548 Dritter Abschnitt. Systematik. 



circular Cluster, difficult to detect owing to tlie dark colour of the animal, and situated upon a lidge foimed 

 by the elevation of the antennal head. Under a stone and upon a small grey incrusting sponge, between 

 tide-marks in Siugapoie Harbour, west of the town, December 3">.(( 



133. Pseudoceros (mihi) ? lacteus Collingwood. 



Sphyngiceps lacteus'), Collingwood nov. gen. spec. unica. 1876. 116. i)ag. 90. Tab. 17. 

 Fig. 3 a. b. 



1) Gattungsdiagnose: »Corpus laeve, caput discretum, tentaculis magnis subdistantibus ; ocelli occi- 

 pitales et capitales.« 



Speciesdiagnose : »Length '/lo inch, breadth '/4 inch. Body graceful in form, semitransparent. Upper 

 surface cream-coloured, irregularly sjjotted with sparse and niinute black dots, and having faint marbling 

 on eithcr side of the median ridge, which is very conspicuous. Margin irregularly blotched with red, and 

 the whole body edged with a narrow black line. Under surface whitish, edged with red blotches and a 

 black streak as on the upper side, but somewhat less distinct. A broad streak of white occupies the anterior 

 third of the median line. Head sraall and narrow, but rendered very conspicuous at times by its being raised 

 up, so that the median ridge is thus very much elevated in front. Head furnished with two folded tentacles. 

 Eye-spots round, immediately posterior to the head, which has in front of it a pair of larger single spots. 



— One specimen found under a coral block, west of Singapore Harbour, at low water, on Nov. 22"'^.« 



15. Genus. Yungia nov. gen. 



Pseudoceriden mit typischen, falt enförmigen Randtentakeln, ohne Zotten 

 auf dem Rücken, mit einfachem männlichen Begattungsapparat. Das System 

 der Darmäste mündet vermittelst zahlreicher Diverticvila durch kleine Oeff- 

 nungen an der Rückseite des Körpers nach aussen avis. 



134. Yungia (mihi) aurantiaca Delle Chiaje, 

 Taf. 5. Fig. 1. 



Planaria aurantiaca, Delle Chiaje 1822. 21. Tab. LXXVIII. Fig. 1 u. 13. Ohne Text. 



— ') 1841. 36. Vol. III. pag. 131. 132. Vol. V. pag. 111. 112. Tab. 39. Fig. 1. 13. Tab. 109. 

 Fig. 19. 23. 24. — PI. flava? Vol. V. pag. 112. Tab. 36. Fig. 11. — Guerin-Meneville 1844. 

 37. Tab. XI. Fig. 3. — ') Verany 1846. 48. pag. 9. — Milne-Edwards 1859. 83. pag. 455 

 —456. — Lang 1881. 149. (Anat., Copul.) — 1881. 150. (Anat.) 



Planaria flava, Delle Chl\je 1822. 21. Tab. CVIII. Fig. 11. Ohne Text. 



Thysanozoon aurantiacum, Oersted 1844. 39. pag. 47. — ^) Diesing 1850. 56. pag. 214 

 —215. — 1862. 89. pag. 558. 



Thysanozoon flavum, Oersted 1844. 39. pag. 47. — Diesing 1850. 56. pag. 214. — 

 1862. 89. pag. 558. 



Proceros aurantiacus, Lang 1879. 136 (Anat.). — Schmidtlein 1880. 137. pag. 172 

 Zeit der Eiablage. — Lang 1881. 145. pag. 87 (Copulation) . 



1) »Corpo ellittico, piano, laminoso, nella superiore faccia rosso-niiniaceo puntinato di bianco con 

 linea di simile colorito nel margine ondeggiante ; un gruppo di macchiette nere oculari alla basa de' rialti 



