HY DROIDS OF THE WOODS HOLE REGION. 
353 
Hebella calcarata (A. Ag. ). Fig. 56. 
( Lafma calcarata A. Ag., North American Acalephse, p. 122.) 
Trophosome. — Colony parasitic, almost always on Scrtularia cornicina, where it assumes a sym- 
metrical mode of growth, the main stem growing straight up the front of the host and giving forth a 
pair of hydrothecse immediately above each pair of the sertularian hydrothecae. Pedicels very short 
and slender. Hydrothecae large, curved outward, backward and upward; margin circular, entire. 
Hydranth with a conical hypostome and about 16 tentacles. 
Gonosome. — Gonangia very large, borne on pedicels between the pairs of hydrothecse. Medusae 
at birth deeply campanulate, with two long marginal tentacles, and others in course of development ; 
4 radial canals and yellow-spotted proboscis. 
Distribution. — Found attached to Zostera at Woods Hole by Mr. Walmsley. Vineyard Sound, 
1 to 8 fathoms (Verrill). 
This species was originally described by McCrady as a part of the sertularian on which it grows. 
Hebella pygmaea (Alder) MS. Fig. 44. 
(See British I-Iydroid Zoophytes, Hineks, p. 205.) 
Trophosome. — Pedicels springing direct from a simple creeping rootstock, very 
short, annulated. Hydrothecse minute, cylindrical, deep; aperture smooth, sometimes 
somewhat oblique, as in figure. 
Gonoso me. — U nknown. 
Distribution. — Found on a polyzoon off Nantucket; Sankety Light east by south; 
depth, 24 fathoms. (Vinal Edwards.) 
This minute species is identified with considerable doubt. 
44. Hebella pyg r- 
mxa (Alder) . 
CAMPANULINID/E (modified). 
Trophosome. — Colonies branched or unbranched. Hydrothecse borne on pedicels, tubular, ending 
in an operculum composed of converging segments. Hydranths with a conical proboscis. 
Gonosome. — Gonangia producing planulse, or free medusie. 
This family is here modified to include the 
genera Lovenella and Calycella, the former having 
heretofore been placed in the Gampanularidi e and 
the latter in the Lcifceidse. Both agree with the 
genus Campanulina in having hydrothecse with a 
segmented operculum and hydranths with a conical 
proboscis. 
Key to yenera of Campanulinidie of Woods Hole region. 
A. Colony usually branched. 
a. Hydrothecse large, subcylindrical, with 
a well-defined sinuous margin 
at base of segmented operculum Lovenella- 
a'. Hydrothecse much smaller, ovate in 
outline, the margin passing in- 
sensibly into the segments of 
operculum Calycella. 
A'. Colony not regularly branched. Hydro- 
thecse not sessile, tubular, often 
with reduplicated margins Opercularella. 
A". Colony not branched. Hydrothecse sessile, 
tubular Cuspidella 
LOVENELLA. 
Trophosome. — Colony branched. H ydrothecse 
deep, with a distinct sinuous margin crowned with 
operculum composed of several triangular segments 
which form a pointed covering to hydrotheca. 
Gonosome. — Gonangia borne on the stems. and producing free, bell-shaped medusae with 8 tenta- 
cles in two sets, and 4 lithocysts. 
F. C. B. 1899—23 
