INDEX. 



275 



'yroso ma'atlaniicu m'J ' triangulum " 256 



' "tuberculosum" 237 



"elegans" 200,201,235,237,241,257 



ellipticum 229, 



•231-233, 239, 249, 264, 255; pi. 

 23, figs. 18-20, pi. 33, fig. 44 



general description 199 



hybridum 229- 



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

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



" minimum " 237 



origin of 197 



operculatum 283-234, 



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

 ovatum... 200,201,235-236,261,264; pi. 25 



speciation 260 



species 196 



spinosum 200, 



201, 205, 208, 213, 214, 219-223, 

 264, 266; pis. 19-20, pi. 21, fig. 11 



verticillatum 205, 



212,225-227, 229, 235, 

 239, 264; pi. 21, fig. 

 12, pi. 22, fig. 13 



cylindricum 225, 



227-229,258,264- 

 266; pi. 22, figs. 

 14, 15, pi. 33, 

 fig. 43 

 xP. atlanti- 

 cum atlan- 



ticum 258 



Pyrosomata ambulata 195, 



197, 201, 203, 204, 206, 207, 215, 223,25S 



flxala 195,197,201-208,213 



Pyrosomidae 195 



origin and relationships 260 



relationships among Pyrosomidae 258-260 



renal organs 205 



reniform organ 222 



Ritter 199, 215, 216, 237, 239, 254, 264, 268, 270 



Salensky 203, 211, 268 



Sal pa 198, 207, 210 



virgula 214 



Salpidae 196,260,261 



Savigny, de 201, 238, 268 



Seliger 195, 



200, 204, 207, 211, 212, 234, 235, 237, 244, 264, 268, 271 



s ex organs 207, 208, 215 



sinuses (blood) 206; pi. 15 



siphon, oral 201 , 203 



South Polar Expedition 195, 235 



speciation of Pyroso ma 261 



species 196, 197 



delimitation of 198 



distinct in Salpa 196 



fluctuation of 196 



hybridization 196 



integradation 196, 197 



spermatozoa 208 



spines, embryonic 201 



of test 201 



spinosum, Pyrosoma 200, 



201, 205, 213, 214, 219-223, 264, 

 266; pis. 19-20, pi. 21, fig. 11 



stigmata 203, 204, 214 



stolon 209 



stomach 205 



taxonomy 198 



in Pyrosoma 196, 



198, 199, 213, 237, 238, 243, 244, 258-261 



tentacles, oral 203, 204 



test 200, 201, 203, 204 



cells 202, 261, 262 



denticles 201 



processes 201, 214, 261, 262 



testis 207, 208, 215 



triangulum, Pyrosoma atlanticum 227, 



256-257,260,264,266; pi. 29, fig. 36 



"triangulum," Pyrosoma 256 



"tuberculosum," Pyrosoma 237 



tunic fibres 202 



vessels 202 



Uljanin 203, 268 



United States Bureau of Fisheries 195 



National Museum 195 



Ussow 203, 268 



verticillatum, Pyrosoma 201, 



205,212,225-227, 229, 235. 239, 

 264; pi. 21, fig. 12, pi. 22, fig. 13 



cylindricum, Pyrosoma 225, 



227-239, 258, 

 264-266; pi. 22 

 figs. 14, 15, pi. 

 33, fig 43 

 XP. atlan- 

 ticum 

 atlanti- 

 cum . . . 258 



vessels, blood 206 



of tunic 202, 214 



virgula, Salpa 214 



viscera 202 



zoids 203 



arrangement 200, 201 



ascidio 202 



o 



