REPORT ON THE RADIOLARIA. 1747 



are placed nearly in one plane and form a hand. The form of the fingers is very variable 

 and most characteristic of the individual species. Very often they have the shape of a 

 human finger, and are smooth, spinulate, or armed with recurved hooks. The distal end 

 of each finger often again bears a small coronet or a spathilla (PL 128, figs. 5-9), and 

 sometimes it is arrow-shaped (PL 126, fig. 2a). All these apophyses of the terminal 

 coronets as well as the anchor-pencils of the mantle and the finest branches of the 

 tubes, are hollow and filled up by jelly. 



The different number and arrangement of. the styles offers the best means for the 

 distinction of genera in the Ccelographida. The minimum number is six (Ccelogr aphis, 

 PL 126, fig. 1), the maximum number sixteen (Ccelothamnus, PL 122, fig, 3, and Ccela- 

 galma, PL 126, fig. 4). Since the arrangement of the styles in both valves is 

 constantly symmetrical, the fundamental form of the whole body is in all Cceloplegmida 

 " amphithect," as in the Ctenophora. The longitudinal or main axis of the body is 

 vertical, with two distinct poles ; the proboscis of the central capsule and the two 

 rhinocannse are directed upwards, to wards 'the oral pole ; the caudal tube of each valve is 

 directed downwards, towards the aboral pole. The two other axes of the body are 

 unequal, horizontal, and perpendicular one to the other ; each has two equal poles. On 

 the poles of the sagittal axis lie the galese of the dorsal and ventral valves ; on the poles 

 of the frontal axis lie the two secondary openings or parapylae of the central capsule. 

 The frontal fissure or the large cleft between the dorsal and ventral valves of the skeleton 

 lies in the vertical frontal plane of the body, which is perpendicular to the vertical sagittal 

 plane; the equatorial plane, however, is horizontal. 



The central capsule of the Ccelographida exhibits the same shape and position as in the 

 preceding Ccelodendrida. It is subspherical, slightly depressed in the direction of the 

 main axis, and lies enclosed between the two central valves of the lattice-shell. Its three 

 constant openings lie in the frontal plane, and therefore in the frontal fissure between 

 the two valves. The astropyle, or the main-opening of the capsule, lies on the oral pole of 

 the main axis, and its radiate operculum (d) is directed upwards ; the curved proboscis 

 arising from it (o) is prominent between the mouths of the two opposed rhinocannse. 

 The two lateral parapylse or accessory openings lie on both sides of the aboral pole, on 

 the right and left (PL 127, figs. 4-6). The large spheroidal or somewhat lenticular 

 nucleus (n) is usually about half as broad as the capsule, and contains numerous nucleoli. 

 The protoplasm around the nucleus contains many vacuoles, and in the oral part of the 

 capsule (between nucleus and operculum) often numerous groups of crystals (PL 127, 

 figs. 4-6&, 7). The double membrane of the central capsule exhibits the same shape as 

 in the other PH^EODAKIA. 



The calymma, or the extracapsular jelly- veil, is in the Coelographida very voluminous, 

 and includes the entire skeleton, the fork-thicket of the Ccelotholida, the lattice-mantle 

 of the Cceloplegmida, and also the prominent large styles. Only the distal ends of the 



