454 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Ascidians. 



Salpa Oabotti, adults and young ; August and September, (445.) 

 Doliolum, sp. ; summer, (A. Agassiz,) (446.) 



Appendicularia, sp., (like A. furcata ;) summer, (A. Agassiz,) (446.) 

 Appendicularia, sp., (like A. longicauda ;) summer, (A. Agassiz.) 

 Larvae of fixed Ascidians, (445.) 



radiata. 



Ecliinoderms. 



Strongylocentrotus DrobacMensis, larvae, (447.) 

 Asterias arenicola, larvse ] evening, (447.) 

 A. vulgaris, larvae j evening, (447.) 



Acaleplis. 



Mnemiopsis Leidyi ; February, July to September ; day-time, (449.) 



Lesueuria hyboptera, adult ; September; day-time. 



Pleurobracbia rliododactyla, adult and young; January to May, 

 July to September ; day-time and evening, (448.) 



Idyia roseola, adult; September; day-time, (451.) 



Cyanea arctica, adult; August, September; day-time. Young in the 

 "eplayra" stages; April; young of all sizes up to four inches across; 

 May, (449.) 



Aurelia flavidula ; August, September ; day-time, young ; May, (449.) 



Dactylometra quinquecirra, adult and young; July to September; 

 day and evening, (449.) 



Trachynema digitale, young; Wood's Hole, July 1; day-time. 



Tiaropsis diademata; Wood's Hole; April 17, (Y. K. Edwards.) 



Oceania languida, medusae ; June to September ; day-time. 



Eucheilota ventricularis, young medusae; evening. 



E. duodecimalis, medusa; July. 



Obelia, several species, medusae ; evening chiefly, (447.) 



Ehegmatodes tenuis, medusae ; September ; evening. 



Zygodactyla Grcenlandica, medusae; June to September; day and 

 evening, (449.) 



^quorea albida. medusae ; September ; evening. 



Tima formosa, adult; February, 1872; April 30, 1873, (449.) 



Eutima limpida, medns{ie; September; evening. 



Lafoea calcarata, medusie ; September ; evening. 



Nemopsis Bachei, medusae; June to September; evening. 



Bougainvillia superciliaris, medusie, April, May, June : evening. 



Margelis Carolinensis, medusjc ; August and September, chiefly in the 

 evening, (450.) 



Dysmorphosa fulgurans, medusae ; evening, (448.) 



Modeeria, sp., medusjB. 



Turritopsis nutricula, medusjxi; July to September; 



