No. 437-| WORTH AMERICAN INVERTEBRATES. ee 
SYNOPSIS OF FAMILIES OF STAUROMEDUS&. 
I. ‘TESSERID#. Margin of umbrella devoid of definite lobes or anchors ; 
the umbrella at- 
tenuated at the 
apex into a hol- 
low stalk, which 
in some genera 
Sieiavielse, sash aya 
means of attach- 
ment; eight ten- 
tacles, four of 
which are perra- 
dial and four in- 
terradial. 
SOs tates as 
known no. rep- 
resentatives of 
this family come 
within our 
range. 
Fic. 1. Halichystus auricula Clark. 
II. LucerNArtp&. Margin of umbrella definitely lobed, each terminat- 
ing in tufts of delicate knobbed tentacles; exumbrella attenuated at the 
apex as an organ of attachment; margin of umbrella with eight tentacles, 
arranged as in previous family, but sometimes modified as anchors. 
KEY TO THE GENERA. 
A. Without gastrogenital pockets in the sub-umbrella wall of the radial 
pouches. 
1. Umbrella with 8 marginal anchors - . Haliclystus. 
2. Umbrella without marginal anchors . . Lucernaria. 
B&B. With four perradial gastrogenital pockets in the subumbrellar wall 
of the four radial pouches. 
3- Margin of umbrella with 8 anchors . . Halicyathus. 
Flaliclystus auricula Clark. 1863. 
Boe. 0: 
Haliclystus auricula, Clark, 1863, 1878. 
us ue A. Ag. 1865. 
& primula, Heckel, 1877. 
Lucennaria “6 u 1865. 
Haliclystus auricula, o 1880. 
