36 AMERICAN HYDROIDS. 



than in that species and the gonangia are much less slender and have the corrugations horizontal 

 instead of spirally disposed. 



CAMPANULARIA PTYCHOCYATHUS Allman. 



Plate 2, fig. 4. 

 Campanularia ptychoci/athus Allman, Challenger Reports, Hydroida, pt. 2, 1888, p. 20, pi. 10, figs. 2, 2a. 

 The following is the entire original description : 



2VopAosome.— Hydrocaulus a creeping stolon sending off at short intervals the peduncles of the hydrotheca. 

 HydrothecsB obconical, deep, with the margin deeply dentate and with the walls for some distance below the orifice 

 very thin and collapsible; peduncles long, annulated at intervals. 



Gonosome— Gonangia borne by the creeping stolon, destitute of annulation, deep, cylindrical, but narrowing 

 towards the base, where they are supported on a short annulated peduncle, and with a constriction just below the 

 wide truncated summit; orifice wide, circular, occupjing the summit, of the gonangium. 



Locality. — Bahia, Brazil. 



This species has not, I beheve, been reported since its original discovery by the Challenger. 

 CAMPANULARIA DENTICULATA Clark. 



Plate 3, figs. 6, 7. 



Campanularia dentieulata Clark, Proc. Acad. Nat. Sci., Philadelphia, 1876, p. 213. 

 Campanularia denticulala Nutting, Hydroids of Harriman Alaska Exped., 1901, p. 171. 

 Campanularia denticulata Fraseh, West Coast Hydroids, 1911, p. 29. 



Trophosome} — Colony consisting of a creeping roots tock growing over other hydroids 

 and giving off erect, usually, but not always, simple pedicels. The rootstock is intertwined 

 around its support in a very complex manner, so that the pedicels are often in thick-set clumps. 

 The rootstock is considerably thicker than the pedicels and its surface is smooth. The pedicels 

 are exceedingly variable in length, but sometimes attain a length of 3 mm. They usually 

 show three or four distinct large annulations at their distal ends and smaller but more numerous 

 ones at their proximal ends and are commonly without regular annulations throughout their 

 median portions. Exceptionally, however, they are annulated throughout. The hydro- 

 thecae are rather large, campanulate, with walls quite thin and collapsible. The margin bears 

 12 to 16 sharply pointed teeth and the diaphragm is quite distinct, leaving a rather larger basal 

 chamber than in the nearest allies of this species. 



Gonosome. — The gonangia have hitherto been undescribed. They are borne sometimes on 

 the rootstocks and sometimes on the pedicels. They are quite large, elongate-ovate in form, 

 borne on a short annulated stalk, and have a very wide aperture which occupies the entire 

 truncated distal end of the gonangium without any evident rim or collar. They contain from 

 two to four developing ova or sporosacs. 



Distribution. — The type-locality is Port Etches, Alaska; also reported from Orca, Alaska 

 (Nutting), and San Pedro, California (Torrey). The latter identification, however, seems very 

 doubtful to the present writer, judging from Torrey's description and figures.^ 



CAMPANULARIA HESPERIA Torrey. 



Plate 3, fig. 5. 



Campanularia hesperia Torrey, Hydroids of the San Diego Region, 1904, p. 12. 

 Campanularia hesperia Fraser, West Coast Hydroids, 1911, p. 31. 



Tro-phosome? — Colony consisting of a creeping rootstock which is undulating but not regu- 

 larly annulated. Stems in the form of unbranched pedicels which are erect, rigid, shorter 



' Description of a specimen from station 2865, lat. 48° 12' N.; long. 122° 49' W.; 40 fathoms. 

 ^ Torrey afterwards, 1904, decided that the species that he had called C. dentimlata is really separate He de- 

 scribes it under the name of Clytia vn.ivcrsitatis. Hydroids of the San Diego region, 1904, p. 19. 



' Described from specimens sent by Doctor Torrey and labeled " C. hesperia, La Jolla, California, July, 1903 " 



