274 



INDEX. 



Fish Hawk 255 



fixata, Pyrosomata 195, 197,200-20-:. •_> i:j 



fluctuation of forms of Pyrosoma 193 



ganglion 206, 214 



general considerations 258 263 



German Deep-Sea Expedition 195, 225, 233, 256 



Plankton Expedition 234 



South Polar Expedition 1 15,235 



"giganteum," Pyrosoma 237 



giganl um, Pyrosoma atlanticum 200, 



290,237,241,251-255,257,264,205; pi. 30 



gland, intestinal 205 



subneural 206, 214 



Grobben 203,206 



hawaiience, Pyrosoma atlanticum 237, 



246-248, 265, 266; pi. 28, fig. 34, pi. 35, fig. 49 



heart 206 



Heider 210,267 



Herdman 219, 235, 240, 253, 254, 260, 264, 207 



Hunter 203,267 



Huxley 228, 237, 238, 244, 267 



hybridization . 196,197,198,246,251,258,259,261,266 



in Opa'.ina 198 



hybridum, Pyrosoma 225), 



232,239,264-266; pi. 23, 

 figs. 16-17, pi. 36, fig. 54 



individuality and form control 261 



intergradation of species 196-198, 261 



" intermedium," Pyrosoma atlanticum 197, 



237, 259, 266 



intestine 205 



Joliet 203, 267 



Julin 267 



Keferstein 200, 203, 



Korschel t 210, 



Kowalevsky 209, 210, 



Kruger 223, 257, 



"laevatum," Pyrosoma 



languets, dorsal 



Lesueur 195, 237, 238, 241, 257, 



longitudinal folds of branchial lamellae 



luminosi ty 



luminous organs 206, 207, 



material studied 195, 



Metcalf 197, 214, 260, 



"minimum," Pyrosoma 



molgula 



mouth 



2.;; 

 267 

 267 



21';? 



237 

 204 

 267 

 204 



195 



2!! 



L96 

 267 

 237 

 203 

 203 



muscles 215 



circum oral 203 



cloacal 202, 203, 215 



lateral system 203, 215 



of diaphragm 200 



of vessels 202 



of zooids 202, 203 



mutation 196-198, 261 



Naples Zoological Station 257. 2"s, 266 



National Museum, I cited States 195 



Nerctina virginea 197 



nerves 206, 214 



of oral tentacles 203 



Neumann 1S5, 



203, 211-214, 216, 224 227, 233 

 235, 2;;, 2,1,, 264, 2H7,270,27i 

 occurrence of two or more species together . . . 266 

 Oka j 



Page. 



Opa'.ina 198 



operculatum, Pyrosoma 233 



234, 239, 264; pi. 24, figs. 21-23 



oral siphon 201, 203 



sphincter muscles 203 



orientation of zooids 200 



ori^i n of Pyrosomidae 197 



"otoliths" 203 



ovary 207, 208 



01 ai m, Pyrosoma 200,235-236,261,264; pi. 25 



ovum... 208,215 



paradoxum, Pyrosoma atlanticum 208, 



237,248-249,265; pi. 29, fig. 35 



Perez 223, 264, 266 



peribranchial chamber 202, 205 



peripharyngeal bands 203, 204, 214 



Peron 195,237,268 



pharynx 202, 203 



phosphorescence 195 



pigment 206, 224 



Plankton E xpeditiou 195, 234 



processes (test) : 201,214,261,262 



pylorus 205 



Pyrosoma agashi 205, 



206, 213, 215-219, 262, 264, 

 266; pis. 10-18, pi. 33, fig. 42 



ahernoisum 200, 



201, 212, 213, 234-236, 

 264; pi. 24, figs. 24, 25 



■ •licum 197, 



198, 201, 204, 205, 226, 

 236,237-239,258,260, 

 261, 264, 266; pi. 15 



atlanticum 199, 



238,239-246, 265; 

 pis. 26-27, pi. 28, 

 fig. 33, pi. 34, figs. 

 45-46 

 XP '• atlanticum 

 lormn dipleu- 

 rosoma. . . 246,258 

 XP. vertkiibi- 

 tum eylindri- 



ctim 258 



echinatum 237, 



257-258, 264, 266; 

 pi. 31, pi. 35, rig W 



forma dipleurosoma 197, 



•2 J9 251.258,204,265,266; 

 I>1. 32, pi. 34, figs, 45, 40 



giganteum 200 



209, 237. 241, 251 255, 

 257, 264, 265; pi. 30 



hawaiiense 237, 



246-248, 264 200; pi. 

 28, fig. 34, pi. 35, fig. 49 



"intermedium " 197, 



237, 252, 259, 266 



"laevatum " 237 



paradoxum 208, 



237, 248 249, 259. 



264, 265; pi. 29, fig. 35 



subspecies. 240; pi. 36, figs. 50-53 



triingulum 237, 



•256 257, 200, 264, 

 266; pi. 29, fig. 36 



