Multiceps Goeze, 1782. Type: T. (Multiceps) 

 ccenurus. This, hovN^ever, is not a human parasite. 



Taenia (Taenia) solium Linnaeus, 1758. 



Synonyms. — T, cucurbitina PallSiS, 1766; T.pellucida Goeze, 1782; T. vulgaris 

 Werner, 1782; T. dentata Batsch, 1786; Halysis solium Zeder, 1803; T. armata 

 humana Brera, 1808. 



The name ' solium ' is derived from a Syrian term schuschl, meaning a chain, 

 which has arrived at its present form by being first turned into Arabic and 

 finally into Latin. It is often called the armed tapeworm. 



This worm is cosmopolitan in its distribution, for it can be fovmd wherever 

 a pig and a man can live, for the cysticercus lives in the pig, man, and rarely 

 in sheep and dogs, while the tapeworm only lives in man. Even monkeys 

 appear not to be capable of infection. 



It seems to be more widespread in the tropics than in the Temperate Zone. 

 It is not uncommon in Ceylon, and it is apparently common in Panama. 



