Outlines of zoology . Fig. 76.—Lucernaria.—After Korotneff. it may measure ^\ ft. across the bell, with tentacles 120 ft. is hermaphrodite, and has diffuse sperm sacs even uponthe arms. In the Rhizostomse, Cassiopeia and Pilema, the. Fig. -Diagram oi Lucernaria.—After Allman. C, Cavity of gut (ccelenteron); F., gastric fila-ments ; H., hypostome ; G., gonad ; r., tentacle ;c circumference canal. mouth is obliterated, and replaced by numerous small pores on thefour double arms. Lucernaria and its allies are interesting sessileforms which have been compared to sexual
Outlines of zoology . Fig. 76.—Lucernaria.—After Korotneff. it may measure ^\ ft. across the bell, with tentacles 120 ft. is hermaphrodite, and has diffuse sperm sacs even uponthe arms. In the Rhizostomse, Cassiopeia and Pilema, the. Fig. -Diagram oi Lucernaria.—After Allman. C, Cavity of gut (ccelenteron); F., gastric fila-ments ; H., hypostome ; G., gonad ; r., tentacle ;c circumference canal. mouth is obliterated, and replaced by numerous small pores on thefour double arms. Lucernaria and its allies are interesting sessileforms which have been compared to sexual Scyphistomas, that is, areregarded as persistently larval forms. TYPES OF CCELENTERA A SEA-ANEMONE. 159 Contrast between Medusoids (Hydromedusce) andMedusm (Scyphomedusce) Medusoids. (Craspedota.) Medusa. (Acraspeda.) The majority are small swimming-bells. A flap or velum (craspedon) projects in-wards from the margin of the bell. No tEeniolBej nor gastric filaments. A double nerve-ring around the margin. Naked sense organs either optic or audi-tory. They are usually^ derivedfrom the skin, but the auditory sacsmay be modified tentacles. Reproductive organs on the radial canalsor by the side of the reproductive cells are usuallyde
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
