180 SPOLTA ZEYLANICA. 



side a large ventral and small dorsal vessel, the latter strongly 

 and regularly sinuate, outside these the usual nerve, round in 

 section. 



A long thin convoluted chitinous cirrus lies in the cirrus-sac, 

 the duct is finely spinulose, and a seminal vesicle leads into the 

 cirrus-sac ; two small oval testes, 0*10 x 0*06 lie dorsally. 



The wide vagina is ventral to the cirrus-sac ; it is finely 

 spinulose internally- and presents a forcipate apparatus ; it leads 

 into a receptaculum seminis reaching to the middle line ; the 

 fusiform dilatation of the vagina is 0*042 wide. The ovary lies 

 ventrally in the middle third and consists of separate aggregates ; 

 the horseshoe-shaped vitellarium lies near the dorsal side and 

 dorsad of it, the shell-gland. 



Eggs not present. 



Davahiea. 



Scolex with hundreds of very small, generally hammer-shaped 

 hooks in two circles : suckers generally beset with hooks at the 

 margin ; genital pores unilateral or irregularly alternating ; 

 numerous testes; eggs in capsules; parasitic in mammals and 

 -birds. 



45. — Davainea polycalcaria, n.sp. 



PI. II., figs. 28-29. 



Intestine of Corvus macrorhynchus, Tem. ; Colombo. 



Length 65 mm. ; in front the proglottids measure 0*03 long x 

 0-25 broad, in the middle 0-20 x 1-78, behind 0-99 x 1*34 ; they 

 become at the end slightly narrower and longer, but always 

 broader than long; the scolex is button-shaped and very short, 

 0'31 broad by 0'088 long ; the suckers, 0*10, carry several hundreds 

 of small hooks at the margin ; the likewise very numerous hooks 

 of the rostellum are closely packed in circlets, they are pointed 

 and measure 0*015. A transverse muscular layer marks off the 

 broad cortical zone from the medullary layer ; ectad of the trans- 

 verse muscles are numerous longitudinal muscles which do not 

 form bundles ; calcareous corpuscles are closely packed through- 

 out the body ; two large vessels run yV^of cross-diameter distant 

 from margin and are connected by a transverse ramus communi- 

 cans in the posterior part of the segment ; close beside them 

 outside is the nerve. The pyriform cirrus-sac occupies ^V of the 

 cross-diameter ; numerous testes occur in the medullary sub- 

 stance ; they are oval, about 0*039 by 0*01*0 ; female organs not 

 yet developed. 



