Vou. 2] Torrey—Hydroids of the San Diego Region. 
34. 
3o4. 
Hydrothecae smooth; internodes moderate; gonangia with high 
narrow transverse corrugations ..................... S. tricuspidata (p. 28) 
Hydrothecae smooth or roughened; internodes stout, geniculate; 
gonangia with distal spines or annulae or both..S. turgida (p. 29) 
. Margin of hydrotheca without teeth... .... S. desmoides (p. 30) 
. Margin of hydrotheea with two teeth 0... pee ee a ee 
. Teeth prominent; mouth of hydrotheea large... S. furcata (p. 31) 
. Teeth moderate, mouth of hydrotheea small ...... D. cornicina (p. 30) 
. Aperture of hydrotheca round; hydrotheca abruptly narrowed 
GUISE Sa eeree ean ORR ck, A ey Mice a tees IEA Oy Se S. filicula (p. 32) 
fy Nemalophoresmixedslyacl DLO dal ase eee ene ee nee em en 
: Nematophores fixed by a marrow base 2... cc coc eecceseeee eee ceceees 
. Stem simple; hydrotheca with dentate margin, no anterior intra- 
theeal ridge; corbulae without hydrothecae at bases of leaflets... 
Aglaophenia 
. Stem simple; hydrotheca with anterior intrathecal ridge; single 
sapracalyeine sarcostyle; no corbulae........ 2. oe... Diplocheilus 
. Hydrotheea with 11 irregular teeth ............... A. struthionides (p. 35) 
pEivdrothecanwitheONteetihe:£ 8. cn) eed Se eee eee ane en 
41. Median tooth recurved................ .... Een ee rm, eee te oe ee 
“lee Median tooth notmecurvedss ss ee A. pluma (p. 34) 
42. Hydrocladial nodes well marked; mesial nematophore reaches mouth 
Otmhiy Cobh Cae tees 5, tose OL. en Se de ee, A. inconspicua (p. 34) 
42. Hydrocladial nodes weak; mesial nematophore does not reach mouth 
ObghiyGro te Cae es ose yr ere. Soe da AA eager A. diegensis (p. 33) 
43. Margin of hydrotheca smooth; mesial nematophore very short and 
| ONROYEN Fk ot ras Ae ee dae OE POLE Rs Pre Ped D. allmani (p. 36) 
44. Hydrocladia pinnately disposed on erect stem without thorny pro- 
cesses or nematophorous branchlets; no corbulae ........ Plumularia 
45. Hydrocladial internodes thecate and non-theeate ...... ne Rey ai eae nee 
45. Hydrocladial internodes theeate only ..... .. P. plumularioides (p. 38) 
NOG AILSE pluminamS Vers Cpe tet a ete eee tale Ae ae 
. Nodal septa alternately transverse and oblique; thecate internodes 
twice as long as non-theeate —...0..... oe eeeeee cece Pealician(on 3) 
. Hydrocladia borne on short processes of stem, always alternate ....... 
P. setacea (p. 39) 
. Hydrocladia borne on long processes of stem, very slender, opposite 
Cis taillivgere teeta te hee Bs ...P. megalocephala (p. 37) 
36 
40 
43 
41 
42 
45 
46 
47 
