NOTES ON SOME ENTOZOA. 



By T. HARYEIY JaHNSTOIf. M.JI.. I>.So. 



(Biology Dept., University, Brisbane). 



(Plates II, III, IV, V). 



Bead before the Roy^l Society of Queensland, 2ioth June, I9I2* 



Ophiotcenia hyloe, n. sp. 



(PL II ; Figs. 1, 2). 



Host : — Hyla arurea ; specimens collected by Br. S. J . 

 Johnston, of Sydney University, from frogs captured m 

 the neighbourhood of Sydney. 



Length, over 6 cm. ; greatest breadth, about -Tdmm. 



The scolex is a rounded unarmed structure, -32 mm. 

 in width, with four suckers, each about -11 mm. in diameter,. 

 aad a rudimentary apical sucker or muscle plug. There 

 may be a slight neck- like constriction, succeeded by a 

 relatively long unsegmented region of about the same 

 breadth as the scolex. Segmentation is of the usual type 

 seen in the Proteocephalidae. The proglottids do not project 

 aterally, nor do they vary much in width after sexual 

 maturity has V)een reached. The genital pores are situated 

 at about the middle of the segments and alternate irregu- 

 l arly . 



The muscular, nervous and excretory systems are of 

 the general Proteocephalid type. The testes consist of 

 numerous vesicles of about -03 mm. diameter, arranged 

 dorsally in two wide lateral fields between which lies the 

 uterus. These fields extend almost from the anterior 

 border of the segment to the ovary. The vas deferens 

 may be recognised as a coiled tube in the middle of the 

 proglottis, lying above the uterus and passing laterally 

 n close coils above and parallel to the vagina until it entera 

 the cirrus sac within which the vas becomes thrown into 



