PORIFERA. III. 



and which is based on the statement, that: "Topsent dargethan, dass die Raphides bei dieser Art sowohl 

 glatt als anch stachelig sein kounen", therefore loses its relevancy. Thiele describes in 1903 (Abhandl. 

 Senckenb. nat. Gesell. XXV, 945—947, Taf. XXVIII, Fig. 12 — 15) four new species of Tedania; about 

 one of these is stated, that it has distinctly spinulous rhaphides, with regard to two others is said 

 respectively "ziemlich glatt" and "kaum rauh"; only about the fourth it is said, that the rhaphides are 

 smooth; I think that a sufficient magnifying power would show, that they all have spinulous rhaphides. In 

 1905 the same author further describes (Zool. Jahrb. VI, 430—33, Taf. 30, Fig. 50 — 53) foiir new species; 

 these are declared to have spinulous rhaphides, only with regard to one this is not mentioned. With 

 regard to the forms mentioned by Baer (Arch, fur Naturgesch. 72, I, 1906, 17—19) as T. digitata varr. 

 sansibarensis, fragilis and conica the rhaphides are only spoken of in a few words, and it is not said, 

 that they are spinulous. Topsent describes (Bull, du Mus. d'hist. nat. 1907, 69, and Exp. Antarct. Fr. 

 I 9°3 — °5i 3°) PI- V, fig. 6) a new species T. Charcot/' and mentions, that the rhaphides are spinulous; 

 they are present in two forms, of which one is shorter than the other and has a swelling near one 

 end, a shape already noticed by Thiele for one of his species. — Finally I may note that the two 

 species described by Kirkpatrick (Nat. Antarct. Exp. Nat. Hist. IV, 1908, 32 — 33) variolosa and Coid- 

 maiii, and by the author referred to Tedania, are without rhaphides. 



Still it must be noted, that Ridley and Dendy in the description of T. actiuiiforiiiis advance 

 as probable the theory, that the rhaphides in this and in other species of Tedania are develop- 

 mental stages of the dermal spicules; the special shape and the whole structure of the rhaphides, 

 however, show with full certainty, that such cannot at all be the case, and besides the real develop- 

 mental stages of the dermal spicules are not difficult to find. 



Locality: Of this species we have a very large material from the whole Ingolf territory; 

 station 27, 64 54' Lat. N., 55 10' Long. W., depth 393 fathoms; station 34, 65 17' Lat. N., 54 17' Long.W., 

 depth 55 fathoms; station 46, 61° 32' Eat. N., n° 36' Long. W., depth 720 fathoms; station 52, 63 57' 

 Lat. N., 13° 32' Long. W., depth 420 fathoms; station 54, 63 08' Lat. N., 15° 40' Long. W., depth 691 fathoms; 

 station 78, 6o° 37' Lat. N., 27 52' Long. W., depth 799 fathoms; station 87, 65 02' Lat. N., 23 56' Long. W., 

 depth no fathoms; station 89, 64 45' Lat. N., 27 20' Long. W., depth 310 fathoms; station 94, 64 56' 

 Lat. N., 36 19' Long. W., depth 204 fathoms; station 97, 65° 28' Lat. N, 27° 39' Long. W., depth 450 fathoms; 

 station 127, 66° 33' Lat. N., 20 05' Long. W., depth 44 fathoms; further it has been taken in the Davis 

 Strait, depth 100 fathoms (Th. Holm), at East Greenland, depth 100 fathoms (Ryder), Axarfjord on 

 Iceland, depth 20 fathoms, ("Beskytteren" Otterstrom), at the East coast of Iceland, depth 38 fathoms 

 (Horring), Borgarfjord on Iceland, depth 85 fathoms, (Hallas, the type-specimen of Schmidt), on 64 56' 

 Lat. N., n° 48' Long. W., depth 115 fathoms, East of the Faroe Islands, depth 220 fathoms, (Ad. Jensen, 

 the cruise of "M. Sars" 1902), 64 58' Lat. N., 12 40' Long. W., depth 70 fathoms, (the fishery investigation 

 steamer "Thor"); South-east of Nolso, depth about 70 fathoms, (Th. Mortensen), between the Faroe 

 Islands and Shetland Islands, depth 255 fathoms (Wandel); in all about 25 larger and smaller speci- 

 mens. The localities are situated in the Davis Strait, the Denmark Strait, North, East and South of 

 Iceland, between Iceland and the Faroe Islands, at the latter and between these and the Shetland Islands. 

 Geogr. dislr. The species has earlier been taken South-west of Bukenfjord, Norway, depth 

 106 fathoms (Schmidt), the Barents Sea, depths 112, 128 and 180 fathoms ("Willem Barent"), off New- 



