38 PORIFERA. III. 



the fibres; in the dermal membrane they are ranch less frequent, but in the papillae they are more 

 frequent on the inside, and they are very numerous in the pore-sieves. 



The identification of this species leaves no doubt according to the description and figures by 

 Thiele; e.g. his figure of the strongyle with the characteristic curvature is quite in agreement. Schmidt 

 mentions "Spangen", and Thiele has also found some single sigmates, but he thinks, that they do 

 not belong to the species; now it is curious enough that I also found sigmates, but quite singly, and 

 I think too, that they do not belong to this species; they are very scarce, and as the species always 

 envelops some incrusted material, it is easily understood, that foreign sigmates may occur in it. 



Locality: Station 2, 63 04' Lat. N., 9 22' Long. W., depth 262 fathoms; station 15, 66° 18' Lat. N., 

 25° 59' Long. W., depth 330 fathoms, (bottom temperature -f- 0° 75 C); station 25, 63° 30' Lat. N., 54° 25' 

 Long. W., depth 582 fathoms; station 89, 64° 45' Lat. N., 27° 20' Long. W., depth 310 fathoms; further it 

 has been taken at 62° 26' Lat. N., 4 49' Long. W., depth 220 fathoms, and 62° 29' Lat. N., 4 12' Long. W., 

 depth 283 fathoms (Ad. Jensen, the cruise of "M. Sars" 1902). The localities lie in the Davis Strait, 

 the Denmark Strait and at the Faroe Islands. The species is certainly an inhabitant of the warm 

 area; to be sure station 15 has a negative bottom temperature, but this station is situated at the very 

 border between the cold and the warm areas. 



Geogr. distr. The species was hitherto only known from Norway, South-west of Bukenfjord, 

 depth 106 fathoms (Schmidt 1. a). 



35. H. grandis u. sp. 

 PL III, Figs. 13-14, PI. IX, Fig. 3. 



Incrusting, but of massive appearance; surface smooth, bearing a number of thin, cylindrical 

 oscular and pore-papilla^. The dermal membrane solid, zvith horizontal spicules. The skeleton formed of 

 dermal spicules strongly developed, the main skeleton zocak, chiefly consisting of bundles of spictdes, 

 forming the lowermost part of the fibres of dermal spicules. Spicula : megasclera ; the skeletal spicules 

 acanthostyli zvith a very slight or no head, spined almost in the whole length, 0-41 — o-js""" (not divided 

 into two groups?) ; the dermal spicules long strongyla 0-48 — o-8o mm ; microsclera tzuo forms, cliehr 

 arcuat(F 0-042 — o'048'" m , sigmata o-oji — o-op6""". 



The specimens to hand of this species all grow on aggregated, large sponge-spicules; these 

 spicules are then overgrown, enveloped or more or less imbedded by the sponge; although the species 

 must thus in realit}' certainly be considered as incrustiug, it has however an outer appearance of 

 being more or less massive; the upper part of the sponge has at the same time a somewhat bladder- 

 like consistency which also contributes to its massive outer appearance. The surface bears a geuerally 

 great number of long, thin papillae or appendages which may reach to a length of i2 mm with a dia- 

 meter of o - 5 — i*5 mm . The appendages may be more or less erect or decumbent, and they are generally 

 more or less curved. The whole sponge is generally folded and wrinkled in different ways. The 

 species may reach a considerable size, the largest specimen is about 50 mm long and has an apparent 

 height of 15'""'. The colour (in spirit) is dirty yellowish or greyish white. The surface is smooth 

 without projecting spicules. The dermal membrane is solid and easily separable, and it is provided 



