. Fig. 18. A-D. Scrupocellaria frondis Kirkpatrick. A. Dry Tortugas. Basal view showing vibraculum and adjacent structures. B. Dry Tortugas. Frontal view. C. St. 1, Ascension Island. Young colony in slightly oblique basal view. D. Dry Tortugas. Ancestrula with rootlets and rudiments of first zooecium. Polypide omitted. a. ancestrula, axillary vibraculum, r. rootlet, s. seta, v. vibraculum, 1-4, first four zooecia. Vibracula (Fig. 18 A). Vibracular chamber not visible in frontal view of branch, longer than wide, with lateral rootlet chamber, whole structu
. Fig. 18. A-D. Scrupocellaria frondis Kirkpatrick. A. Dry Tortugas. Basal view showing vibraculum and adjacent structures. B. Dry Tortugas. Frontal view. C. St. 1, Ascension Island. Young colony in slightly oblique basal view. D. Dry Tortugas. Ancestrula with rootlets and rudiments of first zooecium. Polypide omitted. a. ancestrula, axillary vibraculum, r. rootlet, s. seta, v. vibraculum, 1-4, first four zooecia. Vibracula (Fig. 18 A). Vibracular chamber not visible in frontal view of branch, longer than wide, with lateral rootlet chamber, whole structure nearly circular, truncated distally by transverse vibracular groove. Seta long and fine. One small vibraculum in axil of bifurcation. Ovicells longer than wide, with a few pores connected by radiating sutures. Rootlets smooth. Remarks. The Discovery specimens agree very closely with the type and with the specimens from the Tortugas figured here. The branches of the lumen of the scutum are sometimes not quite so much recurved.
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