Q PEOCEEDINGS OP THE NATIONAL MUSEUM vol. 74 



in which testes were plainly seen the series reads as follows, each 

 number representing so many per cent: 0, 0, 0, 0.5, 2, 4, 5, 8, 10, 

 22, 39, 59, 60, 81, 82, 100, 100. 



In this connection Stiles and Hassall's types of this species were 

 examined, and many segments were fomid in which the triangular 

 arrangement of testes is by no means distinct. As has been shown 

 by G. Theiler, M. planissima may also show this arrangement of testes 

 in some segments, and in this species I have found it to be present in 

 as many as 215 of 335 segments showing recognizable testes. It is 

 therefore concluded that the triangular grouping of the testes is 

 not a good specific character. 



Moniezla alba has been distinguished by the absence of the inter- 

 proglottidal glands. As reported by Theiler, these glands are 

 sometimes very indistinct, or even absent; and as shown in the 

 writer's observation there may be actually more segments without 

 these glands than with them. In this connection Perroncito's type 

 material was examined. The differentiation of the stain is poor in 

 these specimens, which may account for the fact that it was im- 

 possible to find definite interproglottidal glands, but in Stiles and 

 Hassall's original M. dlha material it was possible to find satisfactory 

 assurance that glands of the linear type were present in some of the 

 segments. Doctor Hassall has informed the writer that at the 

 time of the writing of the joint paper by Stiles and Hassall some 

 doubt was entertained as to the validity of this species. It therefore 

 seems most probable that the absence of interproglottidal glands is 

 not a good specific character. 



Moniezia conjugens has been described by Sauter as showing both 

 types of interproglottidal glands in the same worm. The writer has 

 not found any specimens of this kind, but has seen in M. planissivia 

 small portions of gland separated from the main strip and having 

 the appearance of the saccular type when examined under a low 

 magnification. However, when greatly magnified these glands are 

 seen to be of the linear type as there is no evidence of any grouping 

 of the gland cells round blind sacs. It is possible that Sauter over- 

 looked this point but it seems preferable to leave his species, pending 

 a reexamination of the original material, as a species inquirenda. 



■Moniezia palUda from the horse has recently been described by 

 Monnig who kindly sent some of his type material to the Bureau 

 of Animal Industry section of the United States National Museum 

 Collection. The distinctive feature of this species is that the folds 

 of the uterus pass ventrally, as well as dorsally, beyond the longi- 

 tudinal excretory vessels. The writer sectioned several segments of 

 this material and in each place found this disposition of the uterus to 

 exist. He also sectioned six segments of M. expan^a and four of 

 M. plamissiina^ each segment from a diffei-ent worm, and found in 



