VI BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Page 

 77-79. Salpa fusiformis, aggregated zooid 91, 92 



80. Salpa fusiformis, form aspera, solitary individual 92 



81. Salpa fusiformis, form aspera, aggregated zooid 92 



82. Salpa cylindrica, solitary form 95 



83-86. Salpa cylindrica, aggregated zooid 96-98 



87-89. Salpa cylindrica, aggregated form 98, 99 



90-96. Iasis zonaria, solitary form 102-105 



97, 98. Iasis zonaria, aggregated zooid 106 



99, 100. Iasis zonaria, aggregated form 107 



101 . Iasis zonaria, aggregated zooid 108 



102,103. Iasis zonaria, aggregated form 108 



104-106. Thalia democratica, solitary form 111-113 



107. Thalia democratica, aggregated zooids 115 



108-110. Thalia democratica, aggregated form 115-117 



111. Thalia democratica, aggregated zooid 117 



112. Thalia democratica, aggregated form 118 



113. Thalia longicauda, solitary form 120 



114-116. Thetys vagina, solitary form 122-124 



117. Thetys vagina, aggregated zooid 125 



118. Thetys vagina, aggregated form 126 



119-120. Pegea confederata, solitary form 131. 132 



121. Pegea confederata, embryo 132 



1 22. Pegea confederata, adult solitary form 133 



123. Pegea confederata, aggregated zooid 134 



124-127. Pegea confederata, aggregated form 135, 136 



128. Pegea confederata, subspecies bicaudata, oral muscles of either 



solitary or aggregated form, seen from within 140 



1 29. Pegea confederata, subspecies bicaudata, solitary form 141 



130. Pegea confederata, subspecies bicaudata, aggregated zooid 142 



131,132. Pegea confederata, subspecies bicaudata, aggregated form 142, 143 



133. Traustedtia multitentaculata, solitary form 147 



134. Traustedtia multitentaculata 149 



135, 136. Traustedtia multitentaculata, aggregated zooid 151 



137. Traustedtia multitentaculata, aggregated form 151 



138, 139. Traustedtia radiata, solitary form 153 



140,141. Apsteinia asymmetrica, embryo 183, 184 



142. Apsteinia asymmetrica, solitary form 185 



143. Apsteinia asymmetrica 185 



144. Apsteinia asymmetrica, solitary form 189 



145-147. Apsteinia asymmetrica, aggregated form 186-188 



148, 149. Apsteinia asymmetrica, adult aggregated form 188. 189 



150. Apsteinia asummetrica, aggregated zooid 189 



Pyrosoma: A Taxonomic Study Based upon the Collections 

 of the United States Bureau of Fisheries and the United 

 States National Museum 



By Maynard M. Metcalf and Hoyt S. Hopkins 



1. A colony of Pyrosoma atlanticum atlanticum 199 



2. A diagrammatic longitudinal section of a Pyrosoma colony 199 



3. A diagrammatic frontal section through a zooid of the elongated 



type, of Pyrosoma atlanticum 204 



