. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 44 V. J. MARTIN AND W. E. ARCHER. Figure 6. Crown stage. A distinct head region (HE), stalk (Si. and base (Blare evident. Perisarc material (arrows) covers the surface. The crown is 427 ^m tall, 125 pm wide in the apical crown region, SO ^m wide in the stalk region, and 166 pm wide at the base. Bar = 50 ^m Figure 7. Immature polyp. The head region consists of a conical mound, the hypostome(H), a mouth (arrow), and a ring of forming filiform tentacles (F). A stalk (S) connects the head to the base (B). The polyp is 340 /jm ta
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 44 V. J. MARTIN AND W. E. ARCHER. Figure 6. Crown stage. A distinct head region (HE), stalk (Si. and base (Blare evident. Perisarc material (arrows) covers the surface. The crown is 427 ^m tall, 125 pm wide in the apical crown region, SO ^m wide in the stalk region, and 166 pm wide at the base. Bar = 50 ^m Figure 7. Immature polyp. The head region consists of a conical mound, the hypostome(H), a mouth (arrow), and a ring of forming filiform tentacles (F). A stalk (S) connects the head to the base (B). The polyp is 340 /jm tall, 120/jni wide in the anterior hypostome region, 73 jim wide in the mid-stalk area, and 206 nm wide in the posterior base. Bar = 50 ^m. Figures. Primary polyp. The head is composed of the hypostorne(H), short capitate tentacles (C), and the longer filiform tentacles (F). A narrow stalk (S), covered by perisarc (arrow), extends from the head to the base (B) of the adult. Stolons (T) emerge from the base. The primary polyp is 50(1 ^m tall. 200 ^m wide in the crow n area, 70 fitn wide in the mid-stalk area, and 200 ^m wide in the basal area. Bar = 50 /urn. Figure 9. Enlarged head region of a primary polyp showing hypostome (H) with capitate (C) and fili- form (F)u-i v These tentacles are armed with nematocxtes (arrows). Bar = 50 ^m. Shortening planulu (Fig. 3). Once attached the apical planula end flattens and expands o\ er the substrate while the basal end contracts down towards the expanded api- cal pole. Thus the attached larva becomes short and fat. Disc (Fig. 4). Within 2 h of attachment the basal end of the larva has completely contracted and a round disc shape is formed. The animal appears as a small, flattened ball on the surface of the substrate: apical and basal ends. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
