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Show 172 MESSRS. L. MURBACH AND C. SHEARER ON [June 16, clearly distinguished. The radial canals are four in number, simple, and opening into the angles of the stomach. The stomach is short and broad, a short proboscis connecting it with the lobed mouth below. The gonad-masses are interradial. No gastral peduncle could be distinguished. Habitat.-Victoria Harbour, collected by Shearer. Discussion.-The single specimen was so badly preserved as to render certain identification almost impossible. It has been placed under H. mertensii, the form it seems to resemble most. This Medusa was first described by Lesson (24) under the name of Cyctnea bougainvillii. Brandt, five years later, described it from the drawings and manuscripts of Mertens under the name of Hippocrene bougainvillii Lesson, changing this again a year later to Bougainvillia macloviana. Lesson met with it at the Island of Soledad, while Mertens found it at St. Matthei Island, Behring's Strait. Agassiz reports this species from the region of Puget Sound, Port Townsend, and the Harbour of San Francisco. Hartlaub (20) has suggested that Agassiz is mistaken in identifying his species with that of Mertens on account of size. Agassiz states that his specimens were larger than B. superciliaris, while Brandt describes the species as the size of an " ordinary pea," B. superciMaris measuring some 8 m m . in height; this would make B. mertensii of Agassiz some 9 or 10 m m . in height. Hartlaub (20) has recently given an extensive description of the Heligoland species of Bougainvillia in the ' Meeresfauna von Helgoland.' B. LEPTOMEDUSiE. I. THAUMANTIDJE Gegenbaur. THAUMANTIAS Eschscholtz. 1. THAUMANTIAS CELLULARIA Haeckel (18, p. 129). (PI. XVII. figs. 2, 2 a, & 2 b.) Synonym Laodicea cellularia A. Agassiz. Specific description.-The bell is rather flat, 5 to 9 cm. broad by 2*5 to 3-5 cm. high, somewhat resembling Staurophora in appearance. The tentacles form a fine fringe around the bell-margin, being not more than a third of its diameter in length, coiled up to their oval spindle-shaped tentacle-bulbs, which are so numerous as to almost touch one another. The number of tentacles is about 340. In specimens preserved in formalin neither ocelli nor cirri are visible. In proportion to the size of the animal the velum is narrow and delicate, being only 5 m m. broad. The radial canals run from the circular tube of the bell-margin to the highest point in the roof of the stomach, where they cross |