Извѣетія Роееійекой Акадѳміи Наукъ. 1918. 



(Bulletin de l'Academie des Sciences de Russie). 



On the Excretory Organs in Giganthorhynchus major 



Bremser. 



(from the Zoological Laboratory of the Military fleademy 



of ^S/Tedieine). 



N. N. Kostylev. 



(Представлено академикомъ И. П. Бородинымъ въ засѣданіи Отдѣленія Физико-Математиче- 

 скихъ Наукъ 14(1) іюня 1918 года). 



The excretory system of the worms belonging to the group of Acantho- 

 cephali has hitherto been known only in one species — Giganthorhynchus 

 gigas Gze., which is more correctly called by priority Giganthorhynchus 

 hirundinaceus Pal Las. The excretory organs of this species were already 

 noticed by Leuckart, but their histological structure and functional signifi- 

 cance were elucidated later by Kaiser. Then they were reinvestigated by 

 Stchepotiew (Scepotiev). These organs belong to protonephridia and lie 

 in the number of one pair near the anterior end of the dorso-lateral parts 

 of the uterine bell in females, and on the sides of ductus ejaculatorius in 

 males. Each of these formations is equivalent, according to Kaiser, to three 

 cells fused together, corresponding to which each of them contains 3 nuclei. 

 They consist of short blind tubules of the third order, with shimmering cilia 

 inside, uniting by several into wider ducts of the second, and then first 

 order; the latter open into the efferent canal of the pronephridium on each 

 side, which in their turn unite into a common canal that runs in females in 

 the wall of the bell to the point of its opening into the oviduct, and in 

 males — opening into ductus ejaculatorius. 



Besides G. hirundinaceus Pall, these organs were not discovered in 

 any of the species, in which was included G. moniliformis Brems., notwith- 

 standing special investigations in quest of them in the latter (Stchepotiew). 



Навѣстіл P. А. Ж. 1918. — 1 687 — 117* 



