146 0. A. aud W. G. MacOallum, 



intestine present. Length 15 mm, breadth 1,5 mm. Cyst under tlie 

 mucosa of the mouth of Sphijraena vulgaris. 



K. (D.) auxis Taschenbeeg. 



Body long- and slender, nearly rectangular, sometimes folded at 

 the margins. Neck very sharply marked out from the body, thread- 

 like. Pharynx oval. Intestine lacking-. The two individuals in a 

 cyst grow together sometimes through the union of anterior and 

 posterior body ends into a ring. Length 12 mm. In cj'sts on the 

 outside of the gill leaflets of Auxis rocJid. 



K. (D.) serrani Monticelli. 



"This new species was found on the gills of a Serrmms fim- 

 briahis from Madeira; the same imdescribed species I have frequently 

 found attached to the gills of Serranus (jigas of the Gulf of Naples. 

 At present I give only a figure of this new species to ensure its 

 recognition. The detailed description with anatomical remarks will 

 be given in a forthcoming paper. The lengths of the cysts of this 

 new species are 6 — 10 mm." 



B. serrani is the first species of this genus found in fish of the 

 family Percidae, the other known species inhabiting fishes of the 

 families ^^Scombridae and Splnjraenidae'\ ^) 



K. {D.) preUosus Ariola. 



A Single cyst found on the gills of Thynnus vidgaris contained 

 two equal individuals. Abdomen long flattened and ribbon-like, as 

 in D. sphyraenae and pelamydis. There is a quadrilateral expansion 

 at the Union of neck with the body. Mouth sucker lacking. Length 

 11 mm of which 8 mm belong to the abdomen. 



K. (D.) micropterygi Richiaedi. 



This paper was inaccessible to me but Aeiola states that tlie 

 form is identical with his Didymostoma hipartitum. 



1) Such characteristic descriptions form the source of the confuaiou 

 referred to above. No further description has appeared to niy knowledge 

 and we know nothing of this worm — not even whether it merits a 

 separate specific iiame or not. 



