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Isoinelra vivipara Morlonsoii ; (levclopiuenL described, the present author, 



1920. 

 Conipsonu'lru seirata (A. H. Clark); part ol' the development described, 



the present author, 1920. 

 Tropiomctra carinala (Lamarck); reaied through metamorphosis, tiie pre- 



senl author (1916), 1920. 

 Notocrinus oirilis Mortensen; larva described, the present author, 1920. 



In the present memoir are given, besides additional observations on 

 the fieveloj)nient of I he following species: Slroiufylocenlrolus franciscanas, 

 Lylcrhinus iHiricydlns, Tripiwiisles esrulenliis and Pcionella Lesuciiri, obser- 

 vations on Ihe developmenl and the larval form of the following species, 

 which were hitherto entirely unknown as regards their development: 

 Phyllacanthiis purvispiniis Woods; cleavage and gastrulation only. 

 Euridaris Thoiiarsi (Val.); reared to beginning pluleus. 

 Arbacia stellala (lilv.); pelagic larva identified. 

 Diadema anlillarum Fhil.; reared to first larval stage. 

 Astwpijija pulvinata (Lamk.); reared to first larval stage; pelagic larva 



identified. 

 Tripneiistes </ratilla (Linn.); reared to first larval stage. 

 Lylechinus (iiiamesas 11. L. CJark; reared to full larval shape. 

 Lylechinus picUis (Verrill); reared to first larval stage; fully formed pelagic 



larva identified. 

 Lylechinus panamensis Mrtsn.; reared to first larval stage. 

 Lytechiiiiis Dcrruculatus (Ltk.); reared to first larval stage. 

 Toxopneustes pileohis (Lamk.); reared to first larval stage. 

 To.vopneiistes roseus (A. Ag.); reared to (irst larval stage; pelagic larva 



of more advanced stage identified (not beyond doubt). 

 Pseudoccntioliis (Icprcssiis: ivared to first larval stage. 

 Slronyylocculiolus pidchcrrimiis (A. Ag.); reared to nearly full larval shape. 

 Temnoplcuius IdininKiliciis (Klein); reared to nearly full larval shape. 

 Tcmnolrema sculpid .\. Ag. ; reared to nearly full larval shape. 

 Mcspilid (ilohuliis (Linn.); reared to full larval shape. 

 Evechinus chlorolirus (Val.); reared to full larval shape. 

 Heliocidaris luheiridalus (Lamk.); reared to full larval shape. 

 Heliocidaris erylliroyidmiiKt (\'al.); reaicd lin'ough metamorphosis. 

 Echinomelra lucunler (Linn.); reared through metamorphosis. 

 Echinonu'lid (ihhiKja (Blv.); reared to nearly full larval shape. 

 Echinomclid Mdllui'i (Hlv.): reared to first larval stage. 

 Echinoimira van Bninli \. Ag. : reared to first larval stage. 

 Colobocentmlus alralus (Linn.); i eared to nearly full larval shape. 



3 



