PEE SEY DROLDS: 
INTRODUCTION. 
TaHE collection of Hydroids made by Mr. Agassiz in the Eastern Pacific 
in 1904-1905 is a small one of twelve species, and some of these are repre- 
sented by single specimens. All of them are from the tropics, four are from 
the shores of Perico Island in the Gulf of Panama, three are from stations 
near the Galapagos Islands, two are from stations off Aguja and Callao, 
Peru, and one, Ovelia striata, was also collected in the open Pacific almost 
directly on the equator, some 1500 miles west of South America. Their 
names, localities, and bathymetrical distribution are shown in the accom- 
panying table : — 
Station No. Latitude. Longitude W. Depth. 
Pennaria pacifica, sp. nov. . . | Perico Id. 
Campanularia obliqua, sp. noy. . | Perico Id. 
Obelia striata, sp. nov. . . . 4742 N. 0° 3.4’! 117° 15.8’ | Trawl 2320 <¢ 
Obelia striata, sp. nov. . . . 4657 S. 7 12:5 | 84-950) Tow 300 ** 
PEs. - » ~ » « | Perico Id. 
Campanulina denticulata, sp. nov. 4672 Shs) WIG || es} ales} 2845 «¢ 
Pafoea gracillima .... . 4642 S. 1 30.5 | 89 35.0 300 ‘$< 
Thuiaria tubuliformis . . . . | Perico Id. 
Sertularella tropica. . . . . 4647 S. 4 33 87 42.5 2005 
Zygophylax chazaliei . . . . 4642 S: 1°30:5"| 89) 35.0 300 
Cladocarpus distomus, sp. nov. . 4630 iNew Gf 2:0))| Si 4285 Doomess 
Plumularia helleri . . . . . 4621 N. 6 36.0 | 81 44.0 581 &€ 
Plumularia helleri . . .. . 4622 INE ome 81 44.0 ively Ge 
Aglaophenia struthionides . . 4643 S. 1 28.7 | 89 48.5 100 * 
The most surprising fact about this cellection is that from the 116 
stations occupied on this expedition the hydroids are so small in amount 
and the species so few. From the shores of Perico Island, near the anchor- 
age of the “ Albatross,” in the Bay of Panama, there are four species, and 
the remaining seven are from eight of the stations after leaving Panama. 
That leaves 112 stations showing no hydroid life. Of the eleven species, 
Lafoea gracillima is the most widely known, but it has hitherto been re- 
ported from northern waters only ; Marktanner-Turneretscher 79° 5.4’ N. 
