454 REPORT OF COMMISSIONER OP FISH AND FISHERIES. 



Ascidians. 



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

 Doliolum, sp. ; summer, (A. Ag-assiz,) (446.) 



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

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

 Larvae of fixed Ascidians, (445.) 



RADIATA. 



UcMnoderms. 



Strongylocentrotus Drobachiensis, larvae, (447.) 

 Asterias arenicola, larva? ; evening, (447.) 

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



Acalephs. 



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



Lesueuria hyboptera, adult ; September ; day-time. 



Pleurobrachia rbododactyla, adult and young; January to May, 

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



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



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

 " ephyra " 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. N. Edwards.) 



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



Eucbeilota ventricularis, young medusae; evening. 



E. duodecimalis, medusa; July. 



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



Ehegmatodes tenuis, medusae ; September ; evening. 



Zygodactyla Groenlandica, medusae ; June to September ; day and 

 evening, (449.) 



iEquorea albida,, medusae; September; evening. 



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



Eutima limpida, medusae ; September; evening. 



Lafoea calcarata, medusae ; September ; evening. 



Nemopsis Bachei, medusae ; June to September ; evening. 



Bougainvillia superciliaris, medusae, April, May, June ; evening. 



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

 evening, (450.) 



Dysmorphosa fulgurans, medusae ; evening, (448.) 



Modeeria, sp., medusae. 



Turritopsis nutricula, medusae ; July to September ; evening. 



