344 DISCOVERY REPORTS 



with feebly developed gonads; stomach darkly pigmented, lappet zone transparent 

 or the lappet muscle feebly brownish. 



In these stages the highly vaulted bell and pointed stomach of the hyacinthina type 

 is combined with the transparent lappet zone of the dodecabostrycha type. 



(3) Forma hyacinthina typica. 



High, narrow, pointed bell, from 35 to 80 mm. in diameter, rather higher than 

 broad, mostly with " Stielcanal "; lappets and pedalia slender, wavy line on the 

 under border of the coronal furrow ; stomach high, vaulted. Entire entodermal sys- 

 tem (stomach and peripheral zone) deeply pigmented, gonads not visible from out- 

 side. See for instance Haeckel, i879,pl.xxiv; Vanhoeffen, 1892, pi. i, fig. 2, and 1903, 

 pi. ii, fig. 9 ; Maas, 1904, pi. v, fig. 35 ; Mayer, 1906, pi. ii, fig. 5, «o« dodecabostrycha ! 



(4) Transitional stages between forma hyacinthina and regina. 



Similar to the so-called developmental stage of regina figured by Vanhoeffen, 

 1903, pi. ii, fig. 8, described on pp. 23, 24; 8-36 mm. diameter. Flat, central disc 

 broad, pedalia feebly developed, without " Stielcanal ", with or without poorly de- 

 veloped gonads, many gastric cirri. Stomach and peripheral zone evenly chocolate 

 brown, tentacles whitish. 



These specimens are obvious on account of their flat form, relatively broad central 

 disc, and even chocolate-brown colour. 



(5) Forma regina. 



The largest form, from 80 up to 200 mm. diameter, much broader than high, 

 blunt, dome-shaped, all organs broad, umbrella flat, tentacle bulbs and pedalia 

 broad, not globular, clefts between pedalia not reaching to the under border of 

 the coronal furrow, no wavy line there. Stomach mostly highly vaulted, rarely 

 rounded, mostly without " Stielcanal ". Stomach very deeply pigmented, covering 

 of the subumbrella very dark, peripheral zone less dark, reddish brown, mostly 

 with a pattern on the lappets. 



The main characteristic is here the whole blunt form of the medusa having all 

 the organs broadly and massively developed, the dome-shaped rounded bell being 

 broader than high.^ Cf. Brandt (1838), Chrysaora {Dodecabostrycha) dtibia, pis. 

 xxix, xxx; Haeckel, 1881, pi. xxiv; Maas, 1897, pi. x; Vanhoefl^en, 1903, pi. ii, 

 fig. 6 ; Mayer, 1906, pi. ii, fig. 6 (non dodecabostrycha !) ; Browne, 1910, pi. vii, fig. i 

 {noti dodecabostrycha), Broch, 1913, fig. i, type vi. 



''■ I fully agree with Maas (1897, p. 67), who writes: "Ein wirkliches Merkmal, das auch von der Con- 

 servierung sehr wenig betroffen wird, finde ich nicht in den Proportionen, sondern in der Gesammtfonn des 

 Schirmes, die an lebendem wie an abgetotetem Material gleich charakteristisch hervortritt. Die einen 

 Formen zeigen einen spitz zugehenden hochgewolbten Schirm, der noch einen Aufsatz mit Stielcanal tragt, 

 alle Teile, Lappen, Pedalien sind schlank; die anderen Formen zeichnen sich durch Breitenenttvicklung und 

 massige Entfaltung alter Hirer Teile aiis, der Scliirm ist viel flacker, die TentaJielbulben, Pedalien, etc., im 

 Verhdltnis breiter wie bet den ersterwdhnten. Die ersten entsprechen dodecabostryctia (mirabilis), die anderen 

 regina. Dazu kommt noch ein sehr charakteristischer Farbenunterschied . . . auch die Gesammtgrosse 

 bietet dazu etwas Anhalt, regina ist i. A. etwa i\-2 mal so gross wie dodecabostrycha" . 



