University of California Publications. [ ZOOLOGY 
. Not annulated; hydrotheeae shallow, margin not everted... 
es das cease haat ee Sear kw ran ee eee H; kofoidi (ex 1) 
19. Opereulum of numerous small triangular pieces; unbranched; 
hydrotheeae tubular .......... een a Calycella, C. syringa (p. 20) 
MSO) ING ovyo xe @ ua a nae ay enc a wae ceo Fee eee 
20, Gonophores SGSsiles SPOTOSRCB co aeere eee ee Caapenuiena 
202 SG ONO MORES ETE C: W012 GS ie hee eee ee nay eee cern ee eee 
21. Stems branched, non-fascicled; nedattniees with 12-14 marginal 
IHX 1 Motes a a Le RED Tale Pete Sa ag Na eo WALT aD io! C. edwardsi (p. 11) 
Dy Stems wmbranched sf. co. eee ce eee eeereee 
22. Hydrotheeal margin with 12-15 crenations; gonangium compressed, 
paris AVORbMEO: 2c ees Poca es a C. everta (p. 12) 
22. Hydrotheea with 10-12 square- siege teeth............ C. hincksi (p. 13) 
99 
. Hydrotheea deep, with 11-12 short, sharp teeth....C. hesperia (p. 12) 
. Hydrotheea small, tubular, with 9 low blunt teeth 
bas Ps PP rey ee ete cee _C. volubilis (p. 13) 
23. Medusae ieorated with ab dleastulortentacles! 225. Obelia 
23. Medusae liberated with 4 tentacles... 2.0.0.0... 1c cee eee Clyttia 
24) Eiydrothecal marcin Su 0 th eects. cec ccs ca cneaas cone acereseree ALP hp 
24. Hydrothecal margin bidentate........... .............. Rote corona ate: 14) 
25. Branching irregular; stem non-geniculate....... a. dichotoma (p. 15) 
25. Usually unbranched, except for pedicels; latter on shoulder pro- 
}. Stems simple ......... 
. Branched; hydrotheea delicate, with about 14 carinate teeth 
. Hydrothecae in two rows ...... 
2. Hydrothee ss margin dentate : 
. Hydrothecal margin entire, everted, hydrotheca tubular; branches 
. Three marginal teeth -.................- ... : 
3. Four marginal teeth; hydrothecae and. Hone paauienee 
cesses of geniculate stem... ......................O. geniculata (p. 15) 
. Stems and branches polysiphonic; colonies large and _ bushy, 
hydrothecal margin with 12-15 teeth ........ C. universitatis (p. 19) 
.C. hendersoni (p. 18) 
. Unbranched; hydrotheas Te with thick wall, crenate margin; 
gonangium compressed, wide aperture .. ...... C. compressa (p. 17) 
. No branches except hydranth pedicels; latter usually with but 
single annulus; hydrothecal margin smooth C. bakeri (p. 16) 
, “Eiydmothecne Biratg hit. 2c. cc.c is cxes tosh eres eke eerie ene Lafoea 
29. Hydrothecae sessile; stem creeping or erect and polysiphonic 
SE c Nee als nGImosa: (pees) 
. Hydrotheecae alternate, one to an internode .. . Seneniavetia group 
. Hydrotheeae opposite, one pair to an rien ane re Dynamena group 
. Hydrothecae subopposite to alternate, more than two to an internode 
A Sch ee OE AR tice hG re Se Ete tens oe D DUWIATIAl group 
and gonangia rising within hydrothecae.........S. halecina (p. 26) 
eM Pete ach Le. Ee A TL er ee ee fee Satenellang (p-e28) 
. Hydrothecae corrugated; internodes long, slender; gonangia 
SpimOdOse 4.5 8S, face an te ces wee PEO MEM SISH(D AS AM) 
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