DAVAINEA MADAGASCARIENSIS. 167 



complete with head; published by Leuekart in 1891. (Further studied by 

 Holzberg, 1897.) 



Daniels, 1895, British Guiana, one ease (adult, male native), parts of two 

 worms, no head; published in 1895 as Tcenia demerariensis with illustrations; 

 part restudied and published by Blanehard in 1899. 



Andrews, 1909, Manila, P. I., one ease (adult, male Filipino), one complete 

 worm and four nearly complete except the head; deposited, No. 305, in Helmin- 

 thological Collection, Bureau of Science, Manila, and reported in the present 

 paper.^ 



Three other papers are of special interest in the history of this species. 



In 1891 Blanehard and Railliet established the genus Davainea in which they 

 placed about twenty-five species, including D. madagascariensis. 



In 1896 Stiles established D. proglotiina (Davaine, 1860) of poultry as the 

 type species of the genus Davainea. 



In 1898 Holzberg published a careful study jf the reproductive organs of 

 the genus Davainea, Leuckart's specimen of D. madagascariensis being among 

 the material examined. 



IDENTITY OF THE SPECIMEN. 



Certain not insignificant differences between the anatomical structure of the 

 Philippine specimen and that described for earlier sj)ecimens of Davained mada- 

 gascariensis will be noted in the course of the following description. These 

 differences were such that it seemed at first that we must be dealing with 

 another species. Further study of the specimen and a careful comparison in 

 detail with the figures and descriptions of other authors have convinced us that 

 while certain difl'erences exist seemingly scarcely consistent with specific identity, 

 an actual comparison of the different specimens will be necessary before the 

 real value of such variations can be ascertained. Such a comparative study 

 should prove most interesting and valuable as well in clearing up certain ana- 

 tomical difl'erences apparently existing between the several specimens heretofore 

 described. Until the actual comparison of specimens can be made, there is no 

 doubt that Dr. Andrews's specimens found in the Philippines should be placed 

 with those of Grenet, Chevreau, Krabbe, and Daniels in the species Davainea 

 madagascariensis (Davaine, 1809) Blanehard and Railliet, 1891. 



DESCRIPTION OF SPECIMEN. 



The specimens received from Dr. Andrews consisted of five worms, one com- 

 plete with head and gravid seginents, the other four evidently nearly complete 

 excepting the head. The five worms were entered in the Helminthological Collec- 

 tion as number 305, A, B, C, D, E. The specimens were killed in an alcoholic 

 solution of bichloride of mercury and preserved in 70 per cent alcohol containing 

 5 per cent of glycerine. 



The size and general characters are as follows : 



305 A. — ^Thirty-nine centimeters long, head present and strobila complete in 

 one piece from head to gravid seg-ments. 



305 B. — ^Twenty-eight + centimeters long, head and neck missing, remainder 

 of worm in one piece from near the neck to gravid segments. 



^ It may be noted that while Davaine named the species after Madagascar, 

 as indicative of the general locality where the first specimens were found, the 

 parasite has never been reported from Madagascar itself. 



