862 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Gonosome . — Gonangia “subsessile, ovate, smooth, with an even, shortly tubulous mouth.” 
(Hincks.) 
Distribution .- — A specimen in the IT. S. Fish Commission collection at Woods FI ole bears the label: 
“E. by S., Sanket)^ light, 20 fath.” 
This species has always hitherto been placed in the genus Sertularia. Its strictly alternate 
hydrothecae, however, make it necessary to consider it a Sertulcirella in accordance with the definition 
given above. 
Sertularella tricuspidata (Alder). Fig. 61. 
( Sertularia tricuspidata Alder, ( at. Zooph. North and Durh., p. 21.) 
Trophosome. — Colony slender, branches alternate, divided into regular internodes, each of which 
bears an hydrotheca. Hydrothecae cylindrical, slightly curved, distant, with a 3-toothed margin and 
3-parted operculum. 
Gonosome. — Gonangia deeply ringed, ovate, with a constricted tubular neck and circular orifice. 
Distribution. — A specimen in the IT. 8. F. C. collection at Woods Hole bears the label “E. byS., 
Sankety light, 25 fath.”* 
Sertularella rugosa (Linn.). Fig. 62. 
( Sertularia rugosa Linn., Syst. Nat.., p. 1308.) 
Trophosome. — Colony minute, unbranched, or sparingly branched; internodes short, each bearing 
an hydrotheca. Hydrothecse fusiform, very deeply and conspicuously marked with annular corruga- 
tions; aperture quadrangular, rather obscurely toothed; teeth 4; operculum composed of 4 pieces. 
Gonosome. — Gonangia like the hydrothecse, but much larger. 
Distribution. — Noank, on piles of wharf. Off Watch Hill, 17 to 21 fathoms. (Verrill.) 
Sertularella polyzonias (Linn.). I’ig. 63. 
(Sertularia polyzonias Linn., Syst. Nat., p. 813.) 
Trophosome. — Colony branched in an irregular manner, the branches alternate, but not equally 
distant, divided into regular internodes, each of which bears an hydrotheca; nodes oblique. Hydro- 
theca: swollen below, narrowing above to a margin with 4 shallow teeth and an operculum of 4 pieces. 
Gonosome. — Gonangia ovate, corrugated, with a short pedicel and quadrate aperture. 
Distribution. — “Off New London, 6 fath.; Gardener Bay, 6 to 8 fathoms; Block Island Sound, 17 
to 24 fathoms.” (Verrill.) 
