PORIFERA. II. 29 



strand in Iceland (Wandel); at the north end of Nolso, depth ca. 100 fathoms (Th. Mortensen); 62 30' 

 L,atN., 1 ° 56' Long. E., depth 275 fathoms (Ad. Jensen, the cruise of the « Michael Sars» 1902); altogether 

 ca. nine more or less damaged specimens. The localities are situated in the Denmark Strait, off the 

 northern coast of Iceland, between Iceland and the Faroe Islands, off the east coast of the Faroe 

 Islands, and to the north east of the Shetland Islands. 



Geogr. distr. Besides on the localities mentioned above the species has been taken about 40 

 miles to the north north west of the Shetland Islands, depth 345 fathoms (the Porcupines, Carter); further 

 it has been taken farther south, off New Foundland, depth 673 fathoms (Topsent). 



2. M. lingua Bow. 

 PI. IX, Fig. 6 a— f. 



1866. Hymeniacidon lingua Bowerbank, Mon. of Brit. Sponges, II, 187, 24. 



1866. Desmacidon const-rictus Bowerbank, ibid., II, 350, 4. 



1874. Raphiodesma lingua Bowerbank. ibid., Ill, 119, PL XLVII, fig. 8, 237, PI. LXXVII, figs. 1—6. 



1874. Desmacidon constrictiis Bowerbank, ibid., Ill, 181, PI. LXXI, figs. 3 — 10. 



1880. Esprria lingua Vosmaer, Notes from the Leyden Museum, II, 146, 24. 



1886. Esperclla Vosmaeri Levinsen, Dijmphna-Togtets zool.-bot. Udbytte, 20, 15, Tab. XXX, Fig. 11 — 14. 



1887. Esperia lingua Fristedt, Vega-Exp. vetensk. Iakttag. IV, 449. 



1892. Esperclla lingua Topsent, Resultats des Campagn. scient. du Prince de Monaco, Fasc. II, 88. 

 1896. Lambe, Transact, of the Roy. Soc. of Canada, ser. 2, II, sect. IV, 186, PL I, 



figs. 6, 6 a — f. 

 1904. Esperclla lingua Topsent, 1. c, Fasc. XXV, 200. 



Erect and somewhat tongue-shaped, or more irregular. The dermal membrane thin, supported 

 by projecting spicules, the surface consequently finely shaggy ; it is provided with sinuous or branched 

 pore-furrows. Oscula in the zipper half op the sponge, on the top of small oscular cones. The skeleton 

 consists of 'polysplenia? fibres branching up through the sponge The spicules piercing the dermal membrane 

 op the same size as the other spicules of the skeleton. Spicula: Megasclera styli or slightly marked subtylostyli, 

 sometimes with the upper end formed like a handle, o-jj — r/j"""; microsclera of three forms, auisochehe 

 palmata 0-028 — 0-002""", the larger ones often in rosettes; sigmata 0-021 — o-oj2"""; rhaphides in fricho- 

 dragmata 0-042 — o-oyS""". 



This species presents many points of resemblance with the preceding one. It is erect, and 

 those of the specimens in hand that are tolerably well preserved, are of a longish, somewhat com- 

 pressed form, and may, in correspondence with the name, very well be designated as tongue-shaped. 

 The largest specimen, which is much lengthened, is of a length of 23 cm , but of a breadth of only 5'5 cm , 

 and the thickness is scarcely 3 cm . Another specimen is of a height of io cm , and the smallest specimen, 

 which is more roundish, but also compressed, is of a height of a little more than 2 cm . The consistency 

 is rather soft, and the sponge is easily torn. The colour (in spirit) is most frequently whitish yellow 

 or gray. The surface resembles that of the preceding species, and furrows of the same kind arranged 

 in different ways are found. These furrows are also here smooth, while the other parts are a little 





