448 Mr. H. J. Carter on Specimens 



inferred, as above stated, that each of the conical projections 

 on the terminal branchlets bears one, through which a 

 pseudopodium issues during the living state, in search of that 

 subtile kind of nourishment which the present emptiness of 

 the test indicates to have been the nature of the aliment. 



Cysteodictyina compressa, n. sp. 

 (PL XVIII. fig. 5, a-e.) 



Test bladder-like, flat, compressed, interrupted in its con- 

 tinuity by holes of different shapes and sizes, which thus give 

 it a reticulated appearance (PL XVIII. fig. 5) ; spreading 

 flatly over the surface of hard bodies, and thus following their 

 irregularities. Consistence firm, but fragile from its thinness. 

 Composition calcareous. Colour white, yellowish, or lilac. 

 Surface even, uniformly punctate ; puncta distinct, in juxta- 

 position ; circumference terminating in short radiciform ex- 

 pansions like those of Holocladina, viz. in conical points 

 (fig. 5,dd), mixed with an amorphous structure here and 

 there like calcareous sand-grains (fig. 5, ee). Internally, test 

 almost too thin for measurement, traversed vertically by tubules 

 in juxtaposition extending inwards from the surface, termi- 

 nating on the inner side in the midst of their prismatic divi- 

 sions respectively (fig. 5,b). Cavity of the test without 

 foreign material, continuous, and presenting the same kind of 

 dried sarcodic lining as that of Holocladina. Size of most 

 perfect specimen about half an inch in its longest diameter, 

 by about a quarter of an inch wide and about l-160th inch 

 thick. Wall, as before stated, almost too thin for mea- 

 surement. 



Hob. Marine, on the surface of hard bodies and in their 

 crevices. 



Loc. Gulf of Manaar. 



Obs. This species differs from Holocladina in not being 

 branched, but membraniform and lobate, in the greater thin- 

 ness of the test-wall, the absence of pustuliform eminences 

 on the surface, and the larger size of the pore- tabulation. In 

 other respects the same observations apply to it as to Holo- 

 cladina. The amorphous sand-like development here and 

 there on the processes of the circumference reminds one of the 

 amorphous structure at the ends of some tendrils in the vege- 

 table kingdom, and may serve a similar purpose. 



Ceratestina, n. gen. 



Gen. cliar. Test horny ; colour dark amber, translucent. 

 The composition of the test here brings us one degree 

 nearer than that of the Tcstamocbiformia to the absolutely 



