CESTODES 



519 



Eecently, in the CentralUatt f. Bad. und Parasit, 1902, Band xxxi, page 

 770, V. Linstow described a 



Tenia hominis n. spr. 

 in the collection of helminthes of the Musee zoologique de 1' Academic Im- 

 perial des sciences de St. Petersbourg. This tenia was found by Anger in a 

 girl in Aschabad. 



The scolex was 2.01 mm. long, 1.34 mm. broad. The vertex contained a 

 rudimentary but not prominent rostellum, 0.24 mm. long, entering deeply 



into the scolex, without hooks. 

 The lumen of the suctorial 

 discs extended antero-posteri- 

 orly, so that they formed 

 regular circles upon cross sec- 

 tions. A ring-shaped promi- 

 nence was noted behind the 

 suctorial discs. 



A B 



Fig. 44. — Tenia asiatica. (After v. Linstow.) 



4, Tenia asiatica, natural size; B and C, schematic cross sections: B, with male, C, with female, 

 sexual organs; g, vessel; n, nerve; h, testicles; va, vas deferens; c, cirrus bag; o, ovary; 

 d, yolk sac; r, receptaculum seminis; v, vagina; D, cross section through a segment with 

 masses of ova. 



The chain of the proglottides was 70 mm. long, 1.11 mm. broad behind 

 the scolex, 1.97 mm. posteriorly. The sexual organs were not developed. 



Hymenolepis (drepanitotcenia) lanceolata, Block, 



a parasite found in many water-fowl, was re- 

 cently expelled in two specimens by a boy twelve 

 years old. The scolex was not found. The 

 length of the tenia is 85-99 mm., its greatest 

 breadth behind the center of the body length is 

 8.5-12 mm. The proglottides are all consider- 

 ably broader than long. The leaf-like thin stro- 

 bila slightly tapers toward the anterior end; 

 posteriorly it extends in uniform breadth and its 

 termination is rounded. The ova possess the 

 shells which are characteristic of the genus hy- 

 menolepis, being far apart from each other. 



This parasite uses, as intermediate hosts, 

 fresh water crabs; the cercocysts are found espe- 



FiG. 45. — Ceecocyst from Cyp- 

 EiNOTUs Incongkuens, 1900. 



