64 PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



1914, June 2, — Five hundred, more or less; 100 of these larger, 



up to 34 mm. in length, maximum breadth 3.5; the others 



small, 2 to 10 mm. in length. 

 1916, October 18. — Forty-one ; from 3 to 25 mm. in length in one 



vial. In another vial, with label of same date, there were 191 



from 1 to 22 mm. in length. 

 1916, October 28. — Nine, from 5 to 15 mm. in length. 



FIMRIARIA FALCIFORMIS, new species 

 Figures 200-213 



Scolex. — Minute as compared with the pseudoscolex, diameter 

 about 0.10 mm.; suckers subcircular, diameter about 0.04; rostellum 

 moderately elongate, with a circle of 10 hooks about 0.015 mm. in 

 length. 



Pseudoscolex tapering and more or less sickel-shaped, without any 

 sharp constriction at its base, thus appearing as a curved and flat- 

 tened continuation of the strobile into which rudiments of the repro- 

 ductive organs extend for some distance. 



Strobile. — Linear with reproductive organs less crowded than in 

 F. fasciolans. Testes laterally elongated and much lobed, three in 

 number, although in some of the anterior portions of the strobile 

 there appear to be but two. Hooks on base of cirrus 0.006 mm. in 

 length, and a little coarser in appearance than in F. fascwlaris. The 

 cirrus-pouch in a series of sections of a strobile from Clangula hye- 

 malis measured about 0.30 in length and 0.036 in diameter. The base 

 of the cirrus-pouch acts as a seminal vesicle; there is also an inner 

 seminal vesicle. The vagina, at its entrance into the genital pore, is 

 lined with fine hooks; it lies on the ventral side of the cirrus-pouch 

 and leads to a seminal receptacle. Ovary and vitelline gland slender, 

 with about the same proportions and position as in F. fasciolaris. 

 The tubular uterus persists, and even in sections of maturing prog- 

 lottides was seen to lie in closely packed irregular coils in the 

 medullary space (fig. 211). There is a single layer of longitudinal 

 muscles, and there are four pairs of longitudinal excretory vessels, of 

 which the ventral have relatively thin, and the dorsal thick walls. In 

 a transverse section of an adult proglottis the largest ventral vessel 

 had the following dimensions: Diameters 0.045 by 0.033, of lumen 

 0.039 by 0.027; largest dorsal vessel, diameters 0.024 by 0.018, of 

 lumen 0.015 by 0.011. 



RECORD or COLLECTIONS 



Oidetnia deglandi: 



1913, August 14. — One hundred and forty-five, from 3 to 10 

 mm. in length; maximum breadth 1.8; all immature. Some 

 of this lot belong to the species F. fasciolaris. 



