TYPHS OF SPECIES OF CKSTODA — KREFFT. 29 



World. Consequently, a new specific name, australieiisis, was 

 suggested by me 65 as the two parasites are distinct. It was also 

 mentioned that the worm appeared to be a Dilepis. It is really 

 a Gyroccelia, my error arising from the fact that in the jar 

 containing the type specimen, there were present a number of 

 fragments of a species of Diorchis, whose possession of unilateral 

 genitalia and sac-like uterus led me to regard it as a Dilepis. 

 Further examination of the latter showed it to be a typical 

 Diorchis, viz. D.jiavescens (syn. T. jlavescens, KreflTt) found in 

 various ducks, the specimens evidently having been placed by 

 mistake into the same receptacle as those from the Stilt. Dried 

 fragments of Gyrocodia australiensis were also found amongst 

 the type material of Tceuia rugosa, Krefft, i.e. Acoleus hedleyi, 

 mihi. 



Krefft's account is very unsatisfactory. He mentioned that 

 the total length of the strobila was three and a half inches, the 

 anterior fourth being thin and tapering, and that the scolex 

 possess-ed four large suckers and a short rpstellum. The rest of 

 his information is of no value. There is only a scolex-less 

 fragment in the Museum collection. Sexually mature segments 

 are about - 37 mm. in length by 0-89 mm. in breadth, the ratio 

 being 2 : 5. In those proglottids in which the uterus has assumed 

 its final form the length (O0G0 mm.) is much shorter and the 

 breadth (0296 mm.) rather greater, the ratio being 1 : 5. The 

 amount of overlapping is not very great. 



Body-wall, Musculature, etc. — The state of preservation did 

 not allow of any details being given regarding the subcuticular 

 structures. The cuticle is quite thin. The parenchyma muscu- 

 lature is very peculiar and resembles in general type that found 

 in other members of the Acoleidse, one of which A. hedleyi has 

 already been referred to. The longitudinal bundles are very 

 powerful, consisting of two well-marked concentric series, the 

 bundles of the outer possessing from twenty to thirty fibres, 

 while those of the inner series have from twenty to fifty. The 

 bundles become much smaller laterally but the rings do not 

 become broken. The trausverse musculature is quite typical for 

 the genus. The outermost series is very well developed. The 

 middle series, which lies between the two longitudinal rings is 

 also well-marked though not so powerful as the outer. The 

 inmost series is quite weak and was seen only in a few of the 

 sections. Dorso-ventral fibres are easily recognis-ed. 



« s Johnston— Journ. Roy. Soc. N. S. Wales, xliv., 1910, p. 95. 



