454 W. N. F. WOODLAND 



described, and Diesing (6) therefore, as aforesaid, created 

 another genus — M o n o b o t h r i u m— to include the ' L i g u 1 a 

 t u b a ' of Wagener (25) and the 'Caryophyllaeus punc- 

 tulatus' of Molin. Diesing's definitions of the two genera 

 Caryophyllaeus and Monobothrium are respectively 

 as follows: 'I. Caryophyllaeus, Gmelin. Corpus con- 

 tinuum elongatum depressum, vesicula pulsatoria postica cum 

 poro excretorio. Caput dilatatum fimbriatum, bothrio ter- 

 minali trans verso bilabiato. Os . . . Collum nullum. Penis 

 lateralis conicus retractilis retro medium corporis ; apertura 

 genitalis feminea pene postposita contigua. In Piscium 

 fluviatilium praeprimis Cyprinorum intestinis. Evolutio 

 directa.' [One species C . m u t a b i 1 i s , Kud.], and ' II. M o n o - 

 b o t h r i u m , Diesing. Corpus continuum elongatum, vesicula 

 pulsatoria postica, caput sybcylindricum, bothrio terminali 

 subcirculari. Os . . . Collum nullum. Apertura genitalis unica, 

 organo musculo et femineo communis, lateralis ventralis in 

 postico corporis triente. In Cyprinorum intestinis. Evolutio 

 ignota. (Animalcula bothrii ope parieti intestini firmiter 

 adhaerent. Systema vasorum e truncis longitudinalibus 

 quatuor et vasculorum rete compositum).' [Two species : 

 M. tuba, Wagener, and M. punctulatum, Molin.] 

 Other and more recent authors, e.g. Llihe (13) and Cholod- 

 kowsky (3), group the species of the Caryophyllaeidae 

 into two genera — Caryophyllaeus and Archigetes— 

 and distinguish the former from the latter chiefly by the 

 absence of the ' caudal ' appendage in the sexual stage of the 

 former. 



Assuming the definition of the Caryophyllaeidae to 

 be that which I shall propose in the next section, I now 

 propose to divide these forms into three genera — C a r y o p h y 1 - 

 laeus, Archigetes, and Wenyonia — with the following 

 definitions : 



Caryophyllaeus, 0. F. Miiller, 1787 emend. 



The sexual apertures are situated within the last quarter 

 of the body-length, and the ovary is near the posterior 

 extremity. The longitudinal extent of the uterus is at 



