rORIFERA. II. 



169 



zoological one; on the other hand, station 87 is a zoological one, and its temperature is -f- i°i C; a 

 confounding of these stations may therefore possibly have taken place. Fristedt has the species 

 from the Baffin Bay, 68° 08' Lat. N., 58° 17' Long. W., depth 169 fathoms. Accordingly the species is 

 known from the Baffin Bay and the North-Atlantic south of Jan Mayen and north of the Faroe 

 Islands, with a bathymetrical range from 169 — 673 fathoms, and it must be supposed to be a native 

 of the cold area. 



7. L. vicina n. sp. 

 PI. V, Fig. 12. PI. XVII, Fig. 1 a— f. 



Bush-shaped? with anastomosing branches. The surface shaggy. The dermal membrane very 

 thin, partly with projecting bundles of dermal spicules, partly with horizontal ones. The skeleton an 

 irregular, mostly polyspicular network; longitudinal fibres are found, connected by irregularly placed 

 spicules and spicula-bundlcs. Spicula; Megasclera: the skeletal spicjtles smooth styli o-yi — o-86 mm , the 

 dermal spicules tylota o-j2 — o'j8"""; microsclera of three forms, chela 1 arcuata o'ojj — o , o^f mm , sigmata 

 of two forms, small ones o-oiy — 0-02 j mm , larger ones 0-028 — o'ojj""". 



Of this species we have only two fragments; they show, however, that the species has an 

 exterior, quite similar to that of L. complicata, as they consist of some anastomosing, flattened branches. 

 The larger fragment has a longitudinal extent of 6o ram . The colour (in spirit) is yellowish white, and 

 the sponge has the same net-like appearance as the preceding species. The consistency is rather firm 

 and somewhat elastic. The surface is very distinctly, but somewhat dispersedly, shaggy from projecting 

 spicules. The dermal membrane is a very thin film, partly resting on the skeleton below, partly sup- 

 ported by dermal spicules. With regard to oscula and pores the facts are as in the preceding species. 

 The pores are for a great part situated in sieve-like areas; they were measured from quite small ones 

 up to o - 47 mm . Oscula are round openings of sizes from o'6 mm to ca. i^™ 1 ; but also in this species pores 

 and oscula may pass into each other with regard to size. 



The skeleton is in every respect constructed in a similar way as in L complicata. The dermal 

 skeleton consists of dermal spicules, partly forming bundles or short fibres that may project a little or 

 lie horizontally in the membrane, partly being found singly scattered in the membrane, but upon the 

 whole the dermal skeleton is little developed; further spicules from the main skeleton project. The 

 main skeleton is an irregular, mostly polyspicular network; fibres are found, running chiefly in the 

 longitudinal direction, but branching irregularly, and being upon the whole rather irregular. Between 

 them spicules and spicula-bundles are found irregularly placed, and bundles issue to the surface. The 

 longitudinal fibres do not bend towards the surface in any regular way, and as well in longitudinal 

 sections as in transverse ones the skeleton conveys an impression of greater irregularity than in com- 

 plicata. This may, however, be owing to the fact that we have only irregular fragments with copious 

 anastomoses, a thing that influences the regularity of the skeleton. Spongin is found in the fibres. 



Spicula: a. Megasclera. 1. The skeletal spicules are smooth styli; they are somewhat 

 curved, almost always nearest to the head-end, and the curve may be more or less strong, sometimes 

 it is a little irregular. The} - have an evenly tapering, rather long point. Their length is 071 — o - 86 mm , 



The Ingolf-Expedition. VI. 2. 22 



