204 



of a yellow chitinous mass, of which the proximal one serves as a connection 

 with the respective zocecium and the other as a connection with the gonozocecium. 

 The central part has in the distal half of its less strongly arched frontal surface, 

 which is turned towards the colony, rather a deep, oval cryptocyst depression, 

 which is in its proximal part perforated by a round hole, and in its inner lumen 

 we may distinguish between two narrower terminal portions, which are continued 

 through the two chitinized terminal pieces, and a broader central portion, divided 

 into two spaces by the somewhat oblique distal wall, the basal part of which 

 has three single-pored rosette-plates (3o), and which meets the gymnocyst im- 

 mediately on the distal side of the above-mentioned pore. In the possession of 

 an oval cryptocyst depression, perforated by a pore, the kenozooecium answers 

 to the stem-joints in Chlidonia. 



Together with the appertaining ooecium the gonozooecium (3 a, 3 h, 3 c) 

 forms an elongated, rounded, somewhat compressed body, which is to a certain 

 extent like a bean and the most arched part of which is turned away from the 

 colony. The larger distal and more rounded half of this body is represented by 

 the ooecium, formed by two arched, bilaminar valves (3 h, 3 1), the free margins 

 of which meet and enclose a wide, hollow space. If these two valves are opened 

 out from each other (3 h) it will be seen that they cover the whole of the distal 

 cryptocyst-bearing part of the gonozooecium, which latter differs from an ordinary 

 zocecium in several respects. While the zooecium may most properly be called 

 rather flattened, the gonozooecium is despite its strongly arched gymnocyst some- 

 what compressed and seen from the side of a rounded, triangular outline (3 a, 3 k), 

 with the two, somewhat outcurved sides of the triangle meeting in an acute- angle 

 pointing towards the kenozooecium. While in an ordinary zooecium the crypto- 

 cyst-bearing part forms an obtuse angle witk the proximal part consisting of the 

 gymnocyst, this angle is almost a right angle in the gonozooecium (fig. 3 k). The 

 aperture is a little larger than in an ordinary zooecium, and as the gonozocecium 

 seems to be quite symmetrical the two opesiulse (fig. 3 e) are almost of the same 

 size, and the above mentioned glistening stria on the proximal side of them is 

 not inclined towards one side. The principal difference is however the absence 

 of the two horns, the space for which is occupied by the two ooecial valves. If 

 these be removed a lengthy, oval opening is found on either side in the margin 

 of the gonozooecium, and the margins of this opening are continued proximally 

 and distally into the raised line surrounding the depressed frontal area. The 

 distal pore-chamber ends in a small, round opening surrounded by a chitinized 

 margin, and one of the cylindrical internodes mentioned on an earlier occasion 

 may have had its place here. 



