. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 314 J. E. PURCELL thread = shaft capsule. vj A FIGURE 2. Discharged and undischarged nematocysts from siphonophore tentacles. A. Microbasic mastigophores (heteronemes). B. Stenoteles (heteronemes). C. Holotrichous anisorhizas (haplonemes). D. Holotrichous isorhizas (haplonemes). E. Anacrophore (rhopalonemes). After Iwanzoff(1896). Suborders Calycophorae and Physonectae Each of the species examined in these suborders had nematocyst batteries that contained numerous haplonemes of one type in the cnidoband and several larger he
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 314 J. E. PURCELL thread = shaft capsule. vj A FIGURE 2. Discharged and undischarged nematocysts from siphonophore tentacles. A. Microbasic mastigophores (heteronemes). B. Stenoteles (heteronemes). C. Holotrichous anisorhizas (haplonemes). D. Holotrichous isorhizas (haplonemes). E. Anacrophore (rhopalonemes). After Iwanzoff(1896). Suborders Calycophorae and Physonectae Each of the species examined in these suborders had nematocyst batteries that contained numerous haplonemes of one type in the cnidoband and several larger heteronemes of one type, and 1 or 2 types of small nematocysts in the terminal filaments. The nematocyst battery structure was consistent within each suborder, but sizes of nematocysts differed among species (Tables I and II). The ranges of nematocyst sizes within species in Tables I and II result from the fact that small specimens within a species had fewer and somewhat smaller heteronemes than large specimens. This fact may explain differences in measurements made by other authors, as follow. An increase in the cnidoband length with siphonophore size was also noticeable in Ste- phanophyes superba, Athorybia rosacea, Forskalia edwardsi, and Agalma spp., where specimens spanning a large size range were available. Large specimens were used in calculations of the numbers of anisorhizas (haplonemes, Tables I and II) and volumes of the heteronemes (Table IV). The nematocyst batteries of the calycophoran species within the families Sphae- ronectidae, Diphyidae, and Abylidae were alike, having a long, straight cnidoband (Fig. 4A, I, L); those of the families Hippopodiidae and Prayidae were more rounded (Fig. 4C, E). The holotrichous anisorhizas (haplonemes) (Fig. 3D, F, N) of the uncoiled cnidoband of calycophorans were classified by Weill (1934) in Eudoxoides (- Diphyes) spiralis (Bigelow, 1911) (22 X 6-32 X 7 jum), Hippopodius hippopus (= neapolitanus) (30 X 5 /urn), Rosacea (= Praya
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