\\Tllo\II-.hrs.K l'lf<>li(>SMl>\<"n LA, WII.I.SU. I'.lo 



margin between the tentacles, dull ot Manaar, neat Cevlon, in February. Color ( ?) Dis- 

 tinguished by its small si/e (when mature ?). 



Proboscidactyla "occidentalis" Browne. 



Il'illia oecideataJis, FMVK*S, 1889, Bull. Kssex Inst., Salem, vol. 21, No. 7, p. 109, plate 5, fig. 3. 



Prabasriilarltla orciilrnlalis, BROWNF, 1904, Fauna and Geog. Maldive ami I.aciadive .-Wlnprlagors, vol. 2, p. 726. 



Size ( ?) Bell pyriform, gelatinous substance thick. 4 main radial-canals, each ot which 

 gives rise to 2 side branches, which also branch; thus each main radial-canal reaches the mar- 

 gin bv 5 vessels. 2O tentacles with reddish basal bulbs. Gonads on the marginal sides ot the 

 stomach. 4 lips. A single cluster ot nematocyst-cells on the exumbrella between each suc- 

 cessive pair of tentacles. Island ot" Santa Cruz. California. Color (''} Is this only a young 

 stage ot P. flavicirrata : 



Genus WILLSIA Forbes, 1846. 



H'ilhi<i t FORHFS, 1846, Ann. and Mag. Nat. Hist., ser. i, vul. 18, p. 268; |84S, British \aked-eved Mediis.e, p. it). (FIISSJ, 



1853, Naturalist's Rambles Devonshire (.'oast, p. 359. 

 H'illia, AiiAssiz, I.., 1X62, Cont. Nat. Hist. U. S., vol. 4, p. 346. 

 ll'illtiii, PEACH, 1867, Journ. Roy. Institute, Cornwall, p. 357. 

 H'illin. HAH 'KFi , 1X79, Syst. der Medusen, p. li;S. BKOWNI, 1902, Annals Mat;. Vil. HIM., SIT. 7, Vol. 9, p. 280; 1904, 



HvdnmiriUis.e Muldive Islands, p. 729. MAAS, 1904, Sitzungsher. malh.-pltvs. Klasst- kgl. Bayer. Akad. der WisttDSchaft., 



B.I. 34, p. 4V). 



GENERIC CHARACTERS. 



Williadi with h or more primary radial-canals, each ot which gives rise to one or more side 

 blanches all of which extend to the bell-margin. 



The type species is tf illsni itfllntu Forbes, ot the northern coast ot Europe. Its hydroid 

 stock is I. /ir sabellarum Gosse. 



Willsia stellata Forbes. 



ll'ill^in stellata, FORRFS, 1846, Annals and Mag. Nat. Hist., ser. l, vol. 18, p. 268; 1848, British NakeJ-eve.l Medusa-, 

 p. 19, plate I, fig. i. BF.DOT, 1905, Revue Suisse de Znul., tome 13, p. I <;2 (literature to 1X50). BRIIWM., nO4, Kauna 

 anil Gcog. Maldive anil I.accadive Archipelagoes, vol. 2, p. 729. 



ll'iiliti stelldln, HAKCKKL, 1879, Syst. der Meilusen, p. 158. 



l.,ir suhfllMiim (hyilroul), Gossv, 1857, Trans. Lmnean Soc. London, vol. ;2, p. 113, plate 20. 



Ltir s<ibell<irnrn, HINI ks, 1X72, Annals and Mag. Nat. Hist., ser. 4, vol. 10, p. 313, plate 19. 



( ) lI'iHiu furrata, HAF.CKEI., Ibid., p. 158. 



It'illsia slrllata, Forbes = Lar sabellarum Gosse, BROWNF,, 1X96, Proc. Zool. Soc. London, p. 4(18; 1897, Proc. Zool. Soc. Lon- 

 don, p. 818, 9 figs, (the best modern description). 



Lar sabellariifii, BROWN*, 1905, Proc. Rov. Soc. Edinburgh, vol. 25, p. 753 (medusa only). 



Bell dome-like, about g mm. wide and 8 mm. high, with thick gelatinous walls, evenh 

 rounded. Stomach 6-sided, with well-developed, lateral lobes upon the sides ot which the 

 jMinads are situated. 



When the medusa is set free from the hydroid there are 6 straight, simple radial-canals, 

 60 apart, but when about I mm. wide a side branch grows out from each ot the () original 

 canals. These side branches grow out from near the middle points ot the original canals, 

 and the original canals then bend so that 12 vessels reach the bell-margin nearly 30 apart. 

 In the next stage another side branch arises, farther out than the first and on the opposite side 

 from each of the fi original canals, and finally a third branch grows out from the inner side of 

 the first branch. Thus each of the 6 original radial-canals gives rise to } branches, and hence 

 24 terminal canals reach the bell-margin. Owing to the bending of the radial-canals tin- 

 terminal branches are spaced with a fair degree of symmetry, but the intervals between the 

 ends are not constantly 15, for the space between the main canal and the last-formed branch 

 is apt to remain wider than the other intervals. (See Browne 1905.) 



There are 24 short tentacles, one at the end of each terminal branch of the radial-canals. 

 These tentacles have well-developed, basal bulbs and are tapering and shorter than the bell- 

 diameter. 24 short, blindly-ending, centripetal canals extend upward from bell-margin 

 under the surface of the exumbrella, alternating with the tentacles; and there is a cluster ot 

 nematocysts upon the exumbrella over each one of these centripetal vessels. There is no 

 ring-canal. 



The d-sided stomach is short, not being longer than one-half to two-thirds the depth of 

 the bell-cavity and there are 6 simple recurved lips. I he stomach differs from the Amer- 



