ATLANT. DEEP-SEA EXPED. 1910. VOL. III]. 



SPONGIA. 



13 



middle to the distal end, where it is filiform (0.017 mm. 

 thick). Anatriaene, about double the length of those in 

 the type; cladi 0.120—0.170 mm. long. 



Geographical distribution: Tethyopsilla zetlan- 

 dica (Carter) has been recorded from the Atlantic (Shet- 

 land, Islands and Bahia), Pacific (64 — 284 m.) and Indian 

 Ocean (15 m.). 



The specimens of "Michael Sars" were dredged in 

 the Spanish Bay (35" 34' N, 7° 35' W); depth 1615 m. 

 (NB! If st. 41 proves the right the locality is: Between 

 Gran Canada and Cap Bojador. (Lat. 28" 8' N, 13° 35' W); 

 depth 1365 m.; yellow mud. 



Stelletta hispida Buccick. 



PI. IV, fig. 8. 

 Vide litter: 15, p. 41. 



St. 23. One specimen. 



A rounded mass about 4X7X9 cm. without any 

 base of fixation. Surface much abraded with a net of 

 spined ridges. Cortex, 4 mm. thick, bluish-brown; choano- 

 some light yellow. 



Spiculation. Megasclera: Ciwanosomal oxea 

 straight or curved, 3.5 -5.9 mm. long by 0.060- 0.085 mm. 

 thick. Cortical oxea, 1.3 mm. long, 0.017 mm. thick. 

 Protmvne (Ptagiotriaene?), rhabdome 1.85—2.40 mm. long 

 by 0.100—0.140 mm. thick, cladi 0.100—0.325 mm, long 

 by 0.085 mm. thick. Microsclera: Strongylaster and 

 tylaster, the single actine of which is about 0.0035 — 0.007 

 mm. long. Oxyaster with actines'of about 0.007 — 0.018 mm. 

 length. 



Geographical distribution. Stelleta fiispidahas 

 been recorded only from the Mediterranean. 



The "Michael Sars" specimen is from the Atlantic: 

 Spanish Bay (lat. 35" 32' N, long 7" 7' W.); depth 

 1215 m. 



Thenea muricata Bowerbank. 

 Vide litter: 15, p. 54. 

 St. 23. 3 fragments. 

 Three rather damaged fragments — the largest of which 



has a diameter of about 6 cm. It is often difficult to 

 distinguish this species from the closely allied Th. Sclimidtii 

 Sollas, and the locality affords no clue, the specimens 

 recorded being from a geographical area, the Lusitanian 

 province, where both species are met with. But the small 

 number of plesiasters, one of the usual distinguishing 

 characters, seems to prove, that it cannot be Th. Sclimidtii. 



Geographical distribution: Th. muricata has 

 been recorded from the North Polar Ocean down to the 

 Azores. 



The "Michael Sars" material was obtained in the 

 Spanish Bay (35" 32' N, 7" 7' W); depth 1215 m. 



Characella pachastrelloides (Carter) Sollas. 



PI. IV fig. 4. 

 Vide litter: 5, p. 403, 34. p. 40, 15. p. 76, 41, 95 



St. 23. One specimen. 



A small lump about 3 cm. X 3 cm. attached to a 

 basal cup of Regadrella phoenix. The surface, rather 

 damaged, is hispid and rough. Pores very fine, and the 

 oscula, about 1 mm., in diameter, are dispersed. Colour 

 in spirit yellowish. 



Spiculation. The spicules of the specimen from 

 the „Michael Sars" Expedition agree fairly well with the 

 spicules of those collected by the Princesse Alice (41, 

 p. 95) though on the whole they are somewhat larger in 

 the former. The spiculation of the microscleres is rather 

 doubtful, and no orthotriaenes have been observed. 



The spicules are: Megasclera: Oxea, 3 — 4 mm. 

 long by about 0.08 mm., in the thickest ones, Dichotriaenes 

 with rhabdomes varying from about 0.800 — 1.7 mm. by 

 0.111 mm. in the thicker part; protocladi about 0.170 

 mm. and deuterocladi about 0.500 mm. Microsclera: 

 large microxea 0.260 — 0.370 mm. and small microxea, 

 often centrotyles, about 0.05 mm., the spinulation of 

 which is rather doubtful. Amphiasters, 0.026 mm. 

 (very few). 



This species has now been recorded from the fol- 

 lowing localities: 



Stat. 



Locality 



De P th Bottom 

 m. 



Number of 

 Specimens 



Name of Expedition 

 Literature 



25 



Near Cape St. Vincent 



682 



300 

 736 



1 845 



793 

 523 



599 



563 



Sand, gravel, rock 



ferruginous 



gravel 



Rock 



Sand 

 Rock 



Coarse sand 



Fine sand 



1 small fragment 

 1 large samples 



1 



Several 



1 



Several 

 2 fragments 



"Porcupine" 



60 



43" 57' N., 9° 27' W 



Carter: Sponges from the Atlantic 

 Ocean. Annals & Mag 4 ser 18, 

 1876 p. 403. 



229 



38" 22' N., 30" 34' 39" W 



"Hirondelle" 



584 | 

 587 



38° 31' N„ 26" 49' 15" W 



Topsent: Sponges Atlantic Nord: 

 Result, des Camp. Scient. Monaco. 



38" 30' 30" N., 26° 50' 15" W. ... 



Fasc II 1892 p. 41. 



38° 36' 40" N., 27" 17' 15" W. ... 





597 



38° 27' N., 28" 03' 25" W 





866 



Between Pico and San Gorge 



38° 52' 50" N., 27" 23' 05" W 



"Hirondelle" 

 Topsent: Spong. Acores. Result. 



1367 



Near Terceira. 

 37° 34' N. 28" 56' 45" W 



des Camp. Scient. Monaco. Fasc. 

 XXV 1904 p. 95. 



23 



35" 32' N., 7° 7' W 



1215 



Yellow mud 



1 



"Michael Sars" 









