934 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
A study of the geographical distribution of the forms included in the collection 
reveals unmistakable relationship with the Australian region. One indication 
pointing strongly to this conclusion is the great number of Plumularidse, which 
constitute about one-third of the species. The west coast of North America, and 
particularly Alaska, is characterized by a relatively poor representation of that 
interesting family, while Australia is one of the great centers of distribution of these 
typically tropical hydroids, the only region that rivals it being our own West Indian 
waters. In proportion to the total number of species collected, the Hawaiian region 
seems to be nearly as rich in these very graceful and interesting Hydroida as is the 
Australian. 
In the following table the author has included, for the sake of completeness, the 
two Hawaiian forms, Campanuiaria retroflexa Allman and Plumularia buskii Bale, 
that were not collected by the Albatross during her recent cruise. 
Geographical and bathymetric distribution of Hawaiian Hydroids. 
(The asterisks denote the new species in the Albatross collection.) 
Austra- 
• lia. 
Califor- 
nia. 
West 
Indies. 
Alaska. 
Arctic. 
pe U an' and 
pean - coast. 
Bathy- 
metric 
distribu- 
tion, in 
fathoms. 
*Hydrodendrium gorgonides 
272-296 
Ceratella fusca 
+ i 
Eudendrium rameum 
+ 
4- 
4- 
4- 
99 
Eudendrium capillare 

+ 
+ 
4- 
134 
*Balea mirabilis 
1 
127 
*Corydendrium corrugatum 

99-314 
* Corydendrium minor 

99-138 
* Halecium scandens 
59 
* Campanuiaria eioisa 
""""" 1 1 1 ii m 1 1 
59-138 
Campanuiaria spinulosa 
52 
Campanuiaria retroflexaa 
20-40 
*Stegopoma gilberti 
122-143 
* Stegopoma gracilis 
95-213 
*Stegopoma plumicola 
59-163 
* Opercularella longi cauda 
138 
Calycella syringa 
+ 
+ 
’*** + *’** 
95 
Lafoea dumosa 
1 
+ | 
+ 
+ 
+ 
4- 
10-143 
Lafoea fruticosa 

+ 
+ 
4- 
4- 
99-176 
* Lafoea contorta 
1 
I 
59-122 
Lictorella halecioides 
+ j 
4- 
+ 
4- 
95-163 
* Lictorella cervicornis 
138 
Filellum serpens 
+ 
+ ’ 
Cryptolaria pulchella 
14-506 
* Cryptolaria symmetrica 
I 
13-225 
* Cryptolaria operculata 

138 
* Sertularia snyderi 

59-163 
Sertularella lata 

44-134 
Sertularella dentifera 
+ 

129-293 
* Sertularella torreyi 

40-406 
* Sertularella crenulata 
i 
95 
Pasythea quadridentata 
+ 
4- 

Surface. 
Thuiaria fenestrata 
14-20 
* Diphasia palmata 
134 
Synthecium tubithecum 
4_ 
70-75 
Synthecium orthogonia 
14 
Plumularia corrugata 
+ 
122 
* Plumularia jordani 
:::::::::::::::::::: 
73-130 
Plumularia buskii 
+ 

? 
* Plumularia delicata 
66-495 
* Plumularia milleri 
95 
Monostamhas quadridens 
+ 
122-138 
* Monostaechas fisheri 
56-59 
*Antennella complexa 
30-134 
? Aglaophenia rigida 
4- 
52 
*Thecoearpus niger 
16-163 
Lytocarpus phceniceus 
4- 
52-387 
* Lytocarpus hawaiensis 
44-115 
* Lytocarpus balei 
47-155 
* Lytocarpus similis 
213 
* Halicornaria flava 
59-163 
* Halicornaria bryani 
213 
a This species and also Plumularia buskii were not in the collections secured by the Albatross. They are included here 
in order to make the record of distribution as complete as possible, being the only known Hawaiian species that were not 
secured by the Albatross. 
