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



divided into two lip-like parts, halfway down from the summit, 

 parallel with the compression (fig. 19,a).) Dermal surface even, 

 consisting of sarcode densely charged with minute inequian- 

 chorates, whose large ends just project above the level of the 

 structure in which they are otherwise imbedded (fig. 16,/). 

 Pores not seen, but probably in the dermal sarcode. Vents not 

 seen. Internal structure dense, consisting of bundles of long 

 linear spicules, partly erect and parallel and partly transverse, 

 the former supplying the axial support of the body of the sponge, 

 and the latter that of the echinating processes (fig. 16,/"). Spi- 

 cules of two kinds, viz. skeleton- and flesh-spicules. Skeleton- 

 spicule of one form only, viz. long, smooth, acuate or sub-pin- 

 like, fusiform ; average largest size 65 by 1-1 800th of an inch 

 in its greatest diameters; head narrower than the shaft (PI. XV. 

 fig. 37). Flesh-spicules of two forms, viz. inequianchorate and 

 tricurvate. Inequianchorate (PI. XlV. fig. 17a, b) almost with- 

 out appearance of shaft in the front view, as the lateral arms of 

 the larger end reach down to those of the smaller one (fig. 17, b); 

 anterior arm petaloid, much shorter than the lateral ones 

 (fig. 17, b), presenting an elliptical tubercle where it is united to 

 the end of the shaft by the falx, which is extended halfway 

 down the petaloid arm ; lower end of spicule much aborted ; 

 shaft much curved : average largest size 5£ by 3-6000ths of an 

 inch in its greatest diameters. Tricurvate (fig. 18), smooth, in 

 the form of a minute hair-pin or pair of forceps — that is, 

 as it were, consisting of a smooth, linear spicule, bent into a 

 very acute angle, with attenuated arms, here terminated re- 

 spectively by a bulbous inflation (fig. 18, a) ; round at the bend, 

 and in its average largest size 9-6000ths of an inch long, with 

 a distance of 2-6000ths inch between the extremities (fig. 18). 

 Size of largest entire specimen 3£ inches long by 2-12ths in 

 transverse diameter; that in which the echinating processes 

 are most developed, 4-12ths inch in diameter. 



Hob. Deep sea. 



Loc. Atlantic Ocean, between the north coast of Scotland 

 and the Faroe Islands. 



Obs. This sponge appears in jars with the Nos. 52, 54, 57, 

 and 27 on them respectively, also in a little bottle with no 

 number. The three former numbers represent stations at 

 which the depth was 384, 363, and 632 fathoms respectively. 

 No. 27 is "Rockall Bank'" (lat.57°35'N.and long. 13°41'E.)— 

 that is, rocks in the Atlantic, west of the Hebrides and " 200 

 miles from the nearest land," with only 54 fathoms on them. 

 With the latter is a small Holtema, but nothing else in either of 

 the other jars. The capitate variety (fig. 19) is in jar No. 54 

 by itself. Besides the general form of this sponge — which 



