No. 413.] WORTH-AMERICAN INVERTEBRATES. ` 393 
each joint. Hydrothecz tubular, closely appressed, arranged in rows along 
the pinnz, and with plain oblique aperture. 
Gonosome: Gonangia ovate, tapering toward the base, and with a 
tubular orifice. 
Habitat: Shells, stones, etc., generally distributed 
from Grand Manan, Massachusetts Bay, and south- 
PLUMULARID&. 
Synopsis of genera. Modified and 
condensed from Nutting’s Mono- 
graph of the Plumularide. 
ANTENNULARIA. Colony more or 
less arbuscular, stem simple or branch- 
Fic. 29. — Hydrallmania falcata Linn verticillate or scattered ; hydrothecae 
eui praagi. cup-shaped ; nematophores trumpet- 
shaped. Gonangia borne in axils of branches, unilateral. 
Monasta&cuas. Colony dichotomously branched, stem not fascicled, 
hydrocladia arising from upper sides of branches, otherwise resembling 
Plumularia, from which it differs in the entire absence of cauline hydrothecz. 
Gonangia oval in shape and with terminal aperture. 
ScHIzoTRICHA. Colony branching, branches pinnately arranged, hydro- 
cladia often forked. Gonangia borne on stem or hydrocladia. 
CLADOCARPUS. Stem simple or fascicled. Nematophores not trumpet- 
shaped, definitely fixed to hydrothecae or branches. Gonangia borne on 
stem or hydrocladia. 
Antennularia Linn. 
1, Antennularia antennina Linn. (FIG. 30). 
Trophosome : Colony growing in dense clusters of upright stems, often 
eight to ten inches high, 
Stems simple or sparingly 
cai obscurely jointed, 
each internode bearing a 
Gonosome: Gonangia 
9vate, borne singly in axils 
of hydrocladia. Aperture Fic. go.— Antennularia antennina Lim. Portion of 
subterminal. stem and hydrocladia (enlarged). (After Nutting) . 
