PORIFERA. I. 



95 



singh" and as sigmadragmata, which latter also in the present species seem al\va>s to be composed 

 of eight sigmata. The small sigmata have a regular form, their length varies from 0-014 — o-02i""°, the 

 thickness is ca. O'ooi"™, or still finer. These sigmata are not contort, and they are never seen in 

 bundles. They are present in much larger numbers than the large ones. 2. Rhaphides of two sizes; 

 the long rhaphides are hair-like and finely pointed; they have a length of 0-15 — 0'i6™"', and their 

 thickness is at most oooi""". These spicules may be found singly, but they occur chiefly in tricho- 

 dragmata of \'arying thickness. The small rhaphides are thicker, fusiform, and of a length of 0-043 

 — o-oS"'". The thickness is 0-0014—0-0017'"". These rhaphides are foimd in bundles, which often seem 

 to contain eight rhaphides, but may also be composed of a greater number. 3. Commata; small, 

 comma-shaped styli with a somewhat swollen head end; sometimes they are a little irregularly curved; 

 their length is 0-011—0-014""", and the thickness at the head end is 0-0012'°". All the forms of the 

 microsclera are found, besides in the dermal membrane, also in the other tissue of the sponge in 

 great abundance. 



Gemmulce? I have also in individuals of this species found gemmula-like bodies. Most fre- 

 quenth- thev were here found as roundish loose heaps of silicious globules, but also as distinctly 

 limited, more or less globular or roundish bodies, in which the silicious globules, it would seem, were 

 lying in a membrane or inside of it (PI. XVII, fig. i, 1). Generally these bodies had a diameter of 

 0-05 — 0-07'"". The silicious globules vary from 0-0015 — 0-0057'"'". ^^1 the globules in one heap are of 

 about the same size. In a few specimens these bodies were found especially abundantly. 



Locality: By the lugolf expedition this species has been taken on station i, 62 30' Lat. N., 

 8"" 21, Long. W., depth 132 fathoms; station 2, 63 04' LaL N., 9' 22' Long. W., depth 262 fathoms; station 3, 

 63" 35' Lat. N., 10" 24' Long. W., depth 272 fathoms; station 89, 64 45' Lat. N., 27° 20' Long. W., depth 

 310 fathoms; station 97, 65= 28' Lat. N., 27° 39' Long. W., depth 450 fathoms. It has further been taken 

 on 66" 20' Lat. N., 25' 12' Long. W., depth 96 fathoms; 63" 15' Lat. N., 9° 35' Long. W., depth 270 fathoms; 

 61^ 23' Lat. N., 5° 04' Long. W., depth 255 fathoms (Wandel); and at the Faroe Islands, a Httle to the 

 east of Sudero, depth ca. 150 fathoms (Th. Mortensen). In all about ten more or less damaged speci- 

 mens or fragments have been taken. All the localities are situated at the Faroe Islands, between the 

 Faroe Islands and Iceland, and in the Denmark Strait; and its bathymetrical range is between 96 and 

 450 fathoms. 



4. D. groenlandica Frstdt. 

 PI. \T, Fig. 14, PI. VII, Fig. 7, PI. XVII, Fig. 2 a— h. 



Desmacdla Prachii van groenlandica Fristedt, Vega Exp. vetensk. lakttagelser IV, 441, PI. 24, 

 figs. 38—45, PI. 28, fig. 14. 



'/■ 



The form caliciilar. The surface luith small conical processes formed by the ends of the fibres ; 

 the dermal membrane thin, only provided 7oifh microsclera. Oscula (only on the inside?) small, provided 

 with papilla-like projections. The skeleton consists of fibres, going from the base up through the sponge, 

 richly branching and anastomosing. Spongin is fotind cementing the needles, but not copiously. Sptcula: 

 Megasclera styli 0-94— rj7""" ; microsclera sigmata of two sizes, large ones of a peculiar form o'og — o-io""", 



