NO. 1105. 



PROCEEDINGS OP THE NATIONAL MUSEUM. 



167 



Types. — Bureau of Animal Industry Cestode Series No. 1349 desig- 

 nated as type, and deposited with sections of paratypes (Nos. 1350-1352) 

 in United States National Museum. Paratypes distributed as follows: 

 America: Collection of Bureau of Animal Industry; collection of Stiles 

 (U.S.iSr.M.); collection of Hassall; collection of M. J. Elrod (Blooming- 

 ton, Illinois). Europe: Berlin Museum; Vienna Museum; collection 

 of Blaiicliard; British (South Kensington) Museum (London). 



Geographical distribution. — North America (Wyoming, by Elrod, and 

 Lake George, New York, by Fisher). 



BERTIA AMERICANA LEPORIS (Stiles, 1895), Stiles, 1896. 

 (Plate X, figs. 11-15.) 

 1895, Andrya americana Icporis, Stiles, Vet. Mag., II, June, p. 344. Aug. 28, 1895. 



Of this form I have but five specimens, all in exceedingly poor con- 

 dition and unfit for any histological observations or detailed anatomical 

 study. Enough can be seen on the preparations, however, to give a 

 diagnosis which distinctly separates the parasites from all the other 

 forms found in rabbits. 



The si^ecimens were collected by Cooper Curtice; when they came 

 into my possession there was nothing upon the label to give any clue to 

 their origin, other than that Curtice collected tliem from Lepus. 



The specimens (Bureau of Animal Industry, Cestode Series Nos. 

 1170-1172, 1175-1176), all mounted, measure 23 to 47 mm. long, the 

 widest segments attaining 5 to 0.5 mm. in breadth. Due allowance must 

 here be made for the contraction of the specimens and the fact that 

 they were subjected to pressure in mounting. 



The head is present on all specimens, and varies in measurement, as 

 shown in the following table : 



Measurements of heads of Bertia americana leporis. 



The form of the head can not be taken as a character of value, as it 

 varies according to contraction. Plate X, figs. 12-13, show the heads 

 of Nos. 1170 and 1170, U. S. N. M. Bostellum coukl not be distinguished. 

 The four suckers are jiowerful, and open diagonally forward ; they are 

 unarmed in the specimens at hand; their diameter varies between 0.22 

 and 0.24 mm., the muscular wall measuring about 64 // thick. There 

 is no neck present, the segments being perfectly distinct immediatel}' 

 back of the head. 



The number of segments in the different specimens varies from about 



