Medusae of the world . ew of manubrium and radial-canal. CharlestonHarbor, South Carolina, September, 1897. Figs. 2 to 2. Blackfordia manhattensis. Figure 2, part of the bell-margin,showing the projections from the tentacle-bulbs extending intothe gelatinous substance of the bell; figure 2, lithocyst; figure2, portion of gonad. Off Sandy Hook, New York Harbor,October 16, 1904. See page 277. Fig. 3. Blackfordia virginica. Aboral view looking down upon the manu-brium of a male medusa. See page 277. Fig 4. Blackfordia virginica. Part of the bell-margin showing the ento-dermal diverticula of the t
Medusae of the world . ew of manubrium and radial-canal. CharlestonHarbor, South Carolina, September, 1897. Figs. 2 to 2. Blackfordia manhattensis. Figure 2, part of the bell-margin,showing the projections from the tentacle-bulbs extending intothe gelatinous substance of the bell; figure 2, lithocyst; figure2, portion of gonad. Off Sandy Hook, New York Harbor,October 16, 1904. See page 277. Fig. 3. Blackfordia virginica. Aboral view looking down upon the manu-brium of a male medusa. See page 277. Fig 4. Blackfordia virginica. Part of the bell-margin showing the ento-dermal diverticula of the tentacle-bulbs which penetrate into thegelatinous substance of the bell. Fig. 5. Blackfordia virginica. Gonad and manubrium of a mature Harbor, Virginia, November 7, 1904. Fig. 6. Eucheilota duodccimalis. Agassiz. Laboratory, Newport, RhodeIsland, August 8, 1892. See page 283. Fig. 7. Pseudochtia pcntata. Oral view of the manubrium showing the 5 lips720 apart. See page 278. Drawn from life, by the LEPTOMEDUS.^—PHIALUCIUM. 275 The species are all closely related and are characterized by their large, urn-shaped, 4-sidedstomachs and recurved lips with folded margins. Maas established the genus with P. virens = Oceania virens Bigelow as a type. Thefirst described species appears to be P. mbengha —Mitrocoma mbengha Agassiz and Mayer,1899. The species are closely related one to another and had best be described in tabular formin order to present their differences most clearly. Synopsis of the Species of Phialucium*. Shape and size of bell in mm. Number of well-developedtentacles. Number of rudimentarytentacle-bulbs. Length of largest tentacle interms of bell-radius (r). Number of marginal lithocysts. Number of concretions in eachlithoiyst. Shape and size of stomach. Position and character ofgonads. Color. Where found. P. carolinae= Oceania Caro-lina? Mayer, 1900. Somewhat flatter than a hemi-sphere, 14 wide. 16 62 Urn-shaped, with 4 recurvedlips with folded
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