CONTENTS. XVII 



Order II. Cymothoidea or Flabellifera Continued. Page. 

 Family XI. Sphaeromidpe Continued. 



Genus 48. Sphseroma 280 



Sphseroma quadridentatum 281 



destructor 282 



pentodon 286 



Genus 49. Exosphseroma 287 



Exosphseroma amplicauda 288 



rhomburum 290 



yucatanum 291 



faxoni 292 



octoncum 293 



thermophilum 294 



dugesi 295 



oregonensis 296 



crenulatum 298 



Genus 50. Dynamene 299 



Dynamene perforate, 299 



glabra ..< 301 



angulata 302 



moorei 303 



dilatata 304 



benedicti 304 



Genus 51. Paradynamene 305 



Paradynamene benjamensis 305 



Genus 52. Cilicsea 307 



Cilicaea linguicauda 309 



granulosa 309 



cordata 310 



gilliana # 313 



caudata 314 



sculpta 318 



carinata 319 



Family XII. Serolidse 320 



Genus 53. Serolis '.. 320 



Serolis carinata 321 



Order III. Idotheoidea or Valvifera 323 



Family XIII. Arcturidse 323 



Genus 54. Astacilla 323 



Astacilla granulata 324 



caeca 326 



Genus 55. Arcturus 327 



Arcturus beringanus 328 



longispinus 329 



glaber 330 



purpureus 331 



caribbseus 335 



floridanus . 336 



baffini 337 



baffini var. tuberosus 340 



Genus 56. Pleuroprion 342 



Pleuroprion murdochi 342 



intermedium.. 344 



