﻿90 MADEEPORARIA. 



row of papilla3. A wrinkled epitheca closely supporting the edge, occasionally rolled back by 

 a reflection of the latter. 



Calicles conspicuous as deep, round, open holes (1 mm. in diameter) sunk in the surface. 

 Septa thus first appear below the surface, in two cycles, thin, the primaries projecting far into 

 the fossa, but irregularly so as nearly to fill the cavity. Calicles more or less in rows, i.e. in 

 the valleys between the radial series of papilla3. 



The ccenenchyma is purely reticular. The streaming layer is a thin thread reticulum 

 with open meshes, which dips very slightly down, forming here and there a solid layer on the 

 epitheca, but bends sharply up to form the thickening layer without any marked change in 

 its character. At the surface it rises into bluntly conical papiUte. The bases of these papillte 

 form no sharp angle with the surface, but slope gradually away. These papilla; rise from low 

 ridges which are later submerged by the thickening layer. Near the gi'owing edge the ridges 

 are alone visible, each ridge corresponding with a projection of the denticulate margin. The 

 valleys between the ridges are, as a rule, narrower than the aperture of the calicle. The 

 papiUffi seem to be formed by a fan-like arrangement of the reticular elements. The surface 

 is a very open, fluffy or hairy looking reticulum. 



This species differs from all others in the presence of the teeth round the margin and in 

 the regularity of the radial ridges. The papillae are round and conical and not long-oval, and 

 the calicles are Uke large round holes and very conspicuous. Of the five specimens, two are 

 quite typical ; unfortunately they are only fragments, showing, however, portions of the edge 

 and depths of 4 and 7 cm. The only complete specimen has been distorted, and the papillse 

 over a large part of the surface are quite irregular in size, shape and arrangement. Its upper 

 surface has begun to die down near the place of attachment. It measures some 10 cm. 

 deep. 



In addition to these there are two more fragments which were originally tied together 

 as if they had been fragments of the same stock. Though these differ somewhat from the 

 type in having very inconspicuous calicles, there can be no doubt that they are specifically 

 identical, and the difference is to be explained as due to the accident of growth. They are 

 very thin and seem to be almost entirely composed of the streaming reticular layer. The 

 small size of the calicles is due to the absence of the thickening layer. There is thus no trace 

 of the deep submergence below the surface which makes the calicles into the conspicuous 

 black holes of the type specimen. On one fragment, however, the ccenenchyma appears to be 

 rising and the process of submerging the calicles is beginning, and this links the two on to the 

 type specimens a and 6. 



a, I. Macclesfield Bank, China Seas, Coll. Bassett-Smith. 93. 9. 1. 88. ] 



25-30 fathoms. 97. 9. 25. 1. J (^^P^^-) 



c. Macclesfield Bank, China Seas, „ „ 93. 9. 1. 80. 



22-30 fathoms. 



d, e. Macclesfield Bank, China Seas, „ „ 93 9. 1. 84. 



25-30 fathoms. 



