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



ANTHOMEDUSAE AND LEPTOMEDUSAE. 



The species has been described again by Maas 

 (1910) who mentions 16 — 20 tentacles of usual size and 

 a number of much smaller tentacles of the same shape. 



Hartlaub (1913) describes a specimen from the 

 northern part of the North Sea. It is undoubtedly a young 

 specimen, 6 mm. high with 8 tentacles. 



The specimens brought home by the "Michael Sars" 

 agree on the whole with the description given by Maas. 

 The umbrella is somewhat higher than a hemisphere. 

 The gelatinous substance is very thick. The exumbrella 

 is evenly rounded, without any trace of an apical pro- 

 jection. The manubrium is short and comparatively broad, 

 though not as broad as in Tiaranna affinis (see above). 

 Real mesenteries are not present, but the four perradial 

 edges of the manubrium are in their whole length tightly 

 connected with the proximal third of the four radial canals. 

 The adjacent parts of the wall of the subumbrella are 

 dragged inwards into the bell cavity, forming four gelatinous 

 projections. The edge of the mouth is somewhat folded, 

 faintly divided into four perradial lips. - • The gonads 

 are horseshoe-shaped. Hartlaub will not use this term, 

 because in his specimen the gonads are not folded in 

 the middle. This is undoubtedly due to the fact that it 

 is a young individual. In the specimens of the "Michael 

 Sars" the folding of the gonads also embraces the inter- 

 radial parts. The folding is fairly regular, about 12 

 transverse folds being present in each of the gonads. In 

 the specimen from the vertical haul the gonads contain 

 a number of comparatively large, whitish eggs, also in 

 the interradial parts. -- The four radial canals are slender. 

 The velum is narrow. — There are about 28 tentacles 

 with conical basal bulbs and a number of dwarf-tentacles, 

 2 — 3 between every successive pair of tentacles (Plate I, 

 fig. 3). The dwarf-tentacles are spindle-shaped, hollow, 

 the distal end provided with a cluster of nematocysts 

 (Plate I, fig. 4). — No ocelli are seen. 



Dimensions: a) The specimen from the vertical 

 haul: diameter 15 mm., height 12 mm. - - b) The speci- 

 men from the horizontal haul: diameter 18 mm., height 

 15 mm. 



Colour: In formalin the stomach and the tentacles 

 are orange. 



The specimens mentioned by Quoy et Gaimard, 

 Haeckel, and Maas were all taken in the Strait of Gi- 

 braltar. Hartlaub's specimen was found in the nothern 

 part of the North Sea. The specimens obtained by the 

 "Michael Sars" were taken in the Mediterranean just inside 

 the Strait of Gibraltar (stat. 19). The species has never 

 been found further east in the Mediterranean. From 

 what is known about the occurrence it is impossible to 

 state, whether the species has its main distribution in the 

 Mediterranean or in the Atlantic, though the specimen 



from the North Sea mentioned above, might indicate that 

 the species occurs in the Atlantic. 



5. Leuckart/ara octona (Fleming). 



Geryonia octona Fleming 1823, Edinburgh Philosoph. Journ., vol. 8, 



p. 298. 

 Leuckartiara - Hartlaub 1913, Nord. Plankton XII, I, 3, p. 285. 



13 specimens from the waters west of Scotland, all 

 identified by Hartlaub and mentioned by him, op. cit. 

 p. 290. 



Stat. 98. Lat. 56° 33' N, Long. 9° 30' W (SW of 

 the Hebrides), August 5th 1910. Young-fish trawl, 1000 

 m. wire. --2 fairly large specimens. 1 ) 



Stat. 99. Lat. 57° 45' N, Long. 13° 40' W (near 

 Rockall), August 6th 1910. --6 adult specimens. 



Stat. 101. Lat. 57° 41' N, Long. 11° 48' W (be- 

 tween St. Kilda and Rockall), August 7th 1910. 



a. Young-fish trawl, 1000 m. wire — 1 specimen 



b. Depth unknown. --4 adult specimens. 



6. Neoturris pileata (Forskal). 



Medusa pileata Forskal 1775, Descriptiones animalium. . ., p. 11*). 

 Neoturris Hartlaub 1913, Nord. Plankton, XII, I, 3, p. 326. 



Stat. 101. Lat. 57° 41' N, Long. 11° 48' W (be- 

 tween St. Kilda and Rockall), August 7th 1910. — 1 speci- 

 men (Hartlaub determ., mentioned op. cit. p. 328). 



7. Pandaea conica (Quoy ct Gaimard). 



Dianaea conica Quoy et Gaimard 1827, Annates des Sci. Nat., tonic 



10, p. 182, pi. 6 A, figs. 3, 4. 

 Pandea Lesson 1843, Hist. Zoopli. Acal., p. 288. 



Pandaea - Hartlaub 1913, Nord. Plankton, XII, I, 3 p. 338. 



Stat. 19, Lat. 36° 05' N, Long. 4° 42' W (Mediter- 

 ranean, just inside the Strait of Gibraltar). May 2nd 

 1910, surface. — 4 specimens, indentified by Hartlaub 

 and mentioned op cit. p. 339. 



The label of the specimens is marked: Stat. 19, 2 — 

 V — 1910, Surface. — Owing to a misreading Hartlaub 

 states, that the specimens in question were taken in the 

 Bay of Biscay, Lat. 45° 26' N, Long. 9° 20' W, May 

 2nd 1910. - - It will be seen, that the statement of the 

 date is correct, but the position corresponds to "Michael 

 Sars" stat. 10, April 19th — 21st. — In fact, the species has 

 never been found in the Atlantic north of the Strait of 

 Gibraltar. It is known from different places in the Mediter- 

 ranean and has been taken by the "Valdivia"-Expedition 

 in the Agulhas Current in the South Atlantic (Vanhoffen, 

 Deutsche Tiefsee-Expedition. Bd. 19, 5 Heft, 1911, p. 209). 



! ) By a misprint Hartlaub has given the Lat. 56° 53' N for 

 56° 33' for these specimens. 



