238 Mr. H. J. Carter on Deep-sea 



40-1800ths inch long (fig. 31, h). Flesh-spicule short, acuate, 

 straight or slightly curved, inflated at the fixed extremitj, 

 spined throughout (fig, 31, c). As usual in Microciona^ the 

 whole of the spicules are arranged vertically ^ side by side, in 

 the thin lamina of which the sponge is composed. Size of 

 specimen about ^ an inch in horizontal diameter, and probably 

 not more than l-96th inch thick. 



Hah. Marine, spreading over hard objects. 



Loc. At station 65, in 345 fathoms. 



Ohs. This specimen is on the pebble bearing the Terebra- 

 tule over which Aplysina noivus has grown (PI. XII. fig. 1. A), 

 at the base of the calcareous worm-tube covered with Latrun- 

 culia cratera^ Boc, which is also thin, spreading, and lamini- 

 form, as will be hereafter noted. 



Microciona plana y n. sp. 



General form thin, laminar. Colour tawny. Surface hir- 

 sute. Pores and vents not seen. Spicules of two kinds, viz. 

 skeleton- and flesh-spicules. Large skeleton-spicule simple, 

 acuate, curved most towards the fixed end, smooth throughout, 

 65-1800ths by 1^-1 800th inch. Subskeleton-spicule the 

 same, but not more than half this size. Flesh-spicules of two 

 forms, viz.: — 1, acuate, bulbous at the large end, spined 

 throughout, 15-1800ths inch long ; 2, equianchorate, navicu- 

 lar, shuttle-like, 7-6000ths inch long. The skeleton-spicules 

 are arranged vertically side by side, the spined acuates 

 feather-like around the bases of the long spicules respectively, 

 and the anchorates scattered irregularly throughout the lamina 

 of which the sponge is composed. Size of specimen about 

 1 inch in horizontal diameter. 



Hah. Marine, spreading over hard objects, laminiform. 



Loc. At station 25, in 374 fathoms, near Cape St. Vincent. 



Ohs. This specimen is on the upper surface of a rough, flat, 

 slate-like stone, which also bore the living specimen of Macan- 

 drewia azorica that will hereafter be mentioned. The thin 

 lamelliform state of the Microcionina effectively precludes an 

 evident appearance of both pores and vents, which, although, 

 of course, present as part of the structure of a sponge, can 

 only be followed here with the microscope. 



Microciona intexta, n. sp. (PI. XV. fig. 43, a, J, c.) 



As Pachastrella intexta (which will be described hereafter) 

 grows in among the spicules of dead Corallistes Boicerhanku^ 

 extending from the surface downwards, so this Microciona 

 grows, causing a brown discoloration of the Corallistes^ which 



