DA VA I NBA MA DA GA SCA RIBNSIS 



6ii 



Hymenolepis (Drepanidotsenia) lanceolata Blochmann, 1782. 



Synonyms. — Teenia lanceolata Blochmann, 1782; T. anserum Frisch, 1727; 

 T. acutissima Pallas, 1781; T. anseris Blochmann, 1779; T. lanceola Batsch, 

 1786; Halysis lanceolata Blochmann, 1803. 



It is common in ducks, geese, and other birds, including the flamingo, and 

 has been found in man in Europe, but the record is considered to be very 

 doubtful; probably the worm should not be included among human parasites. 



Morphology. — It is about 30 to 130 milUmetres in length and 5 to 18 milli- 

 metres in breadth, with a very small globular head. Eggs, with three enve- 

 lopes, oval (50 by 35 {x). 



Life-History. — The cysticercoid lives in a cyclops, which is eaten by ducks 

 and geese. 



Subfamily 2. Davainein^ Braun, 1900. 



Definition. — TcBniidce. Rostellum and suckers armed. Eggs 

 mostly encapsuled. 

 Genus. — Davainea R. Blanchard. 



Davainea R. Blanchard, 1891. 



Definition. — Davaineinae, with a globular head, armed with 

 two rings of hammer-like hooks and four suckers, surrounded 

 by several rings of hooks. 



Species. — D. madagascariensis ; D. asiatica, 



Davainea madagascariensis Davaine, 1869. 



Synonyms. — Tcenia madagascariensis Davaine, 1869; T. demara- 

 news^'s Daniels, 1895. 



This worm was first discovered by Grenet in children at Mayotte 

 (Comores). Over ten infections have been recorded: by Davaine 

 from the Comoro Islands, Leuckart from Siam, Daniels from 

 British Guiana, Blanchard from Nossi-Be, four by Cherreau from 

 Mauritius, and two by Garrison from the Philippines. 



Morphology. — The worm is 25 to 30 centimetres in length, with 

 a maximum breadth of 1-4 millimetres. The scolex has four large 

 suckers and a rostellum, with ninety hooks (18 ^ long). The pro- 

 glottides number from 500 to 700, being 2 millimetres long by 

 1*4 millimetres broad. Genital pores are unilateral, and near the 

 proximal comer. Testes number about fifty, with a long vas deferens 

 and a fusiform cirrus pouch. The receptaculum seminis is long 

 and broad. The uterus is composed of a number of tubes, rolled 

 up on each side into an almost spherical coil. When mature, these 

 windings uncoil and fill the proglottides; then they lose their walls, 

 and the eggs, lying free in the parenchyma, become surrounded by 

 proliferating cells, which form capsules for them. 



As many as 300 to 400 of these capsules may exist in one pro- 

 glottis, arranged in transverse rows. 



The egg consists of the usual two membranes and an onchosphere, 

 which is 8 by 15 ^. 



Life-History. — ^The life-history is unknown, but it is suggested 



