COUONAT.E PALKPIIYRA, XAUSITHOE. 553 



7,. pflavica. There are also 4 lanceolate, complexly folded lips. The medusa is only JO 

 mm. wide and is probably an immature stage. 



Palephyra indica Vanhbffen. 

 Palephvrainiii(a,\ \\uittfTK, .., 1902, Wisscn. Ergeb. deutsch. Tiefsee Expedition, Dampfer F0/</i'r/3, Bd. 3, p.ji, taf.j,fig. 10. 



Hell 12 to 16 mm. wide. 8 adradial tentacles, 8 marginal sense-organs, 16 marginal 

 lappets. 4 large, bean-shaped interradial gonads wider than the spaces between them. About 

 80 simple gastric filaments. Hell white, with faint brown, radial punctations in the radii of 

 the sense-organs and axial lines of the lappets. Stomach brown. Cult ot Aden from a depth 

 of about 500 fathoms. 



Vanhoften presents a beautiful figure of this medusa, drawn Irom lite. 



Genus NAUSITHOE Kblliker, 1853. 



MIUJI//IO?, KOLUKER, 1853, Zeit. fur wissen. Zool., Bd. 4, p. 323. GEGINBAUR, 1856, Zeit. fur wissen.Zoo!., B!. s, p. 111.- 



II ; r.i m ., c '.. mi I K., iS-s. \i-nL-n \ .1. unil Sinn i . i M .".-n,p. 105. GLAUS, 1883, Organisation Entwick. McJu- 



s<-n, p. 24. VANH ii ' . . [892, Erg b. ; i l'l,m].i< -n I. \pr,!iun, p. 21 ; 1902. Wissen. Kri;eb. deutsch. Tiefsee Expedition, 



Dampfer I'aldh-ia. Bil. -,, Lfg. i, pp. 28, 30; 1906, Nordisches Plankton, Nr. n, p. 43. MAAS, 1904, Result. Camp. Sci. 



I'n 1 1. . de Monaco, fasc. 28, p. ;;, ; i')o;, S, tpimmr-dusen der Siboga Exped., Monog. u, p. 18. Bicetow, H. B:, 1909, 



Mem. Mus. Cdinp. 7.<><>l. at Harv ird I ill' L^ . nd. 5", p. ',-,. 

 Oclogonia, MULLER, J., 1854, Muller's Archiv. fiir Anat., etc., p. 97. 

 'apsis, GF.OENHAUR, 1856, Mullet's Archiv. fur Anat., etc., p. 239. 



,1,1 I \ausiihnr t \'au [ihanla, HAKCKKI., 1880, Syst. dcr Mrduscm, pp. 486, 487. 

 Scyphostoma larva: 



Spwgicola fstularis, SCHVLTZE, T. E., 1877, Archiv. fiir Mikroscop. Anatomic, Bd. 13, p. 795. 



Stephanosc\ft/ius mirtibilis, AU.MAN, iS~4, Annals and Mag. Nat. Hist., SLT. 4, vol. 14, p. 237. 



Xtiittitfwf, I.'ii:iA\ro, S., umi MA^JR. P., 1890, Zool. Anzeiger, Jalir^- 13, p. 687. 



The type species is N. [>uiift<it<i of the Mediterranean, Atlantic, Pacific, Indian, and 

 Arctic Oceans. 



GENERIC CHARACTERS. 



Ephyropsidae with S (4 perradial and 4 interradial) marginal sense-organs and 8 adradial 

 tentacles. There are i'< marginal lappets and 8 separate adradial gonads, the gonads isolated, 

 not grouped in pairs. The central stomach communicates with a wide ring-sinus in the bell 

 by means of 4 perradiallv situated ostia; the 4 interradial septa between these openings give 

 rise to the entodermal gastric cirri. Peripherally, the ring-sinus gives forth 16 simple, unrami- 

 fied pouches in the radii ot the sense-organs and tentacles. The partitions between these 

 pouches are not complete, for there is a marginal ring-canal. No saccules on the subumbrella. 



\\ < may possibly distinguish the following "species" of Nausithoe: 



\ . i-u'!' f<r . punctured, central disk without radiating furrow^ l.iu-f t/"M.i.!s, gastra! filaments not gi 



into clusters. All oceans. 



N. clausi, with smooth central disk, small gonads- Caroline Islands, Pacific. 

 A', cballengrri, central disk with radiating furrows. Tristan d" Acunha, Snutli Atlantic. 

 A', albatroai, smooth central (!r !,, 1 >!u- . narrow marginal lappets. Gastral filaments grouped into clusters, with a numher 



of sep. ii ite ' In f'Ts in each interrajius. Gulf of Panama, Pacific Ocean. 

 .V. rubra, red color. Pitted central disk. Simple gastral filaments which are not grouped into clusters. Indian and 



South Atlantic Oce.ins=A'. pniirtiila (?) 

 N. picta, similar ti> \ . .NjrnMM, but with chocolate-brown or carmine gonads and blue gastric cirri = \. punciata ( ?). 



It is apparent that there are onlv 4 well-marked forms of Naiisithoe: (i) the punctata, 

 rulini, fiiitii group \\ith pitted central lens which lacks radiating furrows, and with gastric 

 filaments arising singly, not in clusiers; (2) .V. cLnifi with smooth central lens; (3) A. 

 albatrosst with gastric filaments grouped in clusters; (4) A . fliallfni-n with radial furrows 

 upon the central lens. 



The scyphostoma larva of Naiisithoe infests sponges and bears a superficial resemblance 

 to a branching hydroid. See N. f>iin,-t,iiii. I he medusa ot A ausithoe is peculiar in having 

 clusters of small crystals scattered at intervals within the ectoderm of its umbrella. 



