450 G. M. R. Levinsen. 



is covered with small, nai'row linear projections, which in the frontal 

 surface are directed towards the mucro and in the ooecium towards 

 the middle of the proximal margin. In various places of the circum- 

 ference the frontal surface is provided with 1 — 3 series of marginal 

 pores. The ancestrula which together with a number of surrounding 

 zooecia possesses 6( — 5) oral spines has a similar structure like the 

 other zooecia. 



This species has been found on algæ and stones, and especially 

 on stones it appears as large extensions. 



St. 63, Stormbugt, 20— 40 m. 



St. 69, Stormbugt, 20-30 m. 



St. 71a, off Cape Bismarck, 30—40 m. 



Escharella indivisa n. sp. 



(PI. XX, figs. 1, 2). 



The zooecia which have a more or less regular, hexagonally 

 rhombic form are very convex, finely granular, and surrounded by 

 a single, distally sometimes double row of small marginal pores. 

 The aperture, which is almost twice as broad as high and provided 

 with a rather low, but distinct oral arch, may be surrounded by 

 6 spines, but in most zooecia the two median ones are absent, and 

 this is always the case in the ooeciferous zooecia. The suboral 

 peristome is provided with a very broad, flattened, triangularly roun- 

 ded or trapeziform not pointed rostrum, and within this is seen a 

 large, vertically projecting ver}^ broad, but rather low median tooth 

 with a straight or even a little convex margin, and on each side, 

 as a rule, with a very small tooth-shaped projection. The large, 

 semi-globularly convex balloon-shaped ooecia, which from the 

 proximal margin increase in breadth towards the middle, and here 

 not rarely are about twice as broad as high, are provided with a 

 depressed, somewhat everted marginal portion, which is a little pro- 

 tracted in the form of a small shade. In the other species of this 

 genus examined by me, each of the three original elongate pore- 

 chambers is divided by transverse septa into a number of small 

 uniporous chambers. In this species, on the contrary, only the 

 distal wall is divided in this way (as a rule only into a small median 

 and two larger lateral chambers) while the lateral ones are undiAÙded. 



The ancestrula is provided with 9 spines, four of which surround 

 the aperture, while the 5 others surround a somewhat depressed 

 cryptocyst. The aperture is provided with a concave proximal margin. 



St. 71a, off Cape Bismarck, 30— 40 m. 



St. 72, Danmarks Havn, 10 — 15 m. 



