142 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 39. 



Imm. 

 Fig. 5.— Mature proglottid. 



The primordia of the genital organs appear a short distance 

 back of the head. The testes, genital canals, shell-gland, and the 

 main trunk of the uterus are clearly defined in toto mounts before 



the ovaries and yolk-gland can be 

 detected. 



In the type-specimen, mounted in 

 balsam, mature proglottids measure 2 

 mm. long by 2 to 2.5 mm. wide. 



In the mature proglottids the testes 

 occur on the median side of the lateral 

 excretory canals. (See fig. 5.) There 

 are no testes in the middle line of the 

 proglottids, except at the anterior end, 

 where a band unites the two lateral 

 fields. The vas deferens 

 forms a series of involved 

 loops in passing through 

 that portion of the pro- 

 glottid where the testes are located. At the plane of 

 the ventral excretory canal, or just past it, the vas 

 deferens opens into a tubular cirrus pouch 300 to 



370 /i long and with 

 an average length just 

 between these two ex- 

 tremes, or 335 /I. The 

 diameter of the cirrus 

 pouch also varies con- 

 siderably, the maxi- 

 mum diameter noted 

 being about 110 /(. There is no 

 vesicula seminalis present. The 

 length of the cirrus varies from 418 

 to 518 /z, and the maximum diam- 

 eter noted was about 33 /n. The 

 lumen measured about 8 /i. The 

 cirrus was often found extruded 

 from the genital pore to a distance 

 of 134 to 175 fi. 



The marginal genital pores have 

 an irregular alternate arrange- 

 ment. They are especially promi- 

 nent in proglottids full of devel- 

 oping eggs. One such proglottid 1.25 mm. long has a genital pore 

 0.48 mm. in antero-posterior diameter. Such proglottids in the 

 paratype specimen are 1.25 to 1.5 mm. long by 2.5 to 3 mm. broad. 



imm. 



Fig. 6.— Gravid 

 proglottid 



shoaving un- 

 usual ute- 

 rine branch- 

 ING. 



Imm. 



Fig. 7.— Gravid proglottid. 



