ANTHOMEDUSjE r.VMXoltr.A, BOUQAINVILLIA. 



Bell 4 mm. high, 3 mm. broad, with vertical sides, flat top, and thin walls. 32 slender ten- 

 tacles with tightly coiled ends and large basal bulbs. A black, ectodermal ocellus lies upon the 

 velar side ot each tentacle-bulb ( plate I 5, fig. g). The velum is well developed. The 4 radial- 

 canals are straight and slender, but slightly swollen in the mid-region of their lengths, where 

 their inner sides are lined with gland-cells (plate i 5, fig. 6). The manubrium is flask-shaped, 

 and about halt as long as the depth ot the bell-cavity. The distal part of the manubrium ad- 

 jacent to the points ot entrance ot the 4 radial-canals is composed ot highly vacuolated cells. 

 The mid-region ot the manubrium is cruciform in cross-section and the mature genital pro- 

 ducts are found in the ectoderm ot the 4 interradial sides of the stomach. The mouth is at the 

 extremity ot a short neck and is surrounded by 4 oral tentacles, each ot which branches dichot- 

 omously ^ rimes and terminates in 8 nematocvst-beanng knobs, making in all 32 ot these 

 knobs surrounding the mouth (plate i 5, fig. 5 ). The entoderm of the manubrium and tentacle- 

 bulbs is dull, flesh-colored pink. In the youngest medusa seen the bell was O.(> mm. in diameter 

 and had only 4 oral tentacle-knobs, 4 marginal tentacles, and 4 rudimentary tentacle-bulbs. 

 This is one ot the most abundant medusae upon the surface in summer, among the Bahama 

 Islands. A single specimen was found at Tortugas, Florida, in July, igo5. Named in honor 

 of Dr. Alexander Agassiz. 



Genus BOUGAINVILLIA Lesson, 1836. 



Cvan<ra bou^ainvillii, LESSON, 1830, Voyage de la Cor/ui/le, Zool., torn, z, part. 2, ir Jiv., p. I 18, plate 14, Zoophytes, figs. 3, 



D,D',D",D'". 



Bougainvillia, LKSSON, 1836, Ann. ties Sci. Nat., Zool., scr. 2, torn. 5, p. 262. 

 Hi/>[>o(rene, BRANDT, (Mertens), 1835, Mem. Acad. Imperial)- des Sci. St. Petersliourg, Sci. Nat., SIT. 6, tome 2, p.22i). -Pre- 



occupied by OKEN, 1X17, for Mollusca.- -Ac.ASSiz, L., 1849, Mem. Amer. Acail., NYu Strie--, vol. 4, p. 250. 

 Bougainvilka, FORBES, 1848, British Naked-eyed Medusie, p. 61. 

 Boiigtiinnllm, AC.ASSIZ, L., 1862, Cont. Nat. Hist. I'. S., vol. 4, p. 344.- 

 Lizusa (young medusa), HAECKEL, 1879, Syst. der Medusen, p. 80. 

 llippocrene, HAECKEL, 1879, Syst. der Medusen, p. 90. 



Z, A., 



.^, North Amer. Acal., p. 152. 



ppocrene, AECKEL, 179, ys. er eusen, p. 90. 



BougainviUiaj HARTLAI;B, 1897, Wissen. Meeresuntersuch. auf Helgoland, Heft i, Abt. 2, p. 455. 

 Bougainmllea, MAAS, 1905, Ciaspedoten Medusen der Siboga Expedition, Monog. 10, p. 10. 



neu i, not. 2, pp. 472, 473. 



Boueainviffia, HART-IIT, 1904, Bull. U. S. Bureau of Fisheries, vol. 24, p. 37. 

 Boii^ainrillfti, GI.RD, 1892, Zool. An/eiger, Bd. 15, p. 312, 5 fign. (cell-division] development of morulu). 



GENERIC CHARACTERS. 



Margelina; with 4 radially placed clusters 

 of marginal tentacles, the tentacles ot each 

 cluster being all of one kind and similar in 

 structure each to each. Hydroid: Bougain- 



There are 4 radially placed, dichoto- 

 mously branching, oral tentacles, a quadratic 

 manubrium, 4 radial-canals, and gonads mi 

 the interradial or adradial sides ot the stom- 

 ach as in other Bougamvillidi. 



The type species ot the genus is Bougain- 

 villia nmclwiiiHii Lesson, 1836, from the Falk- 

 land Islands. This medusa was first described 

 and figured by Lesson, in 1830, under the 

 nzmtCyaneabougainvilhi. 1 he generic name 

 " (1\iim-n" was, however, previously used by 

 Peron and Lesueur, i8og, for Discomedusa;. 

 \lso the name Hippocrene of Brandt (Mer- 

 tens), 1835, was preoccupied in iSl/byOken 



for Mollusca and can not be applied to Medusa.-. It therefore becomes necessary to adopt 



the generic name Bougainvillia. 



fit;. 84. Bougainvillia "museui," after Allman, in R.iv 

 Sin-iety, 1871-1872. 



