REPORT ON THE SIPHONOPHORjE. 335 



of Siphonophorse) was introduced by Carl Vogt (6), who in 1854 gave the name 

 Epibulia aurantiaca to a Calyconect, which had been named Galeolana by Blain- 

 ville seventeen years before (24, p. 139). Compare our Genus 26. Since also many 

 succeeding authors had retained the name Epibulia in the sense of Vogt, I followed 

 their example in my System, and had called the above mentioned species of Brandt, &c, 

 Arethusa (95, p. 35). But considering now more accurately the rules of priority, I 

 find it much more justifiable to employ the name Epibulia in the sense of the older 

 authors, Eschscholtz and Brandt. 



Epibulia ritteriana, n. sp. (PI. XXII. figs. 6-8). 



Arethusa brachysoma, Hkl., System der Siphcmophoren, p. 46. 

 Habitat. — Indian Ocean, Ceylon, off Belligemma, January 1882 (Haeckel). 



Corm. — The comj^lete corm of this beautiful Cystonect, which I captured in the living 

 state, off Belligemma, Ceylon, and which is figured in PL XXII. fig. 6, four times enlarged, 

 had in this fully expanded state a diameter of 30 mm. to 40 mm., in the contracted state 

 scarcely one-fourth of that size. All parts of the body were splendidly coloured, the large 

 ovate pneumatophore light red, with a purple pigment-cap in the apical third ; the 

 corona of palpons rose, the siphons and the tentacles yellow, and the gonodendra purple. 

 The vivid motions of this delicate Siphonophore, the variable play of the tasting palpons, 

 the feeding siphons, and the capturing filaments, offered a most splendid aspect. The 

 number of cormidia composing the corm was eight ; four siphons and tentacles, and four 

 large gonodendra were fully developed, two others (smaller) half developed, and two very 

 small and young. The number of palpons, however, which composed the corona beyond 

 the apical pneumatophore, was very large, forty to sixty or more, beside many young 

 buds, so that six to ten palpons may belong to each cormidium. All these parts of the 

 siphosome were so arranged around its vesicular axial trunk, that the palpons occupied 

 the proximal, the siphons the distal part of the cormidium, and the gonodendra were 

 attached between them (as in the A nthophysidse and Discolabidae) ; but usually the 

 siphons were more or less protruded, so that the gonodendra appeared to occupy the 

 central base of the corm. Unfortunately, I was not able to examine closely the form of 

 the central trunk of the siphosome, and the mode of attachment to the cormidia ; 

 probably it is similar to that of the Anthophysidae, Discolabidse, and Nectalidge ; all that 

 I could observe of the trunk was that it represented a shortly conical or ovate bladder, 

 coiled up in a spiral, with a single dexiotropic turning. 



Pneumatophore (PL XXII. fig. 6, p, in profile ; fig. 7, in vertical section through the 

 axis ; fig. 8, transverse section). — The great float filled with air is ovate, and has a 

 diameter of 10 to 12 mm. in the expanded state; in the contracted state, however, 



