BY T. HARVEY- JOHNSTON AND 0. W. TIEGS. 101 



approximately 'equal distances apart. The posterior pair lies above the pharynx, 

 the anterior pair immediately anterior to that organ. Connected with the 

 posterior pair is a definite globular vesicle. 



The large testis lies immediately anterior to the end of the intestine and 

 in section appears wedge-shaped. The vas deferens is a short wide tube opening 

 into the large vesieula seminalis. The cirrus is a simple slightly curved chitinous 

 tube. No other male sexual organs appear to be present. 



The small ovary is situated anteriorly to the testis and somewhat trans- 

 verseily. The o^dduct is given off from its ventral portion and runs forward 

 close below the vesicula seminalis. A vagina is absent. 



The shell-glands appear to be simple glandular thickenings of the uterus. 

 The female opening is situated immediately behind the male aperture in the 

 median ventral line. No eggs were present in any of the specimens examined. 

 The yollc system is strongly d^'eloped but is confined to the anterior region 

 of the animal. The transverse yolk-ducts lie immediately in front of the ovary. 

 No reservoir was visible. 



Found on the gills of Therapon imicolor Giinther, from the Burnett River, 

 South Queensland. 



14. T E T R A N c I s T R u M Goto and Kikuehi, 1917. 



Rather small Tetraonchinae measuring 1.2 to 2 mm. in length. Body dilated 

 in middle. Disc not sharply marked off from body and devoid of minor hooks. 

 Eyes absent. Pharynx elongated; intestine bilobed, provided with caeca, the 

 limbs communicating behind. Testis and ovary situated about the middle of the 

 body. Penis simple, witli accessory chitin-piece attached. Vagina present. 



From the gills of a marine fish of genus Sigamis. From Japan. 



Type and only known species, T. sigani Goto and Kikuehi, 1917. 



Subfamily III. LEPIDOPTREMINAE, n-subfam. 



These are Gyroda-ctylidae, which have, as a common characteristic, the de- 

 velopment of scale-like papillae over the greater part of the body except in 

 Lamella discus. On the disc these papillae are an-aaged in the foi-m of a pair 

 of scaly sucker-like organs (for which the name SquamodAsc is proposed) which 

 may or may not be provided with accessory hooks. Four powerful hooks, with 

 basal supporting apparatus are present; also numerous minute hooks. 



Two pairs of eyes. Intestine forked, ending blindly, not lobed. Ovary and 

 testis solid. Penis simple or vei-y complex. Vagina present. 



From the gills of freshwater and marine fishes in Queensland. 



This subfamily includes the following neiw genera: — Lepidotrema (type 

 genus), with a subgenus Flabellodiscus; Lepidotes; Em pleuro discus; Acleotrema; 

 Lam.ello discus. 



Key to Genera of Lepidotreminae. 



A. a. "iSquamodisc" provided with accessory hooks . . . D. 



b. "Squamodisd" devoid of such hooks B. 



B. a. Body covered witih scaly papillae; each of the concentric ridges of 



"squamodisc" consisting of numerous scales C. 



b. Body devoid of scaly papillae; concentric ridges consisting of only two 

 very broad lamellae Lamellodiscus. 



C. a. Cirrus-sac very highly developed; very large genital chamber present .. .. 



Acleotrema. 

 b. Cirrus-sac simple, genital chamber not markedly developed . . . . Lepidotes. 



