Parasites of marine and migratory sturgeon-types (Acipenseri- 

 formes, nobis). ' 



Type and only genus, Nitzschia Baer, 1827. 



In addition to the characteristics enumerated above, a charac- 

 teristic for the subfamily is the location of all the sex openings on the 

 ventral side behind the pharynx and in front of the ovary in the middle 

 field between the branches of the intestine. The attaching disc is the same 

 as among Entobdellidae (sic), it is deprived of all traces of septa and has 

 a growth border which usually does not even form any noticeable folds. 



Addition to the Family 



Ancyrocotyle Parona and Monticelli, 1903 



(Fig. 283) 



This genus, which until the present time was attributed to 

 Benedeniinae, contains only one species- -A. vallei (Parona and Perugia, 



1895) parasitizing Naucrates ductor (L. ) 

 and found only twice --near Trieste 

 (collection of Parona and Perugia) 

 according to the data of Palombi (Palombi 

 1924c, 1949), and in the regions of the 

 Antilles (material of Price--described 

 under the nanne of A. bartschi Price, 

 1934). According to the descriptions of 

 the authors, this species is characterized 

 by the absence of septa on the disc, by 3 

 pairs of middle hooks, the presence of 

 unbranching intestinal branches which 

 end blindly, by the simple round ovary, 

 2 testes and weakly developed sex ducts 

 of the usual type (Fig. 283). Attention is 

 drawn to the weak development of the 

 vitellaria of both individuals which were 

 in the hands of Palombi. Apparently he p. 383 

 possessed immature specimens just as 

 did Price, who stated directly that both 

 of his individuals were immature. Hence, 

 it is more likely that the authors were 

 dealing with stages of development of some 

 Capsalidae and that the independence of 

 this genus demands substantiation. To 

 ascribe this "genus" to Entobdellinae because of the absence of the septa 



Fig. 283. Ancyrocotyle vallei 

 (Parona and Perugia), general 

 aspect of the worm. Enlarged 

 30 times. (According to 

 Polombi, 1942). 



457 



