314 W. B. BENHAM. 



Fig. 36. — Polytoreutes. A very brief description, with a 

 figure, is given by Michaelsen of the hinder portion of the 

 genital system of P. coeruleus, in ' Jahrb. d. hamburg. wiss. 

 Anstalten/ vii, 1890. No details are given of the alimentary 

 system, a. Genital system, sd. Sperm-duct. o. Ovary. 

 M. A large sac, into which open (on.) the oviduct ; the ovisac 

 (os.) and the so-called " spermathecse '^ (w.). This has a 

 unique position and shape; it is produced into lateral pouches 

 (w.^, w.^), and opens externally by a median pore (wo.) in 

 Somite xix. The oviducal pore is shown at op. The prostate 

 (pro.) is long, but how long Michaelsen does not say ; and is 

 beset with numerous secondary sacs. Its aperture is in front 

 of that of the spermatheca on Somite xvii, and is represented 

 by a dotted circle, and labelled p. c. Exterior of Somites 

 XVII, XVIII, and xix, to show the setae and median genital 

 pores j that of the spermatheca in xix, and that of the ducts 

 in XVII. 



Distribution : Zanzibar. 



