68 



MuNTHE recorded ^) it (also under the name of Pneitinoderinon inacrocotyhiin) from 

 "Javasjön" (von Schéele, 1885). Notwithstanding its occurrence in the East-Indian Archipelago 

 has been ascertained, the Siboga Expedition did not succeed in collecting it. 



Many authors have confounded this species with the foregoing one. Indeed, the confusion 

 in the exact discrimination of Pu. pcroni, vicdUerraneuni and violaccum existed up to the time 

 of BoAS and Pelseneer. 



3. Pnciunonoderiim hctcrocotyhtiii n. sp. (PI. V, figs. 118 — 119). 



Stat. 143. i°4'.5 S., i27°52'.6E. i spec. 



Body: Strongly contracted ; it seems, however, rather short. Foot of moderate length. 



L a t e r a 1 g i 1 1 : short, with fringed lateral somatic crest. 



Posterior gill: dorsai and ventral side of the quadrangular crest fringed ; radiating crests 

 well developed, each of them bearing on either side five or six fringes, which are subdivided. 



Buccal appendages: small with a great many suckers, distributed in the following 

 manner : on either side of the base is situated a bundie consisting of about seventy-five very 

 small suckers. In the middle of the acetabuliferous appendage about thirty suckers on very long 

 peduncles are inserted. The shape of these suckers is very peculiar, as they are much elongated, 

 with thin walls. This whole group somewhat resembles a colony of Vortkclla or Epistylis. 



Hook-sacs: strongly developed, the inner sac reaches only half the length of the 

 outer one. About twenty strong hooks, strongly bent. 



R a d u 1 a : not investigated. 



Colour: yellowish, head dark (spirit-specimen). 



Length: 5 mm. 



4. Pnciiiiionodernia pyginaciim n. sp. (PI. V, figs. 120 — 122). 



Living animals: 



Stat. 141. i°o'.4S., I27°25'.3E. i spec. (young). 



Stat. 144. Damar Islaiid. i spec. 



Stat. 165. Daram Island. i spec. 



Body: short. Foot rather large, not tapering. 



Lateral gill: very small, with fringed lateral somatic crests. 



Posterior giH: Dorsai and ventral side of the quadrangular crest fringed ; each 

 radiating crest bears on its median side two very small fringes, not subdivided. 



Buccal appendages: short with about eight suckers; the size of which does not 

 increase from the base to the distal extremity. It is very difificult, even in microscopical 

 examination, to make out the exact number of the suckers, the whole animal scarcely 

 measuring 3 mm. 



Hook-sacs: very much developed, extending as far as the posterior extremity of the 

 body. About forty large hooks in each sac. 



l) Pteropoder i Ups. Univ. Zool. Mus., Bih. till K. Svensk. Vet. Akad. Handl., Kd. 13, afd. IV, n» 2, p. 32. 



