632 



ber about 60. Genital pores unilateral; cirrus pouch visible in 

 twenty-sixth to forty-fifth segments; forty-sixth to sixtieth seg- 

 ments are gravid. The eggs, so far as can be judged from the 

 figure, are scattered and isolated as in D. proglottina. 



I can not see (hat rolonio's description and figure 

 are sufficient to compel or even to allow the recogni- 

 tion of this specific name. If the types can be obtained 

 and restudied, it would of course be proper to rede- 

 scribe them under the specific name cantaniana, but 

 until those types can be found it is useless to waste 

 time speculating as to the possible generic or specific 

 relations of the parasite. I propose to ignore the 

 species entirely, on the ground that the specific name 

 has not been accompanied by a recogni/.able descrip- 

 tion or figure. 



28. Taenia Delatondl Rallllet, 1892. 



(1891, "Taenia sphenocephala Rud.," 1810, of Megnin.) 



[PI. XX, figs. 257-262.-1 



Diagnosis: Strobila 7cm to IScm long, 3mm to 4mm broad. 

 Head hemispherical, rostellum. and hooks absent. Suckers 

 large. Neck O.Smm or more long, at first as broad as head, en- 

 larging distally. Proximal segments very short, following seg- 

 ments slightly longer and very broad, lateral margins convex. 

 Genital pores irregularly alternate, situated near the anterior 

 quarter of the lateral border; two lateral ramefied uteri visible 

 as two longitudinal rows of opaque spots; another submedian 

 series formed by recaptaculum seminis; testicles rather num- 

 erous. Ova globular 62 fi to 65 fi hooks of oncosphere 11 ^ 

 long. Development: Unknown. 



Type specimens: In Alfort collection. 



Hosts: Domestic pigeons (Columba livia domestica) by Del- 

 fond, Railliet, Megnin, and von Linstow. Geographical dis- 

 tribution: France and Germany. 



Tliis appears to be a very peculiar form. Its syste- 

 matic position, as well as its synonymy and anatomy, 

 seem io me extremely uncertain. 



