BY T. HARVEY JOHNSTOK AND 0. W. TIEGS. 99 



testine and are perhaps digestive glands. A few simple glands are also present 

 in the walls of the pharynx. 



Situated laterally to and just behind the phai-ynx are two masses of glands, 

 whose ducts run forward and inwai-d to terminate in three pairs of head-organs. 

 The exeretorj' system could not be recognised. Of the nervous system, only the 

 brain could be seen, lying between the eyes. The latter are situated immediately 

 below the epidermis. 



The testis is a large organ, posterior to, and partly enveloping, the ovary. 

 The vas deferens is a thin-waUed tube with a rather wide lumen even when 

 emipty. It is capable of immense distension and may act as a large vesicula 

 seminalis. with lobed walls, occupying a considerable part of the dorsal region 

 of *he woi-m. Anteriorly it becomes continuous with a large ejaculatory bulb 

 opening into the cirrus by an ejaculatory duet. The latter is a very long thin 

 tube which passes first backward, then, bending upon itself, runs forward and 

 inward towards the midline where it enters the cirrus. The latter is a simple 

 chitinous tube which passes vertically downwards, and is retractile into the 

 cirrus-sac, in which it may generally be seen coiled up. 



The ovary is a large rounded structure, immediately in front of the testis; 

 from its anterior end the o\'iduct travels vertically downward and into it the 

 vagina opens. Into the latter, immediately before it communicates with the 

 oviduct, there enters the vitelline duet. The oviduct then travels forward as a 

 wide tube to terminate immediately behind the male aperture. The shell-gland 

 is represented by a simple glandular thickening of the wall of the oviduct. The 

 vagina is a naiTow tube passing straight to the left side of the animal, where 

 it opens in the region of the body constriction on a small bulbous expansion. 

 It is provided, in its anterior portion, with a large thick-walled receptaculum 

 seminis. The yolk system is well developed, but confined to the anterior two- 

 thirds of the body, where it lies in close relation with the intestine. In the 

 region of the body constriction a pair of transverse yolk-duets is formed 

 which open into an ill-defined yolk-reservoir. 



The egg is oval, .048 mm. in length and .024 mm. in breadth, and bears 

 at its posterior end a short blunt spine (PL xii., fig. 17). 



The species was found, sometimes in large numbers, on the gills of Therapon 

 carho Ogilby and McCulloch, from the Thomson Eiver, at Longreaeh, Central 

 Queensland. 



Daitreosojia bancrofti, n.sp. (Plate xiii., figs. 21, 22.) 



This species closely resembles D. constrictmn, but differs from it in the 

 following characters : — 



It is a slightly larger worm, measuring, when full grown, .56 mm. Lu length", 

 .19 mm. in greatest breadth. The head is not regularly rounded as in that 

 species, but is sharply indented immediately in front of the mouth (PI. xiii., 

 fig. 22). The four head-organs are close together, the last not so distinctly 

 separated from the others as in the foregoing species. 



The vesicula seminalis is quite different from that of B. constrictum. It 

 lies only on the left side of the body (PI xiii., fig. 21) and does not undergo 

 the great dilatation characteristic of that species, but appears as a tube bent 

 sUghtly upon itself anteriorly, only moderately distended, and distinctly lobed 

 only on its outer wall. 



The vagina does not tei-minate in a small rounded bulb, but possesses a 

 narrow fimnel-shaped opening lying on the left side, within the body constriction. 



