232 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[232 



shallow. Vagina anterior or posterior to cirrus-pouch. Vaginal opening 

 frequently dorsal to cirrus-pouch. Testes 130-160 in number, arranged 

 in two lateral fields. Size of testes 0.026-0.04-0.06 by 0.053-0.07 mm. 

 Vas deferens a mass of coils extending from cirrus-pouch to mid-field. 

 Cirrus-pouch 0.25-0.29-0.33 mm. long by 0.100-0.136 mm. broad. Ratio 

 of length of cirrus to proglottid breadth 1 :6-l :5 in mature and 1 :4 in 

 ripe proglottids. Ductus ejaculatorius with numerous coils. Cirrus 

 broad, muscular, not seen protruded. 



Vagina broad at distal end, never crossing cirrus-pouch in course 

 to mid-field. Course of vagina to interovarial space sinuous. Sphincter 

 vaginae present. Receptaculum seminis not seen. Ovarian lobes slender 

 in young proglottids, broad in old. Vitellaria with small follicles. 

 Uterus when fully developed possessing 24-35 lateral pouches on either 

 side. Uterine pores ventral, 2-4-5 in number. Eggs provided with 

 three membranes. Outer membrane variable in size, second one thicker, 

 0.022-0.024 mm. in diameter, inner one granular, irregular, 0.014 mm., 

 embryo 0.012 mm. 



Habitat: In intestine of Laches is (Bothrops) lanceolatus L. 



Host 



Lachesis (Bothrops) lanceolatus L. 

 Lachesis (Bothrops) lanceolatus L. 

 Lachesis (Bothrops) lanceolatus L. 



Barrois' (1898) description of this species while meager and un- 

 accompanied by drawings agrees fairly well with the descriptions of 

 later investigators. His specimens came from Lachesis (Bothrops) lan- 

 ceolatus L. from Martinique from which host they were secured by 

 Professor Calmette. Later in the same year Marotel (1898) briefly 

 described this species under the name 7. raillieti. His specimens came 

 from Lachesis (Bothrops) lanceolatus L. from Martinique. Liihe (1898) 

 called attention to the fact that I. raillieti was a svnonym of 7. calmet- 

 tei, and he included the form in his list of species of Ichthyotaenia. 

 Marotel (1899:34-42) in a more extended paper described this species. 

 His paper is accompanied by several drawings. 



Parona (1901) listed this species in a record of parasites from 

 South America under the name of Ichthyotaenia racemosa. His speci- 

 mens are from B. lanceolatus L. from Sao Paulo, Brazil. Schwarz 

 (1908:24-26) added but little to the work of Barrois and Marotel. He 



