132 Of the mentioned two species only P. Bergenskinimi has hith- erto been found in Denmark, while domestica is known from Eng- land, Holland and France. Change of names of tbree newly described species of Åphiochaeta. Through the kindness of Dr. H. Schmitz in Sittard my attention has been drawn to the faet, that three of the names used in my paper „New species of Åphiochaeta from Denmark" in this volume, p. 1, are preoccupied; these names are the following: A. longiciliaia 1. c. 11, used by Strobl, Wien. Ent. Zeitg. XVIII, 1899, 148; I alter the name of my species to perciliata: A. siihmanicata 1. c. 20, used by Malloch, Ent. News XXV, 1914, 175; I alter the name to manicatella ; finally A. fumipennis 1. c. 23, used twice, by Brues, Ann. Mus. Nat. Hung. V, 1907, 407, and by Enderlein, Stett. Ent. Zeitg. 1912, 37, the latter name altered to umhripennis by Brues, Psyche XIX, 1912, 136; I give my species the name fumicolor. 13—12-19.
Notes on the development and the larval forms of some Scandinavian Echinoderms. Introduction. By Dr. Th. Mortensen. (With 8 text-figures.) COXTENTS. I. Ophiura affinis Ltk. (?). II. Amphiura filiformis (O. F. Muller). HI. Brissopsis lyrifera 'Forbes\ IV. Stichaster roseus (O. F. Muller) (?). V. Antedon petasu.< Diiben & Koren\ VI. On the nervous system of Echinoderm larvæ. During a stay at the Swedish Zoologicai Station at Kristineberg, Fiskebåckskil, in August-September 1918 I had the opportunity of making some observations on the development of some of the Echi- noderms occurring there. A renewed visit to the said station from the end of July till the middle of September this year (1919) enabled me to continue these researches. My aim being to acquire a ful- ler knowledge of the development of the Scandinavian Echinoderms, and especially of the different larval forms, it will need continued researches, which will evidently require visits to different piaces on the Scandinavian coasts and thus occupy a rather long time. I have therefore deemed it reasonable to publish this preliminary notice of the results hitherto acquired. I beg to tender my sincere thanks to the authorities of the Swedish Zoological Station, Kristineberg: Professor Hj. Théel and Dr. Hj. Os ter gren for the cordial hospitality offered me and for their untiring efforts in satisfying my — I fear rather trouble- some — needs of material for my researches. The results were obtained partly by direct rearing of the larvæ in question, partly through combinations of known facts, e. g. the