K. KISHrNOUE, DESCRIPTTON OF MASTIGIAS PHYSOPHORA. 87 



2 smaller and triangular ocular flaps (Figs. 1, 2). Exnmbrella is finely 

 granulated. As regards tlie snbumb'rella there is nothing to be specially 

 described. We see fine muscular ridges l)etvveen the adradial canals, running 

 parallel to the umbrella margin (Fig. 2). 



Oral pillar is thick, as broad as its length. Its cross-section is nearly 

 lanceolate in outline. Subgenital ostia between two oral pillars are ellip- 

 soidal, twice as broad as the oral pillar (Fig. 1). 



Oral disc is thick and quadrate. Its upper surface is flat and smooth 

 (Fig. 3), while the under surface has the crisp of the oral cross. Each limb 

 of the cross is bifurcated, thus it is connected to the ventral crisps of the oral 

 arms. Numerous club-shaped vesicles are seen between mouth crisps (Fig. 4). 

 As each perradial side of the disc there is a round excavation (Fig. ]). 



Oral arms (without appendage) are almost equal in length to the radius 

 of the umbrella. The upper arm is short, nearly half in length to that of the 

 under arm. The lower arm is 3-winged, and these 8-wings carry suctorial 

 crisps (Figs. 1 , 5, 0). Between these crisps there are many vesicles. The 

 vesicle is conical in shape, attached with its apex. It may be considered as a 

 funnel crisp with its mouth closed and its oral tentacles degenerated (Fig. 13). 

 At the distal end of each arm there is a three-cornered, club-shaped appendage, 

 the surface of which is somewhat rugose (Fig. 1). 



The central stomach cavity is cruciform. Of the radial canals 4 

 perradial, and 4 interradial, canals only are straight and most significant. 

 Between each two of these straight canals there are about seven radial canals 

 (Fig. 2). They anatomose with :each other. The mesh of the network is 

 oblong. The extra-circular canal system is very finely meshed and the mesh 

 is polygonal. Each of the 4 strong pillar canals divide into 3 branches, 2 

 lateral and 1 median. The lateral branches are for the 8 adradial arms, while 

 the median branches meet at the centre of the oral disc and form the central 

 cruciform canal (Fig. 3). The latter is connected with the arm-canals by 

 short canals. Thus the canal-system of the^oral disc is exactly the same as 

 that of Phyllorliiza pinictata. .Each arm canal Js divided into 4 at the 

 juncture (not exactly at a common point) of the upper and under arms (Figs. 

 5, G). They are 1 central, 1 axial and 2 abaxial. The three latter canals run 



