350 DISCOVERY REPORTS 



St. 391. i8.iv. 30. 55° 48^' S, 52° 35' W, between Falkland Islands and South Orkneys. 4I- m. 

 tow-net, 1200-1300 (-0) m. 



Five specimens: one specimen with large (10 mm. wide) round opening at the apex, another with 

 6 mm. wide opening, one with closed cicatrice, stomach trumpet-shaped or of a broad pyramidal 

 form, with eight pockets, all with well-developed gonads. Stomach in all very dark purple-brown. 

 One specimen with hyaline lappet zone without design, one specimen with faintly pigmented lappet 

 zone and distinct pattern, three specimens with dark reddish brown diffusely pigmented pedalia and 

 lappets. 

 St. 461 E. 22. X. 30. 56° 41' S, 20° 24' W, west of Bouvet Island, i m. tow-net, no depth indicated. 



One specimen very large, badly preserved, stomach highly vaulted, no "Stielcanal", many long 

 white gastric cirri, gonads well developed, tentacles very thick, 250 mm. long, white or mother-of- 

 pearl-coloured, with traces of brown pigment, stomach very dark purple, peripheral zone zvith reddish 

 brown pigment, lappets with pattern. Type of the so-called large " dodecabostrycha" , sensu Brandt. 

 St. 461. 21. X. 30. 56° 44' S, 2° 22' W, west of Bouvet Island, i m. tow-net, 525-420 m. 



One specimen, very plump, broad, stomach pyramid-shaped, no "Stielcanal", gonads feebly de- 

 veloped, stomach dark purple, peripheral zone diffusely light brown, with faint pattern on lappets, 

 preserved in spirit. 



St. 366. 6. iii. 30. Four cables south of Cook Island, South Sandwich Islands. Large dredge, 

 155-3221-0. 



One specimen not well preserved, stomach highly vaulted, with small " Stielcanal ", gonads feebly, 

 gastric cirri well developed, stomach dark purple, peripheral zone hyaline, without pattern, traces of 

 pigment on lappet muscles. A large "dodecabostrycha" in the old sense. 

 St. 383. 14. iv. 30. 60° 32' S, 62° 42' W. South Shetlands. 70 cm. tow-net, 1500-1000 m. 



One specimen in fair condition, damaged on the peripheral zone, central part with polygonal fur- 

 rows, stomach trumpet-shaped with eight pockets, no "Stielcanal", stomach very dark, purple 

 brown, lappet zone and pedalia diffusely pigmented with dark reddish brown, with pattern on lappets, 

 tentacles white. 



The question whether the species hyacinthina and dodecabostrycha must be united or 

 kept separate is, I beheve, definitely settled (Bigelow, Mayer, Broch). I shall consider 

 here, therefore, only the relation between the species regina and dodecabostrycha. 



In point of fact the distinction between a large dodecabostrycha and a full-grown 

 regina seems impossible to me. Broch and Bigelow (1928) found specimens precisely 

 intermediate. The large size and the low dome-like bell are common to both. I therefore 

 cannot agree with Vanhoeffen (1903, p. 22 ; 1908, p. 36) who attributes these characters 

 to regina alone. The form of the stomach is very variable, and its shape — whether 

 evenly rounded or dome-like, or highly vaulted, with or without an apical projection 

 into the mesogloea (" Stielcanal")— may be dependent on the physiological condition 

 of the medusa. An evenly rounded floor of the subumbrella is occasionally to be seen 

 in dodecabostrycha too (Mayer, 1906, pi. ii, fig. 6). In many cases the pointed stomach 

 is so highly vaulted that there is no space left for a " Stielcanal". There remains, there- 

 fore, as a principal character for regina the form of the pedalia only, whether globular 

 and thick or slender and rectangular. I cannot, however, attribute to this character such 

 decisive importance as has been done by previous authors, because in the type specimen 

 the pedalia are not globular, but feebly developed and rather rectangular; because the 

 pedalia in the other descriptions and figures of regina are described and figured in a very 



