MKIHS.K OF Win i|)S HOLE REGION, 67 



ATOLLA Haeckel ( L879) 

 Atolla bairdii Fewkes. 

 AtoUa baird'i Fewkes, Report r. S. Fish Commission 1884, p. 936. 



Umbrella disk-like, with aboral renter convex. Marginal lappets 44. marginal tentacles 22, each 

 supported by a gelatinous "socle." Rhopalia 22, situated in notches between the lappets. Manu- 

 brium large, with simple mouth; gastric pouches 22. 



Color. — Slightly bluish, with rust-colored patches, es] ially on the border of the coronal furrow. 



Distribution. — Gulf Stream, latitude 35-38, longitude 72-75. 



Atolla verrilli Fewkes. 

 Atolla verrtili Fewkes, Report T". S. Fish Commission 1884, p, 939. 



Umbrella flat discoid, »i to S times broader than high. Marginal tentacles 22 to 28, with the same 

 number of interposed rhopalia. Marginal lappets same in number as tentacles and rhopalia combined. 

 The umbrella is divided into two regions, a central disk and a peripheral corona, separated by a coro- 

 nal furrow. In some specimens the consistency was quite cartilaginous. 



Color. — A slightly bluish tinge. 



Distribution.— Gulf Stream, latitude 38-40, longitude 68-71; depth from 373 to 2,369 fathoms. 



Family UNERGIDjE. 



LINERGES Haeckel (1879). 

 Linerges mercurius Haeckel. 



Linerga mercuriui Haeckel. System der Medusen, 1S79, p, 495. Fewkes. Report U. s. Fish Commission 1871, p. 950. 

 Mayer, Bulletin Museum Comparative Zoology, Vol. XXXVII. 19(H), p. 6s. 



Reported as very common in Straits of Florida by Fewkes, and by Mayer as abundant in the Baha- 

 mas and Tortugas. Its occurrence within our portion of the Gulf Stream is therefore quite probable, 

 though not vet recorded. 



Family ULMARIDiE. 



KEY TO THE GEM'.I; \. 



1. Rhopalia 8; tentacles numerous, Bhort, borne on under margin of umbrella outside tie' velar tappets iurelia 



2. Rhopalia 16; tentacles numerous, long, in Hi clusters on the lower margin within the velar lappets Phacellopkora 



ATJRELIA Peron & Lesueur ( 1S09). 

 Aurelia flavidula Peron * Lesueur. PI. VI, fig. 2. and text cut. 



Aurelia flavidula Peron & Lesueur, Tableau des Meduses, etc., 1809, p. 359. Lesson, Histoire Naturelle <!<•> Zoophytes 



Acalephes, 1843, p. 376. 

 Medusa aurita Fabricins, Fauna Groenlandiea, 1780, p.363. Gould, Report invertebrates of Massachusetts, 1841, p. M 

 Meduea flavidula Gould, op. cit. 

 Aurelia flavidula L. Agassi/,, Contributions Natural History United states, Vol IV, 1862, pp.51, 160. A Agassi/, North 



American Acalephse, 1865, p. 1-. Haeckel, System der Medusen, 1879, p. 55 i 



Umbrella flat and disk like, Bomewhat arched above; margin normally 8-lobed and with 8 rhopa- 

 lia which are symmetrically disposed in the sinuses of marginal lobes. Marginal tentacles numerous, 

 but short, forming a delicate fringe 

 about the entire margin except at the 

 marginal sinuses. Radial canals hi, 

 of three sorts — perradial and inter- 

 radial, each of these branching and 

 anastomosing freely, and adradial, 8 in 

 number, simple and unbranched, pass- 

 ing directly from the gastric pouches 

 to the marginal canal. Manubrium 

 quadrate, with oral arms about as long 

 as the bell-radius, rather broad and 



heavy proximallv, but terminating in , .-,,•„•_,, 



' * -' ■ Scyphostomae of Aureha flavidula. 



slender pointed crenulated ends; en- 

 tire margins of arms more or le>s folded or scalloped and richly supplied with nematocysts. In 



life the oral arms are carried in an extended position, much as shown in the plate. Gonads 



