226 



S. GOTO. 



the anterior ones overlapping the posterior portion of the ovary ; 

 ending behind at a distance from the first pair of posterior 

 suckers equal to about the length of the caudal appendage. 



Hohitat — Gill of Spinax sp. (Jap. Tsubakurozame). 



Locality — Odawara. 



Date— February 1891. 



VII. Calicotyle, Diesing. 



Tins genus was erected in 1850 by Diesing for a worm found by Kroyer on 

 the surface of the body of Ilaja radiata near the anus and afterwards described and 

 studied more minutely by Diesing') himself, HoeV) and Wierzejski'); and up 

 to the present date it has contained only a single species, Calicotyle Kroyeri, Diesing. 

 Its original diagnosis*) as given by its founder is as follows : " Corpus planum late 

 obovatum. Caput corpora continuum. Os subterminale transverse ellipticum. 

 Tractus iutestinalis bifurcatus ( ? ). Acetabulum basilare ventrale, urceiforme 

 septangulare iutus dissepimentis septem a centre radiantibus. Aperturae genitales 



infra os, approximatae. Anus Piscinm marinorum ectoparasita." This 



was emended in his "Eevision" as follows: "Corpus planum late obovatum. 

 Caput corpora continuum. Os subterminale transverse ellipticum. Acetabulum 

 unum subbasilare ventrale, urceiforme, septangulare, intus dissepimentis septam a 

 cantro radiantibus, quinque inermibus uncino valido vaginato retractili armatis. 

 Androgyna ; aperturae genitahum infra os oblique juxtaxjositae approximatae. Porus 

 exeretorius Tractus iutestinalis bicruris, coecus. — vipara. — Piscium mari- 

 norum eudo- et ectoparasita." The last remark was probably occasioned by the 

 fact that Caltcutijle Kroyeri was found by Hok in the anus as well as iu the rectum. 

 Subsequent diagnoses of the genus have baan based on that of Diesing, which 

 is no doubt in the main correct, but which I believe I can improve as follows : 



Body flat, ovate, with a median notch at the pos- 



1). Diesing— Vierzehn Arten von Bdelliden. Denkschr. d. k. Acad. d. Wiss. Wien,, Bd. 

 li, 1858. p. 63-80. Cited on Braun's authority. 



2). Hoek— Gin Calicotyle Kroyeri. Oefversigt "af. k. vet. Akad. PSrliandl, 1836. Cited 

 on the combined authority of Braun and Wierzejski. 



3). Wierzejski — Zur Kenntniss des Biues von Ca.licotyle Kroyeri Zjitsch. f. wiss. Zool., 

 Bd. 59, 1877. p. 551. 



4). Diesing— Syst. helm. p. 431 & 651. 



