REPORT ON THE RADIOLARIA. 1217 



The genus Callimitra, and the two following nearly allied genera, Clathromitra and 

 Clathrocorys, form together a peculiar small group, the Callimitrida, living in the 

 Central Pacific, and differing from the other Sethopilida in some remarkable points, 

 derived perhaps directly from the Archiscenida, Archiscenium and Pteroscenium, by 

 the development of thoracic network between the three cortinar feet. In the centre of 

 the collar septum, where these feet are united, there arises a vertical free columella, 

 prolonged over the top of the cephalis as a free horn, and this horn is connected with 

 the three thoracic ribs by three vertical fenestrated wings. 



1. Callimitra carolotce, n. sp. (PL 63, figs. 1, 7, 8). 



Cephalis campanulate, conical, with irregular, polygonal pores, and a thin bristle-shaped apical 

 horn of the same length. Length of the two joints = 3:6, breadth = 2 : 6. Thorax in the upper 

 half with irregular network, in the lower half with parallel transverse bars ; in each of its three 

 sides descend two convergent pairs of stronger, parallel, curved ribs, not confluent at the peristome. 

 Each of the three vertical wings with eight stronger ribs, three arising from the cephalis, five from 

 each foot. Dedicated to my dear mother Charlotte Sethe. 



Dimensions. Cephalis 0'07 long, 0'05 broad; thorax 015 long, 0'15 broad. 



Habitat. Central Pacific, Station 270, depth 2925 fathoms. 



2. Callimitra annce, n. sp. (PI. 63, fig. 2). 



Cephalis campanulate, conical, with irregular, polygonal pores, and a thin bristle-shaped horn of 

 the same length. Length of the two joints = 1:2, breadth = 1:3. Thor&x nearly in its whole 

 extent with parallel transverse bars, which are crossed by two convergent systems of parallel 

 beams ; in each of its three sides descend four convergent pairs of stronger, parallel, curved ribs, not 

 confluent at the peristome. Each of the three vertical wings with six stronger ribs, three arising 

 from the cephalis, three from each foot. Dedicated to my dear first wife Anna Sethe. 



Dimensions. Cephalis 0'05 long, 0'05 broad ; thorax 0'12 long, 0'18 broad. 



Habitat. Central Pacific, Station 271, depth 2425 fathoms. 



3. Callimitra agnescs, n. sp. (PI. 63, fig. 5). 



Cephalis pear-shaped, with irregular, scpuare pores, and a slender bristle-shaped horn twice 

 as long. Length of the two joints = 1:3, breadth = 1:5. Thorax in its whole extent with 

 parallel transverse bars, which are crossed by two converging and crossed systems of parallel 

 beams ; in each of its three sides descend five convergent pairs of stronger, parallel, curved ribs, the 

 two or three upper of which are crossed at the peristome. Each of the three vertical wings with 

 five stronger ribs, three arising from the cephalis and the horn, two from each foot. Dedicated to 

 my dear second wife Agnes Huschke. 



Dimensions. Cephalis 0'05 long, 0'05 broad; thorax 0'15 long, 0'22 broad. 



Habitat. Central Pacific, Station 273, depth 2350 fathoms. 



(ZOOL. CHALL. EXP. PART XL. 1880.) Rr 153 



