538 Dritter Abschnitt, Systematik. 



tubercles i)rotlucing only one papilla each ; and other papillae exist upoii tlie black margin , as well as on 

 the general suiface. Under surface whitiscli, edged witli black, tlie jjart auswering to the black marbled 

 line on the dorsiim being here opaque white. Head blackish, angular, raised somewhat above the general 

 plane of the body, flexible and having two projecting angles or folded tentacles.« 



Hab. »Under stones about 2 feet under water at low tide, lipon a reef of the Island of Tiabuan, 

 coast of Borneo, on August 22.« 



117. Thy.sanozoon Allmani Coli.ingwood. 

 ') C'oLLiNGWooD 1876. 116. pag. 89. Tab. 17. Fig. 2 a—c. 



1) »Length 2'/,,) inches; breadth 'Vi inch. Body transliicent, papillose. Upper surface light brown, 

 becoming darker towards the margin, and with an irregulär edgiug of opaque white all round, excepting the 

 head. An elevated ridge riins along the median line of the dorsum. The wliole iipper surface is covered 

 with clavate and pointed papillae, of a deep brown colour, and varying in size, the smallest being the 

 lightest coloured and most numerously clustered and occurring along the median ridge. Under surface grey, 

 darkening to deej) brown at the sides, and edged with opaque white. Head with two long tentacles, often 

 thrown back, and presenting the appearance of bare 's ears. Tentacles dark brown, tipped with white. Two 

 minute white tentacles are situated in front of the head, beneath the hare-like ones. Eye-spots situated in 

 a light-coloured spot immediately posterior to the head, in a double Cluster, consisting of two small crescentic 

 patches of minute black spots.« 



»Two specimens found at Singapore, west of the liarbour under pieces of dead coral on the beach 

 between tide marks Nov. 22nd.(( 



14. Genus. Pseudoceros nov. gen. 



Ex parte genera Proceros, Eurylepta auct. 



? Acanthozoon Collingwood 1876. 116. 



? Sphyngiceps Collingwood 1876. 116. 



Pseudocerideu mit spitzen oder stumpfen faltenförmigen Randtentakeln, 

 ohne Anhänge auf dem Rücken, mit einfachem oder doppeltem männlichen 

 Begattungsapparat. Keine Ausmündungen der üarmäste awi dem Rücken. 



118. Pseudoceros (mihi) velutinus Blaxchard. 

 Taf. T). Fig. 4. 



Proceros velutiiuis, ') Blanch.\rd 1847. 50. pag. 273—275. Tab. 8. Fig. 2, 2a, 2b, 2c. 

 Tab. 9. Fig. 1. — Lang 1879. 136. Anat. 



Eurylepta velutina, Diesing 1850. 56. pag. 210. — Stimpson 1857. 78. pag. 2. — 

 ScHMARDA 1859. 82. pag. 26. — Diesing 1862. 89. pag. 548. 



1) JiCette espöce est d'iine assez grande taille ; scs dimensions d'ajjrcs les individus que j'ai e.\amin6s, 

 m'ont paru varier entre 30 et 50 centimetres*j siir une largeur de 15 ä 25 environ, suivant d'ailleurs l'etat 

 de contraction ou de dilatation de l'animal. Ses teguments sont d'une mollesse extreme et les faux tenta- 

 cules, formes par un repli, semblent moins fortement prononces que dans certaines especes raugees par 



Ist wolil ein Druckfehler, soll heissen millimetres. 



