124 NEW GYEODACTTLOID TREMATODES PEOJI AUSTRALIAN FISHES, 



the account given by the latter it seems possible that the species dealt with is 

 a member of the Gyrodactyloidea, with affinities towards Dionchus. 



St. Remy and also Perrier regarded it as belonging to the Udonellidae. 

 MonticelU placed it in the Calceostomdnae (1892) but at a later date (1905) con- 

 sidered it as in no way related to Calceostoma and placed it in the Monocotylidae, 

 forming with Lophocotyle, Merizocotyle, Dionchus and Lintonia the subfamily 

 Anisocotylinae, to which reference has already been made. Pratt included it 

 amongst the Gyrodaetylidae. The insufficient descriptions published prevent us 

 from being able to classify the genus definitely. 



It is apparently to be diag-nosed as follows: — Body fairly elongate, anterior 

 end sub-truncate; cephalic glands present (?), opening to anterior end by 

 numerous scattered apertures. Disc not sharply marked off; devoid of hooks. 

 Eyes absent. Intestine not bifurcated ; extending to posterior end of animal. 

 Testis and ovary in anterior portion of body; single and not lobed. Penis simple. 

 Vagina absent. 



From the giUs of a sea bream, Payrus orphus (Mediterranean). 

 Type and only known species, A. richidrdii Sonsino, 1890. 

 V. Appendix to Gyrodactyloidea. 

 Subfamily I. ACA.^THOCOTYLINAE Montic, 1903. 

 34. A c A N T H o c T T L e Monticelli, 1888. 

 Small or medium-sized trematodes in which the posterior disc is provided 

 with numerous radiating rows of minute hooks; two larger hooks, or a small 

 terminal accessory disc bearing minor hooks may be present. Anterior end pro- 

 vided with head-organs into which unicellular glands open; or (apparently) 

 with several small suckers. Intestine bilobed, devoid of caeca. Eyes present or 

 absent. Testis very extensive and in the form of numerous small follicles. 

 Vagina apparently present. Ovary simple, unbranched. Yolk system very ex- 

 tensive. Parasitic on the skin of rays. 



Type s p e c i e s, J., lobianchi Monticelli, 1888. 



Known species: A. lohiancM Montic, 1888; A. uligotera Montic, 1899; A. 

 elegans Montic, 1890; A. comcinna Scott, 1902; A. monticellii Scott, 1902; A. 

 verrilli Goto, 1899; A. branohialis Willem, 1906 and A. bothi MacCallum, ]913. 

 A species which MacCallum (1916) described as A. raiae is clearly not a member 

 of this genus; no head-organs are mentioned: it appears to be a member of the 

 MerizocotyUnae and has been referred to under Empruthotrema. 



The affinities of this genus are doubtful. Both Monticelli and MacCallum 

 gave an account of species in which they mention the presence of oral suckers. 

 Goto (1899) described A. verrilli as having cephalic glands opening on the head 

 in the typical Gyrodactylid manner and as a result of his examination of some 

 specimens of Monticelli's A. lobianchi, stated that what this author took for oral 

 suckers were in reality the openings of glands, similar to those occun'ing in A. 

 verrilli. Monticelli (1890, 1899) also described two other forms, A. oUgoterus 

 and A. elegans, which Goto did not re-examine. MacCallum (1913, 1917) de- 

 scribed another form A. bothi from the United States, in which he saw four pairs 

 of oral suckers which he calls tactile areas in his figure (1917, fig. 27), and 

 actually noticed the worms attaching themselves by these alone. He does not, 

 however, state whether glands open into these organs or not. MacCallum (1916, 

 p. 23) regards the genus as belonging to the Gyrodaetylidae, while Monticelli 

 considers it as a member of the Tristomidme (1888) AcanthocotyUnae (Montic, 

 1903). Until the other species are more fully described it will not be possible 



