REPORT ON THE RADIOLARIA. 1553 



Subfamily 2. CATINULIDA, Haeckel. 



Definition. C annorrhaphida with, a skeleton composed of numerous cap- 

 shaped pieces, which lie tangentially scattered on the surface of the spherical calymma. 

 Each piece is a hemispherical or flatly cap-shaped siliceous body, often with radial 

 striations, and with a thin solid wall. 



Genus 660. Catinulus, 1 n. gen. 



Definition. C annorrhaphida with a skeleton composed of solid, cap-shaped 

 or hemispherical, not fenestrated, pieces. 



The genus Catinulus differs from all the other Cannorrhaphida in the peculiar 

 shape of the numerous siliceous pieces, which are scattered on the surface of the 

 calymma and compose their rudimentary skeleton. These pieces are neither hollow 

 rings (as in the Dictyochida), nor hollow tubes (as in the Cannobelida), but solid hemi- 

 spherical caps or more flatly vaulted small dishes. All the complete specimens of this 

 genus which I observed exhibited four equal central capsules in the spherical calymma. 



1. Catinulus quadrifidus, n. sp. (PL 117, figs. 8, 8a). 



I 



Cap-shaped pieces of the skeleton flatly vaulted, three times as broad as high, smooth ; the 

 marginal ring with fine radial ribs and with smooth margin. 



Dimensions. Diameter of the calymma 0'6 to 0'8, of the four central capsules 012 to 0'2 ; 

 breadth of the concave caps 0'024, height O'OOS. 



Habitat. South Atlantic, Station 323, depth 1900 fathoms. 



2. Catinulus catillum, n. sp. 



Cap-shaped pieces of the skeleton flatly vaulted, three times as broad as high, rough, covered 

 with numerous small spinules ; the marginal ring with stout radial ribs and a corona of denticles 

 on the margin. 



Dimensions. Breadth of the concave caps 0'03, height O'Ol. 



Habitat.- South Atlantic, Station 332, depth 2200 fathoms. 



3. Catinulus lopadium, n. sp. 



Cap-shaped pieces of the skeleton hemispherical, twice as broad as high, smooth ; the marginal 

 ring smooth, slightly radiate, with thickened smooth margin. 



Dimensions. Diameter of the calymma 1'2, of the central capsule 0'22 ; breadth of the concave 

 caps 0-024, height 0'012. 



Habitat. Tropical Atlantic, Station 347, depth 2250 fathoms. 



1 Catinulus = Small cup or dish. 



(ZOOL. CHALL. EXP. PART XL. 1886.) Rr 195 



