626 



■a. DAVAJNEA CRASSIILA (Rudclphl. 1819) Rallllet. 1S93. 



asiy. ■T. spheneoephala Rud.," 1810 ot Rudolphi; 181'.). T. 

 crassula Rud., 



( ? 1789, Taenia serpentiformis i. T. turturis Gmelin; ? 1800. 

 A'lyselminthus Columbae Zeder; ? 1803, Halysis Columbae 

 (Zeder, 1800) Zeder; ? 1810, Taenia sphenocephala Rud.; V 

 1891, Davainea Columbae (Zeder, 1800) R. Bl.) 



[PI. XVIII, figs. 243-346.1 



Diagnosis: 2a0mm to 400mm long by 4nini broad. Head oval, 

 rostellum obtuse, armed with about 60 hooks 10 // to 11 /i long. 

 Suckers roun-ded, armed with spines. Neck rather long. An- 

 terior segments verj' short, the following segments a little 

 longer and very wide, the posterior segments infundibuliform. 

 Genital pores unilateral. Eggs united in groups of 10-12 in 

 capsule. Development urknown. 



Hosts: Domestic pigeon (Columba livia domestica); EUTOpean 

 rock pigeon (Columba livia); turtle dove (Turtur turtur); rock 

 partridge _(Ca<;caibis saxitilis); ? tame duck (Anas boschas 

 dom.); parroquet (Psittacus erithacus) [perhaps D. leptosoma?]. 

 Rpidemics: None recorded. 



Little more is Icnowu of this worm thau tlio actual 

 fact that tlie parasites desci-ilicd iiiidcr the synonvinv 

 above are found in pigeons. 



Zeder (1800. pp. 2S1-2S2) found a worm in the turtle dove which 

 he named Alyselminthus columbae. changing the name three 

 yeai-s later to Halysis columbae. This woinn Rudolphi (1810. pp. 

 94-95) renamed Taenia sphenocephala. so there is evidently no 

 doubt that these three terms are synonymous. Rudolphi in- 

 cludes in his literature a worm which Goeze (1782. p. 394) men- 

 tioned in a footnote as having been found in the turtle dove 

 and which Gmelin (1790, p. 3070) quoted from Goeze as Tenia 

 turturis under T. serpentiformis. It is entirely an assumption 

 that Goeze's form is identical with Zeder"s worm, although 

 Gmelin's name refers to Goeze's species. Rudolphi (1819. pp. 

 154. 506-508) described as T. sphenocephala. evidently consider- 

 ing them identical with his sphenocephala of 1SU1. some worms 

 obtained by Bremser; these were preserved in the Berlin 

 Museum, were restudied by Krabbe and pronounced identical 

 with Rudolphi's supposed new species (1819. pp. 702-704) Taenia 

 crassula, types of which Krabbe also examined. 



