282 E. W. MACBRIDE. 



13. Ltjdwig, H. — ' Bronu's Thierreich,' new edition, article " Echino- 



dermata." 



14. MacBbide, E. W. — " The Development of the Genital Organs, &c., in 



Amphiura squamata," ' Quart. Journ. Micr. Sci.,' 1892. 



15. MacBride, E. W. — "The Organogeny of Asterina gibbosa," 'Proc. 



B,oy. Soc. London,' vol. liv, 1893. 



16. MacBride, E. W. — " Review of Professor Spengel's Monograph on 



Balanoglossus," ' Quart. Journ. Micr. Sci.,' 1894. 



17. Perkier. — ' Memoire sur I'organisation et le developpement de la Coma- 



tula de la Mediterranee,' Paris, 1886. 



18. Seeliger. — " Studien zur Entwickelungsgeschichte der Crinoiden," 



' Zool. Jahrbiicher, Abt. fiir Anat. und Ontog. der Thiere,' Bd. vi. 



19. Semon. — " Die Entwickelung der Synapta digitata und ihre Bedeu- 



tung fiir die Phylogenie der Echinodermen," 'Jenaische Zeitschrift,* 

 1889. 



20. Semon. — "Die Homologien Innerhalb des Echinodermenstames," 



' Morph. Jahrbuch,' 1889. 



21. Spengel, J. W. — ' Die Enteropneusten des Golfes von Neapel und der 



angrenzenden Meeresgebieten ' (Fauna and Flora of the Gulf of 

 Naples), 1894. 



22. Theel. — " The Development of Echinocyamus pusillus," 'Trans- 



actions of E,oy. Soc. of Upsala,' 1892. 



EXPLANATION OF PLATES XI— XXII, 



Illustrating Mr. E. W. MacBride's paper on "The Develop- 

 ment of Asterina gibbosa." 



(The outlines of all the sections figured were drawn with the camera lucida.) 



List of Abbreviations used. 



a. Anterior body-cavity and the part of it persisting in the stalk, a'. Axial 

 sinus, ab. Aboral sinus, ab. gon. Dilatation of branch of aboral sinus round 

 the gonad. amb. Ambuiacral ossicle. amceb. Amoebocytes. a. oe. Adult 

 oesophagus or " stomach." B. Basal plate, bip. gang. Bipolar ganglion- 

 cells, branch. Dermal branchia. C. Centro-dorsal plate, calc. Calcigenous 

 tissue, ect. Ectoderm, end, Endoderm. fibr. Fibrous tissue, fix. Disc 



