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Show 192 MEDUSAE FROM BRITlSn COLUMBIA AND ALASKA. [June 16, EXPLANATION OF THE PLATES. PLATE XVII. Fig. 1. Codonium apiculum, sp. nov., p. 165. 2. Thaumantias cellularia, p. 172. 2 a. „ „ oral lobes expanded. 2 b. „ „ oral lobe contracted. PLATE XVIII. Fig. 1. Tunis breviconis, sp. nov., p. 170. 2. „ „ view of oi-al surface. PLATE XIX. Fig. 1. Mesonema victoria, sp. nov., p. 180. 1 a. „ „ portion of bell-margin. 2. „ „ oral surface. 3. Polyorchis minuta, sp. nov., p. 174. PLATE XX. Fig. 1. Phialidium gregarium, p. 179. la. „ „ crossing of radial canals on stomach-roof. 2. Species incerta ?, p. 188. PLATE XXI. Fig. 1. Gonionemus agassizii, sp. nov., p. 185. 2. „ „ aboral surface. 3. „ „ section of bell, PLATE XXII. Fig. 1. Polyorchis minuta, sp. nov., p. 174. Transverse section of a gonad showing the continuation of the cavity of the radial canal into the gonad. 2. Mesonema victoria, sp. nov., p. 180. Section of bell-margin. cir.can.=circular canal of bell-margin. ect.papil.-excretion papilla. ve.=velum. 3. Gonionemus agassizii, sp. nov., p. 185. Attachment pad. 4. Codonium apiculum, sp. nov., p. 165. Section of bell-margin. cir.can.=circular canal. oc.=ocellus. ten.ba. =base of tentacle. ve.=velum. 5. Codonium apiculum, sp. nov. Section of stomach. |