AUT. -M TAPEWORMS FEOM QUAIL AND CUCKOO — JONES 3 



the uterus at that earlier stage is somewhat spherical, while in the 

 gravid segment it is tubular and longitudinally elongate (figs. 3, 4). 

 The parauterine organ develoj)s anterior to the uterus. As is usual 

 with this structure, it first appears as a denser region of the paren- 

 chyma (figs. 5, 6) ; later there may appear in connection with this 

 area a solid mass projecting back into the developing uterus. In 

 gravid segments the parauterine organ appears as a tubular organ 

 extending from the uterus nearly to the anterior margin of the seg- 

 ment. At the point of contact there is typically a projection (or con- 

 traction) of the parauterine organ back into the uterus (fig. 4). 



The onchospheres in the uterus measure 28 to 30 /a in diameter, 

 with embryonic hooks approximately IG/* in length. No ova were 

 observed in the parauterine organ. 



SYSTEMATIC POSITION 



These specimens have the generic characters of RhabdoTnetra 

 which are as follows: Paruterininae : Scolex unarmed, without 

 rostelium. Genital pores irregularly alternate. Genital canals pass 

 between longitudinal excretory vessels. Testes posterior and lateral 

 to female glands. Uterus median, tubular, and elongate longitudi- 

 nally, or globular. A parauterine organ develops anterior to the 

 uterus and extends forward nearly to the anterior border of the 

 segment. 



Six species of Rhahdometra have been described previo'isly. One 

 species, R. similis, considered by the writer to belong in the genus 

 Paruterina, is discussed in an appended note. The accompanying 

 chart will serve to distinguish the specific characters and to compare 

 A*, odiosct with the five linown species. Based on the characters 

 shown on the chart the follovvnng Icey may be made : 



A. Genital pore posterior to middle oC segment margin. 



1. Testes few (12) R. nigropunctata. 



2. Testes numerous (about 60) 



(a) Testes posterior and lateral to female glands; cirrus pouch 

 extending beyond midline of segments; genital canals 

 dorsal to longitudinal nerve R. mimida. 



(&) Testes surrounding female glands (contrary to generic di:ig- 

 nosis) ; cirrus pouch not reaching midline of seg- 

 n^ent R. cylindrica. 



B. Genital pore anterior to middle of segment margin. 



1. Testes few (about 12 to 30) R. tomica, R. odiosa. 



2. Testes numerous (about 60) R. nullicollis. 



Distinguishing R. tomica (Kolodkovsky. 1906) from R. odiosa 

 (Leidy, 1887) is difficult. R. tomica has 20 to 30 testes "or more"; 

 R. odiosa has 12 to 25, as many as 30 never having been observed. 

 Thf) cirrus pouch of R. tomica, as estimated from drawings, is some- 



