PORIhKRA. I. 



59 



skeleton are united b\- a clear, not copious, but distincth' obser\able mass of spongin. In the dermal 

 layer where the spicules are close together, spongin ma\- be observed, not onl\- at the ends of the 

 spicules, but also in other places where they touch each other, l)Ut only to a \cr\- small amount. With 

 regard to the skeleton it has still to be noticed that the sponge to a high degree incrusts extraneous 

 bodies, large spouge-spicules being especialh- frequenth- found. 



Spiciila are somewhat curved oxea, the curve is nuist freijueully even and round, but nui\' 

 also be more or less sharp, and sometimes it is somewhat irregidar; the spicules are e\enl\-, but ma\- 

 best be termed shortly pointed. Their length is between 0-28 — 0-35'"", the thickness \-aries frcnn 

 0-0I2 — 0-014""". Shorter and finer, down to quite fine oxea, developmental forms, are found, but in 

 small numbers; the finest ones have a length of ca. o-26'"'", and thus they are only little shorter than 

 the fully developed ones; the>- are very long tapering, and consequently the short pointing appears 

 onh' dming the growth. 



Locality: Station 78, 60' 37' Lat. N., 27 52' Long. W., depth 799 fathoms, one specimen; station 

 81, 61" 44' Lat. N., 27 00' Long. W., depth 485 fathoms, two small specimens; station 90, 64 45' Lat. X., 

 29° 06' Long. W., depth 568 fathoms, two larger and two .smaller specimens. The stations are all in 



the Denmark Strait, or somewhat south of it. 



2. Ph. elongatum Tops. 

 PI. VI, Figs. 3— 4, PI. XII, Fig. 8 a, b, c, Fig. 9. 

 1892. Rliizochnliiia rloiigala Topsent, Resultats des Canipagn. scieut. du Prince de Monaco, Fasc. 11, 

 75, PI. IV, fig,s. 5-6, PI. IX, fig. I. 



Tlir form irrrgiibir. soiiictiiiifs roiiiid/s/i. or Iriigtlicncd and sonirwliat cyliiidric. Tlic siirj<icr until 

 roundish -uarts. Oiilv friu fistiilcr. Extrnially a liard dermal layer, provided imtit very close-set spicules 

 in several layers parallel to the surface : the dermal layer with certain intervals nses into lozv, conical 

 prominences, through zvhich a spicule pro/ects. so that the surface is slightly and sparingly spinulous. 

 The interior skeleton consists of irregularly scattered spicules. Spongin present to a small degree, only 

 in the dermal layer. Spicula are comparatively thick and short, somewhat curved oxea ivith short points 

 o-i6—o-ig""". 



Of this species we have two specimens, which I determine as Ph. elongatum Tops., as the\-, 

 partly in form and especially with regard to the spicules, agree completeU- with this si^ecies. Both 

 specimens are of a roundish form, and the surface is warty from larger or smaller roundish prominences, 

 as is also shown in the figure of Topsent 1. c. The larger specimen has a length of 20"- and a breadth 

 of 15""". It is provided with three fistuke, of which two .seems to be whole, while the third is broken 

 off at the base. The two entire ones are of about the same length, ca. 8'"'", and have a thickness of 

 scarcely 2""". This specimen is especially highly incrusted with gravel and sand. The other specimen 

 is a little smaller, it has a greatest extent of 17'"'", and is somewhat compressed; it has two fistula; 

 placed close to each other, but both broken off. On account of the solid bark the sponge is hard and 

 firm, but the consistency of the interior is loose and soft. The colour (in spirit) is white, at most with 

 a slight \-ellowish tint. The surface that is apparently smooth, is nevertheless rough to the touch, 



