20 6 PORIFERA. II. 



way as the large ones; sometimes they are somewhat twisted. Their length is o - 022 — o-035' nm , and the 

 thickness at the curve is about o-ooi™ 1 ". Quite few specimens of forcipes are seen, forming, as to size, 

 a transition between the two forms. 4. Sigmata; they are of the common sigma-form, and are plane 

 or only very little contort; their length is 0-12— o-i4 mm , and the thickness 0-007 — o-oo8 mm . The micro- 

 scleres occur throughout the sponge and copiously in the dermal membrane; in the points of the 

 oscular papillae the chelae are found abundantly. 



This interesting species is a distinct one, and is well distinguished from the other Forcepia- 

 species. The form of the large forcipes might lead one to think of F. bulbosa Cart, but there is, in 

 other respects, great difference between these two species, thus with regard to the sizes of all the 

 spicules and especially of the forcipes and sigmata, and also with regard to the form of several of the 

 spicules; finally Carter's species is from Cape San Vincent, whereas the present species is a native 

 of the cold bottom. 



Locality : Station 113, 69° 31' Lat. N., 7 06' Long. W., depth 1309 fathoms (bottom temperature 

 -r- i°o C), six very small specimens; station 119, 67 53' Lat. N., io° 19' Long. W., depth 1010 fathoms 

 (bottom temperature -r- i c i C), one specimen. Thus the species is a native of deep water and of the 

 cold area. The two stations are situated between Jan Mayen and Iceland. 



4. F. Thielei n. sp. 

 PL VII, Figs. 1—2. PI. XIX, Fig. 5 a— f. 



Erect, formed like an irregular, thick leaf, attached below. One surface oscular surface, the 

 other pore surface. The oscular surface even with rather close-standing osc/tla. the pore surface with 

 more or less deep grooves separated by sinuous walls; the surface slightly shaggy. Tlie dermal mem- 

 brane a thin film, supported by bundles of dermal spicules. The skeleton a rather irregular, polyspieuiar 

 network; primary fibres are found, bending towards the surface, but irregular, between them close-set, 

 single spicules. Spicula: Mcgasclera : the skeletal spicules styli o-j/ — ay 2""", the dermal spicules tylota 

 0'34 — 0-40"""; microsclera of three forms, isochelce arcuafcr 0-021 — o-ojj""". forcipes erojy — ao6o""". sigmata. 

 plane or about plane, cru — o-/j""". 



This species is formed as an erect, thick, somewhat irregular leaf. Below it is expanded and 

 attached with a thick, lumpy base. The species seems to have grown directly on the bottom, a great 

 deal of gravel and other bottom material being found in the basal surface, and bottom material being 

 also embodied in all the lower part of the sponge. Most of the specimens in hand are only fragments, 

 only one of them is about entire; this latter specimen has a height of i8o mm , a breadth of i20 mm , and 

 a thickness of ca. 25 mm , farther down towards the base the thickness is about 50 m '". The fragments 

 seem upon the whole to have belonged to specimens of similar dimensions. The consistency is rather 

 firm, but little elastic and somewhat brittle. The colour (in spirit) is grayish white or whitish yellow to 

 light brown. The surface is different 011 the two sides of the sponge, of which one is the oscular side, 

 the other the pore side. The oscular surface is tolerably even; when oscula are shut, however, the 

 entrance to them are seen as rather deep, circular grooves. The pore surface, on the other hand, is 



