18 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. 



layer of longitudinal muscles. The eggs are supplied Avith two thin 

 membranes, an inner one close to the oncosphere, Avhich measures 18 

 to 20jLi in diameter, and an outer one 30 to 35/u, in diameter. 



Remarks. 



In addition to D. comitata., two species of Davainea., in Avhich the 

 eggs are grouped in egg capsules, have been reported from wood- 

 peckers — namely Davainea frontina (Dujardin) and D. lutzi Parona. 

 It is possible that in D. cruciata (Rudolphi) also there is a grouping 

 of the eggs in egg capsules, but Fuhrmann (1909, p. HI) saj^s that 

 the eggs, probably, are isolated in the parenchyma, as in Z>. longispina 

 Fuhrmann. D. comitata is certainly, however, specifically different 

 from D. cruciata^ since it possesses only about 80 hooks on the rostel- 

 lum, whereas the latter has about 200. Davainea frontina has about 

 280 hooks and is thus distinct from D. comitata. The size of the 

 hooks in D. lutzi — namely, 18 to 19/x in length — distinguishes this 

 species from D. comitata^ whose hooks are only 11 to 13/x in length. 

 The two species are also different, in that D. lutzi has but 12 to 16 

 egg capsules in each segment (Fuhrmann, 1909, p. 112), while D. 

 comitata has 40 to 50, 



Genus LIGA Weinland, 18S7. 

 For generic diagnosis see p. SO.) 



The genus Liga., proposed by Weinland (1857b, p. 62), has up to 

 the present time received practically no recognition by other authors, 

 and in few instances has it even been mentioned. Stiles (1906a, p. 

 62) lists Liga as a possible synonym of Davainea and also refers to it 

 in an earlier paper (1903hh) ; it- has also been noted by Fuhrmann 

 (1907a, p. 292; 1908a, p. 60), but other writers have passed it by 

 without comment. 



Weinlancrs original description of Liga and its type species Liga 

 punctata is as follows: 



OBSERVATIONS ON A NEW GENUS OF T^NIOIDS. 



In the middle of April, 1856, I found a single living specimen of a new kind 

 of tapeworm in the small intestine of our gold-winged woodpecker (Picus 

 avratus). This Tcenia is remarkable for the structure of its organs of repro- 

 duction. 



As in the human tapeworm (Tcenia solium), so also in this, the genital open- 

 ings alternate from one articulation to the next; but in the former, and as 

 seems generally to be the case in Tsenioids, the testicles lie in the middle of 

 each articulation. (See von Siebold, Vergleichende Anatomie der wirbelloseu 

 Thiere, p. 147 ; and the figure in Blanchard, Recherches sur I'organization des 

 Vers, pL 15, figs. 4, 7.) They were placed, on the contrary, in the tapeworm of 

 the woodpecker, in the anterior part .of the articulation, just in front of the: 



