: 68 porifera. ii. 



the same form as the large chelae in L. diversicliela ; they have a highly curved shaft, scarcely, how- 

 ever, so highly curved as in the mentioned chela, the terminal parts are small in proportion to the 

 length of the shaft, tooth and alae are stubby. Their length is 0-04 — o-058 mm , the smallest lengths being 

 rare, and the thickness of the shaft is 0-005— 0"Oi2 mm . Also in this chela the shaft is broadly elliptical 

 in section, and this is the cause of the variation in thickness. Developmental forms at different stages 

 were seen, the development is as mentioned under the large chelse in diversicliela. 2. Sigmata of 

 the small form; these are rather characteristic; they are highly curved, often almost in a circular 

 manner, the points, however, being generally curved a little more inward; they are plane. The sigmata 

 are rather small, but their size is tolerably constant, the length is 0-017 — o-023 mm and the thickness 

 about o'coi™"". 3. Sigmata of the large form; besides the small sigmata, which occur in great 

 numbers, a larger form is found only occurring very sparsely; they have the common sigmaform, the 

 ends are rather highly curved in a somewhat hook-like manner, and they are more or less contort. 

 Their length is 0-042 — o-055 mm , and the thickness is ca. o-oo2 mm . As mentioned, they occur in very 

 slight number, so that they might be supposed to be extraneous bodies; but as they show a distinct 

 form and may be found in any specimen by a closer examination, they belong doubtless to the species. 

 They must not be confounded with the youngest developmental forms of the chela, to which they 

 bear a superficial resemblance. They seem to occur especially in the dermal membrane. The other 

 microscleres occur through the whole sponge and especially in the dermal membrane, where in some 

 places the chelae occur rather closely. 



Remarks: As I have examined type specimens of the quoted species, established by Armauer 

 Hansen and Fristedt, I have been able to make a sure identification. As the original name, 

 under which it has been established, is complicata, this name must be used. Armauer Hansen's 

 description and figures of complicata might raise a doubt as to the specific identity; as, however, the 

 type specimen I have examined is the present species, and as Armauer Hansen's figure of the 

 exterior also absolutely belongs to this species, I have thought it best to take up the name; most of 

 the spicules described and figured by Armauer Hansen do not agree, and either he must have con- 

 founded them with the spicules of an Axinellid, as might well be done, as the species has some outer 

 resemblance to an Axinellid, or else there must have been an abundance of extraneous spicules in his 

 preparation. 



Locality: Station 141, 63 22' Lat. N., 6° 58' Long. W., depth 679 fathoms, (bottom temperature 

 -f-o°6C); station 143, 62 58' Lat. N., 7 09' Long. W., depth 388 fathoms, (bottom temperature -^o°4C); 

 70 32' Lat. N., 8° 10' Long. W., depth 470 fathoms (The East-Greenland Expedition 1891—92); ca. four- 

 teen specimens in all. The localities are situated north of the Faroe Islands and south of Jan Mayeu. 

 Geogr. distr. The species has been taken before by the Norwegian North-Atlantic Expedition, 

 and, according to the statement, at its station 84. For this station is stated a bottom temperature of 

 6°5 C. As now the two Ingolf-stations from which we have the species show negative temperatures, 

 and as also the locality south of Jan Mayen, according to the investigations of the Tngolf , must be 

 a negative one, it is not probable that the species occurs at a bottom with a temperature of 6°5 C. To 

 be sure, station 84 is situated at the very border between the warm and cold area, and so the species 

 might possibly be found there; but station 84, according to the list of the zoological stations, is no 



