214 Dr. Hubreclit on a new Species o/"Coris. 



Fig. 17. Siliceous spouge-spicules characteristic of a Pachustrella growing 

 over some of the groups of Polytrema utriculare — Pachastrella 

 parasitica, n. sp. : a, skeleton-spicule spreading into a head 

 40-GOOOths inch in diameter ; 6, flesh-spicule, 5-6000ths inch 

 long. 



Fig. 18. Polytrema planum, n. sp., nat. size, on a branch of coral : a, coral ; 

 h, Polytrema ; c, its aperture ; d, group of Planorhulina vulgaris. 



Fig. 19. The same, diagram of a few of the chambers, magnified, to show 

 their variety in form, also foramination and stoloniferous inter- 

 communications. 



XX. — On a new Species of Oox'is, from the Molucca Archi- 

 pelago. By Dr. A. A. \V. Hubrecht, Conservator at the 

 Lejden Museum. 



This species (a specimen of which was among a collection 

 of fishes from the island of Ceram, sent by Mr. Liideking) 

 maj be distinguished at a glance irora any of the known 

 species of the genus by the oblong transverse pearl-coloured 

 spot which descends from between the fourth and seventh 

 dorsal rays. Another feature by which it may be easily distin- 

 guished is the (apparently) blue band running from the lips 

 along the throat to the ventrals. The back is crossed by 

 numerous transverse bands, darker than the ground-colour, 

 broader than the interspaces, and not continued on the belly. 

 The lower half of the dorsal fin is dark-coloured, the upper 

 half light ; both it and the anal fin have a thin dark-coloured 

 streak running close along the outer margin. 



I have named it after Dr. Bleeker, who has introduced into 

 science such a considerable number of new fishes from the 

 archipelago already. 



Coris Bleekeri^ sp. nov. 

 D. 2 + jV a. 3 112. C.l|12|l. P. 2 I 11. V. 1 [ 5. 



C. corpora oblongo compresso, altitudine 4 circiter in ejus longitu- 

 dine, latitudiue 21 ad 2|- circiter in ejus altitudine, capita acutius- 

 culo 4 ad 4^ circiter iu longitudine corporis ; altitudina capitis \t 

 circiter in ejus longitudine ; oculi diametro 5| fere ad 6 in longitu- 

 dine capitis; ocuhs diametro Ig di-stantibus, diametro g ad | a linea 

 rostro-frontali remotis, linea rostro-frontali declivi convexiuscula 

 vel rectiuscula ; labiis carnosis ; maxillis subiequalibus, superiore 

 ante oculum desinanta 4| circiter in longitudine capitis ; dentibus 

 maxillaribus biseriatis, intracristalibus grauiformibus minimis, cris- 

 talibus conicis acutis, auticis 2 caninis mediocribiis curvatis promi- 

 nentibus ; angulo oris dente prominente nullo ; squamis lateribus 

 76 circiter in linea latei*ali ab.sque caudalibus minimis : linea 



