218 S. J. JOHNSTON. 



the intestinal limbs right to their posterior end. They do- 

 not extend inwards beyond the intestine to any appreciable 

 extent, and remain separated behind. 



The uterus is very thin-walled and occupies the middle 

 field behind the testes almost reaching the posterior end 

 of the intestine. One coil runs between the testes on the 

 dorsal side, and between the testes and the ovary. 



The eggs are comparatively numerous and quite small, 

 the average size being 0*032 x 0*019 mm., while the 

 smallest measured 0*0304 x 3*017 mm., and the largest 

 0*033 x 0*022 mm. 



Plaglorchis clelandl is more closely related to P. macu- 

 losus, Rud., parasitic in the European swallow, Hirundo, 

 than to the other species of the genus. It differs from this 

 species' mainly in the arrangement of the fields of the yolk- 

 glands, which in Australian species never extend as far 

 forwards as the fork of the intestine, indeed only reach a 

 level half-way between the ventral sucker and the pharynx, 

 and which always remain separate in the posterior region* 

 The eggs in the Australian form are smaller than those of 

 the European. 



P. clelandl differs from the other Australian species of 

 the same genus P. spatulatus, mihi. and P. (Lepoderma) 

 nlsbetii, Nicoll, (38) in a number of points such as the very 

 closely placed gonads, but especially in the extent of the 

 yolk-gland fields which extend further forward in the two 

 last named species and in P. spatulatus in addition are more 

 lateral in front of the testes and extend further in towards 

 the middle behind them. 



Dolichosaccus solecartus, sp. n. (Fig. 12.) 

 Diagnosis. — A minute worm, cylindrical in form, with 

 large suckers. Ratio of oral to ventral sucker 3 : 2. In- 

 tegument spiny, except at the posterior end. Prepharynx, 



