﻿GLABEOtrS MONTIPOE^. -27 



The specific name refers to the light, open reticuliirQ, not unlike that of a fine bath 

 sponge, which covers the surface. 



a. Macclesfield Bank, China Seas, 32 fathoms. Coll. Bassett-Smith. (Type.) 



9. Montipora crassi-reticulata. (PL II. fig. 5;; PL XXXI. fig. 9.) 



Description. — Corallum explanate, freely expanding, uneven, horizontal, of nearly even 

 thickness, 2 mm. at the growing edge, and 3 mm. at 6 to 7 cm. from the edge, supported by a 

 well developed concentrically wrinkled epitheca, following about 2 mm. "behind the growing 

 edge. 



Calicles minute, 0*5 mm., only faimtly differentiated from the ccenenchyma. Septa with 

 six well developed primaries and here and there rudimentary secondaries. Fossa deep. 



The streaming layer of the ccenenchyma is a thin open reticulum. Its elements bend 

 rather sharply downwards and upwards. In the former case, the tips end in a very distinct 

 solid layer resting on the epitheca, and in the latter case they form short, thin, but closely 

 packed vertical threads which may he straight and continuous, like trabeculas. On the surface 

 the ccenenchyma is a coarse open reticulum which is either naked or else covered with whitish 

 granules, which are the jagged tips of processes rising from the coarse reticulum. The large 

 meshes of the reticulum between the granules are conspicuous. 



There are two specimens, both fragments. The larger '{a) has been broken off from the 

 expanding edge of some stock of unknown shape. It differs from all the other thin explanate 

 Montipores from the Macclesfield Bank in the greater thickness of the coraUum and in the 

 coarseness of the surface reticulum. The upper surface is rendered very uneven, but the 

 irregularities appear to be largely due to swarms of minute Balanids which are in all stages of 

 burial by the surrounding ccenenchyma. 



The smaller specimen (b) is a portion of an expanding growth wikich has -spread over a 

 former growth, beyond the edges of which it projects. 



a. Macclesfield Bank, China Seas, 32 fathoms. €olL Bassett-Smith. (Type.) 



I. Macclesfield Bank, China Seas, 25 to SO ,, „ 



fathoms. 



10. Montipora pallida. (PL II. fig. 2 ; PL XXXI. fig. 10.) 



Bescfiption. — Corallum explanate (complete form unknown), of nearly uniform thickness, 

 2 mm. at growing edge, to 3 mm., with freely expanding edges, followed irregularly by an 

 epitheca, here and there reaching the growing edge, at} other times 5 mm. behind. 



Calicles minute, visible to the naked eye as faintly raised whitish rings, • 5 mm. in 

 diameter and about 1 mm. apart. The appearance of white rings is due to the fact that the 

 irregular septa with their tangential granular thickenings rise slightly above the level of the 



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