PORIFERA. I. 



63 



be any doubt that the present species is the same; it agrees also with the description by Fristedt 

 and Lam be of the specimens, by those authors referred to G.arcoferits. Spicula hi my specimen are 

 of the following forms and dimensions: a. Megasclera are oxea, straight or slight!)- bent, and e\-enly 

 and rather long pointed; their length is rather constant, and on an average 0-42""", the thickness, on 

 tlie contrar}-, is rather \-arying, 0-015— 0-022"""'); shorter and finer oxea are found in small numbers, 

 and are certainl}- developmental forms; h. Microsclera: i) Toxa; these var>- much in thickness, and also 

 somewhat in length, but the thinner and shorter ones I suppose to be developmental forms; the\- seem 

 to be begun in about their full length, and chiefly to grow onl\- in thickness. They are more or less 

 cur\'ed in the middle, and just at the point the ends have a little bend the opposite way; in the finest 

 of the bows the bend at the ends is often wanting. The length (which is somewhat dependent on the 

 size of the curve) varies from 0-057—0-178"'", the thickness varies from 0-0014—0-007"'"'; these are the 

 limits between which the sizes of all the bows are found, but also the bows, the thickness of which 

 in proportion to their length shows them to be quite developed, are somewhat varying, about from 

 0-119—0-178'"'", and the thickness from 0-005-0-007""". 2) Sigmata; these are small, of a length from 

 0-012— 0-019""", the thickness is about o-ooi'"'". 



With regard to the skeletal structure it is to be noticed tliat the ends of the spicules are united 

 by a distincth- observable mass of spongin. 



Locality: The only specimen, a little fragment, is from East-Greenland, ca. 72° 40' Lat. N., 20' 00' 

 Long. W., depth 100 fathoms. (The East-Greenland expedition 1891 — 92). 



Gcogr. distr. Barents Sea, depths 140 and 170 fathoms (Vosmaer); to the north-east of the 

 eastern Taimur peninsula, 76° 52' Lat. N., 116" 00' Long. E., depth 36 fathoms; Greenland 59' 33' Lat. N., 

 43 25' Long. W., depth 120 fathoms (Fristedt); the Gulf of St. Lawrence (Lambe). Accordingly the 

 species is wideh' spread in longitude, from 116 Long. E. to ca. 70 Long. W., but it has not been taken 

 south of ca. 45" Lat. N. 



2. G. angulatus Row.? 

 PI. XII, Fig. i2a,b, c,d. 



1866. //a/ic/ioi/dria aiigulafa Bowerbank, Mon. of Brit. Spong. II, 233, III, Tab. XLI, figs. 4 — 8. 



1880. Drsjiiacodcs angulatus Vosmaer, Notes from Leyden Museum II, 107. 



1887. Grllius augulatus Ridley and Dend\', Challeng. Report. Monaxonida, \'ol. XX, 2, 44. 



1892. — — Topsent, Resultats des Campagn. scient. du Prince de Monaco. Ease. II, 76. 



Of this species we have some roundish fragments, the largest of which has a greatest extent 

 of 43""", but we ha\e no whole specimen. I have not ventured to regard the determination as certain, 

 especiallv as the species has never been satisfactorily described, and the spicules have not been figured 

 since in Bowerbank, with the exception that Topsent (Contrib. a Tetude des Clionides. Arch, de 

 Zool. experiment, et gen. Ser. 2, Tom. V, bis, PI. \'I, Fig. 15) figures them, but with regard to the bows 

 his figure does not agree well with that of Bowerbank, and the given measures do not agree with 



') The .spicules may also in different specimens be of different thickness, as already meutioued by Vosmaer; in a 

 specimen before me from Greenland, sent from the Riksmuseum in Stockholm, the greatest thickness of oxea is thus o,oi5"i"i. 



