4f)Q 



TRACHYMEDUSiE— GERYONID/E. 

 nnd £oo£ tafS i. to abundance curing ,he sunrn.er a, B.aufo,,, North Crohn.. 1 



be ^ r e u b :roTr::LVa h Lr=l;=r»«"T t a r ,„„, „ r * *. ,» **- 



William K Brooks, who kindly presented them to me for use in this work. 



Family GERYONIDjE Eschscholtz, 1829, sens, restrict. 



Gtryomd* (in part), Eschscholtz, 1829, Syst. der A«le P hen p ^ g dcr Mcdusen , p . :8 o.-Maas, .893, 



Ge/yonU*, Geo.hb*^, .856, Ze,t fur ™. Zoo , Bd. I , p 5 • ^^ ^^ der ,,, 0|a Espe d,tion, Monog..o, 



Ereeb. der Plankton Expedition, Bd. 2, K. c. p. 27, '9°5> P deutsch. Tiefsee Expedition, Val- 



p. 59; .,06, Fauna Arctica, Bd. 4, Lfg. 3, P- ^^S^MTcwE Manaar, Roy. Soc. London, Suppl. 



^^.^a^S^^K^ CL P . Zool. at Hazard Col, g e, vol. J7 , p. „.. 



FAMILY CHARACTERS. 



Trachvmedus* with 4 or 6 radial-canals upon which the leaf-like gonads are developed 



tlSS "ana UU,:Z t ;:ral-ca„a,s. P De,.rop„,e„ t is rhrough a free-swimmrng - 

 ula, which becomes transformed into the medusa. 



TK„ Cprvonid* are distinguished by their expanded, leaf-like gonads. The tentacles also 



£=H SdtAS*£lp las', of all The same process rates place ,„ Gcr,o„ IO 



tract to a limited degree. Interrad.al, blind IV ena, g F treatment with osm.c 



Srt' tot'^rS^^he^^sr^of LcfX rrinsparenc, rha, nran, de.aiis 



° f '^dS^enTentXhe'staUows of co.srs for rheir developmen, rhe Geryonid, are far 



whenwe attempt to apply it to their classification and arrangement. 

 The genera of the Geryonidae are as follows : 



tMr^fi s^sr-s ££**& a& n- — ^ h d -° p iast uf ai1 and -* 

 ^^^^ ■*— i879 - s,milar to L,W8f " but 



with 6 rays instead of 4. 



