613 



B. Suckers armied : genei-a Davniiu-a, I^chinoootylf, and 

 Ophryocoytle. 



Genus DAVAINEA R. Blanchard & RallUet. 1891. 

 ( ? 1893, Cha-praania Monticelli.) 



Diagnosis: Worms of small or medium size. Head rounded, 

 surmounted by a rostelluim or hollowed by a depression, but 

 armed in either case with a double row of numerous small 

 hooks possessing a special form (prong and dorsal root short, 

 ventral root very long, giving them the form of a hammer). 

 Suckers rounded, bordered with several rows of small hooks 

 which are instable or persistent. Genital pores generally un- 

 ilateral but occasionally irregularly alternate; in the former 

 case (unilateral pores), the ova are generally arranged in 

 groups, in egg capsules; ovary in some species develops into 

 the uterus; eggs also isolated, scattered through the paren- 

 chyma; embryos without pyriform body. 



Type species; As the type species has evidently never been 

 proposed, I propose D. proglottina (Davaine, 1860) R. Blanchard, 

 1891, as type. 



Development: As yet little known; the larvae of some species, 

 however, have been found in certain artbriopods and mollusks. 



Habitat: Intestine of birds and mammals. 



Blanchard (1891B, pp. 428-440) recognizes fourteen 

 species as belonging to this genus, and thinlis that T. 

 cantaniana and T. clavulus may also be placed here. 

 Some of the forms Blanchard includes here are well 

 established, others rest upon weak characters. 



Monticelli (18IJ3, pp. 1G17) has recently proposed a 

 new genus Chapmania which seems to be very closely 

 related to, if not identical with Davainea. His diag- 

 nosis reads as follows 



Head rounded, small, with a protractile anterior sucker 

 armed on tts anterior margin with a crown of very minute 

 booklets. Suckers rather large, unarm'Cd. Proglottids cam- 

 panulate. Genital pores unilateral. Te.=ticle single. Ovary 

 hilnbed, dendritic. 



Monticelli took Zschokke's (IS.'^S. pp. 2 0, 41-40) 

 Taenia nrgentina a.** basis fci- liis genus. ;inil rdjisiilci'cd 



