ART. 7 CESTODE PARASITES OF BIRDS LINTON 11 



Strobile. — The larger strobiles are subcylindrical, with short pro- 

 glottides, beginning near the scolex, and increasing in length and 

 breadth gradually and uniformly, the posterior proglottides about 

 one-fourth as long as broad ; lateral margins of strobile bluntly ser- 

 rate. In other and smaller strobiles there is great variety in the 

 shape of the proglottides. For example, in some the proglottides 

 begin near the scolex as closely set transverse striae, which continue 

 for a short distance; first distinct proglottides closely crowded to- 

 gether, margins of the strobile bluntly serrate. Then the proglottides 

 begin to lengthen rather rapidly, soon becoming as long as broad, 

 with prominent, slightly thickened posterior borders; toward tl-e 

 posterior end they may again become shorter and crowded together. 

 Other proglottides are slender and have distinct proglottides through- 

 out the entire length. The largest specimen in the collection, from /-*. 

 stricklandi^ measures about 100 mm. in length, 2.5 in greatest breadth, 

 and 1.5 in thickness; posterior, ripe proglottides, length 0.6, breadth 

 2.5. The cirrus is short, and opens on a papilla in the genital cloaca. 

 The cirrus-pouch does not vary greatly from a diameter of 0.045; 

 the largest diameter noted was 0.057, the smallest 0.028 by 0.037. Tlie 

 voluminous vas deferens lies on the dorsal side of the medullary 

 space. The testes surround the ovary and vitelline gland, and rudi- 

 n:!entary uterus. Their number was not satisfactorily shown, except 

 in young, campanulate proglottides, where there appeared to be from 

 20 to 25, or more. The vagina opens into the gential cloaca on the 

 ventral side of the cirrus papilla. It is sinuous at first, then expands 

 slightly into an elongated seminal receptacle. The vitelline gland is 

 anterior to the ovary on the dorsal side, and is slightly lobed. The 

 ovary is profoundly lobed. The uterus, in ripening proglottides, is 

 lobed, the lobes becoming less distinct as the proglottides grow older. 

 The number of fibers in the muscular bundles is variable. Thus in 

 the section of a ripe proglottis, breadth 1.33, thickness 0.91, the maxi- 

 mum number of fibers in the inner bundles was about 22, in the outer 

 12. In another, the number of fibers in the inner bundles varied 

 from 6 to 22, in the outer from 3 to 8. In another the maximum num- 

 ber of fibers in the inner bundles was 16, more or less, in the outer 12, 

 more or less. The outer laj^er becomes subcuticular for a short dis- 

 tance at the anterior end of the proglottis. 



RECORD or COLLECTIONS 



Pufjvnus horealis, new host : 



1806, June 11. — Four birds examined by Mr. Edwards, who re- 

 corded : " Worms very numerous." There is a considerable 

 variety in size in this lot. Some very small moniliform stro- 

 biles were noted, which subsequent examination showed to be 



