PORIFERA. II. 147 



same way towards the periphery. The specimens in question had been obtained in the beginning 

 of August. 



As I have had one of Armauer Hansen's type specimens for examination, I have been able 

 to identify the species with certainty. The species is rather interesting, and it seems to be closely 

 allied to the Damiria Prouhoi established by Top sent (Arch, de zool. exp. et gen. 1892, Ser. 2, X, 

 XXII); the exterior form of this latter species is a similar one, it has also a mixture of styli and 

 strongyla, and its colour, finally, is also orange and gets black in spirit. 



Locality: Station 9, 64 18' Lat. N., 2 7 00' Long. W., depth 295 fathoms; station 10, 64 24' Lat. N., 

 28 50' Long. W., depth 788 fathoms; station 89, 64 45' Lat. N., 27 20 Long. W., depth 310 fathoms; 

 station 127, 66° 33' Lat. N., 20 05' Long. W., depth 44 fathoms; it has further been taken at 65 27' Lat. N., 

 54 45' Long. W., depth 67 fathoms (Wandel), and 64° 27' Lat. N., 13 27' Long. W., depth 84 fathoms 

 (Ad. Jensen, the cruise of the (Michael Sars» 1902). Altogether ca. 12 specimens and some fragments. 

 The mentioned localities are situated in the Davis Strait, the Denmark Strait, and north and east 

 of Iceland. 



Geogr. distr. The species has hitherto only been taken by the Norwegian North-Atlantic Expe- 

 dition, station 275, 74 c 08' Lat. N., 31 12' Long. E., depth 147 fathoms. For this locality is stated a 

 bottom temperature of -=- o°4 C, whereas all the other localities from which I have it are positive ones 

 with bottom temperatures from 3°5 — 8°4 C. The locality of the Norwegian North-Atlantic Expedition, 

 however, is situated at the very border between the cold and the warm area, and its depth is rather 

 small, so that the species surely does not belong to the cold water, but is a native of the warm area. 



5. M. perspinosa n. sp. 

 PI. V, Fig. 1. PI. XIV, Fig. 7 a-e. 



The form lumpy, slightly lobed. The surface folded, not shaggy. The dermal membrane thin, 

 supported by recumbent bundles of dermal spicules, in places with horizontal spicules. The skeleton a 

 diffuse network of spicules and spicula-bundlcs, a few longer fibres are found. Spicula: Megasclera: 

 the skeletal spicules strong/v spirted acanthostyli 0-14 — 0-208""", the dermal spicules foruo/a with slightly 

 s fined, sometimes smooth ends o'/j — o-iyS"""; microsclera of two forms, a nearer spatulifera 0-018 — o-ojo""". 

 sigmafa 0-018 — 0-024""". 



This species is of an irregularly lumpy, slightly lobate form; the two specimens in hand are 

 attached to Hydroids, one of them together with a small specimen of Halichondria pauicea of a similar 

 form. One specimen has a greatest extent of 35 mm , the other of hardly 20 m,I) . The colour (in spirit) is 

 a dirty gray. The consistency is slightly elastic. The surface has more or less deep, irregular grooves 

 or folds, otherwise it is apparently smooth. The dermal membrane is a very thin film, partly supported 

 by somewhat projecting, but highly recumbent fibres and bundles of dermal spicules, partly in places 

 provided with horizontal, scattered spicules. Pores are found in some places of the surface in dense 

 groups, they were measured to a diameter of up to cvo6 mm . Oscula were not found. 



The skeleton. The dermal skeleton consists in most places of bundles of tornotes, which support 

 the membrane, but are generally more or less recumbent, most frequently highly so. In other places 



19* 



