CONTENTS. HI 



(II) Gen. MEYE>nA. 210 



(1) Meyenia erenaceus. 177, 211 



Si/n. Spongilla erenaceus ; TrocJiospongilla eren- 

 aceus. 177 



(2) Meyenia leidyi ; {Spongilh. le'idyi). 212 



(3) Meyenia gregaria; {Spongilla gregaria). 217 



(4) Meyenia niinuta. 218 



(5) Meyenia fluviatilis ; {Spongilla fluviatilis). 178, 219 

 Meyenia " v. meyeni; {Spongilla meyeni',) 221 

 Meyenia " v. acuminata. 222 

 Meyenia " v. mexieana. 222 

 Meyenia " v. angustibirotulata. 223 

 Meyenia " v. gracilis. 224 



Syn. Spongilla pulvinata ; Ephydatia Jiuviatilis ; 178 



Syn. Spongilla asperima, stagnalis, astrosperma, 



polymorpha. 219 



(6) Meyenia niiilleri, {Ephydatia mulleri). 177, 224 



Syn. Spongilla mulleri, Meyenia mulleri, Trachy- 



spongilla mulleri. Vil 

 Syn. Spongilla mirabilis; Ephydatia amphizona. Ill 

 Syn. Pleiomeyenia calumeticus, xvalkeri, spinifera. 224 



(7) Meyenia bohemica; {Ephydatia bohemiea). 179, 225 



(8) Meyenia robusta. 225 



(9) Meyenia millsii. . 225 



(10) Meyenia subdivisa. 226 



(11) Meyenia baileyi; {Spongilla haileyi). 227 



(12) Meyenia capewelli, {Spongilla capewelli). 228 



(13) Meyenia anonyma. 228 



(14) Meyenia ramsayi. 228 



(15) Meyenia crateriformis. 228 



(16) Meyenia everetti. 230 



(17) Meyenia plumosa; {Spongilla plumosd). 233 

 Meyenia " v. pabneri. 234 



(III) Gen. HETEROMEYENIA. 236 



(1) Heteromeyenia repens; {Spongilla repens). 237 



(2) Heteromeyenia argyrospernia ; {Spongilla argyrosperma). 239 

 Heteromeyenia " v. tenuis. 240 



(4) Heteromeyenia longistylis. 242 



(3) Heteromeyenia ryderi. 242 

 Heteromeyenia " v. pictovensis. 244 

 Heteromeyenia " v. walshii. 246 

 Heteromeyenia " v. baleni. 247 



(IV) Gen. TUBELLA. . 248 



(1) Tubella paulula ; {Spongilla paxdula). 248 



(2) Tubella spinata. 249 



(3) Tubella reticulata ; {Spongilla reticulata). 249 



(4) Tubella recurvata ; {Spongilla rectirvata). 250 



