16 College of Forestry 
Ficure 5. A partly schematic view from the dorsal side, combining 
facts from several sections of a frontal series. The vitellaria are not 
yet developed, the uterine sack is not dilated, the excretory collecting 
vessel is omitted from the right side and the recurrent vessel from 
the left, parts on different levels are shown on the same level. Magni- 
fied twenty-seven diameters. Crs. Cirrus sac; Exbl. excretory bladder; 
Excy. collecting vessel of excretory system; Exrv. recurrent vessel 
of excretory system; Int. intestine; mt. metraterm; nv. nerve collar; 
Ov. Ovary; ta. anterior testis; tp. posterior testis; ut. uterus; utsk. 
uterine sack. From Osborne. (Reproduced by permission of author 
and Wistar Institute of Anatomy.) 
