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THEENTEROPNEUSTA.By R. C. Punnett, M.A., Fellow of GonviUe and Caius College, and Demonstratorof Comparative Anatomy in the University of Cambridge.(With Plates XXXVII.—XLVI. and Text-figs. 120, 121.)CONTENTS.Introduction, p. 631. Systematic account, p. 631. Some anatomical points, (1) the pygochord,p. 659, (2) the lateral septa, p. 659, (3) the branchiae, p. 660. The formation of the gonads,p. 660. Variation in Ptychodera fiava, p. 662. Metamerism in the Enteropneusta, p. 669.INTRODUCTION.The collection of Enteropneusta brought together by Mr Stanley Gardiner is the mostextensive hitherto made in any single locality, not only in the variety of forms, but also inpoint of numbers. To Mr Gardiner's recognition of the importance of collecting considerablenumbers and to his perseverance and zeal I owe this opportunity of making someobservations on the variation shewn by the genus Ptychodera, a field hitherto unexplored.The material is on the whole excellently preserved, and I would here express my thanksto Mr Gardiner for entrusting to me so interesting a collection. I am also greatly indebtedto Mr Forster Cooper for the coloured sketches from life which form the first plate to thispaper. With the account of the Laccadive and Maldive forms I have incorporated a descriptionof an interesting new form kindly placed in my hands by Mr Crossland, who collectedit in Zanzibar. Many regenerating specimens occurred in Mr Gardiner's collection. TheseI hope to make the subject of a subsequent paper.Fam. 1. Harrimaniidae.Fam. 2. Glandicipitidae.Spengelia porosa, Willey, 1898 ..........SYSTEMATIC ACCOUNT.'(Not represented.)FAQE633Sp. maldivensis, n. sp.Collar relatively very short with cornua of nuchal skeleton extending toextreme hind end. Dorsal septum throughout collar. Medium proboscis septumvery short. Dermal pits very small. No median gonads in post-branchial region. 635'The classification adopted is that recently revised by Spengel.81—2