Royal Physical Society. 253 



Mr Murray also exhibited a species of Tetraodon received from Old 

 Calabar, through the kindness of Mr Wylie. It did not correspond with 

 any of the species described by Lacepede, and was probably new. 

 Instead of being armed with great spines, it was nearly smooth, except on 

 the belly, where it was covered by a number of small prickles. It was 

 dark brown above, and pale beneath, and had a row of six deep red spots 

 along its sides. Mr Murray named it provisionally T. pustulatus. 



IV. Observations on British Zoophytes. 1. Laomedea acuminata. 2. 

 Trichydra pudica. 3. Tubularia indivisa. 4. Description of New 

 Protozoa. By Thomas Strethill Wright, M.D., Fellow of the 

 Royal College of Physicians, Edinburgh. 



Description of Plates. 



Plate XIII. 

 Fig. 1. Laomedea acuminata, highly magnified — a polyp with tentacles expand- 

 ed — b bud with growing polyp — c empty cell — d polyp disturbed — 

 e capsule containing medusoid. 

 2. L. acuminata, magnified two diameters, to show the branched and un- 

 branched states of the polypary. 



Plate XIV. — Laomedea acuminata. 

 Fig. 1. a bases of three tentacles of polyp united by their connecting mem- 

 brane, and studded with large thread-cells and masses of granules — 

 b unconnected portion of tentacles, furnished with small thread- 

 cells. 



2. Ideal section of capsule containing medusoid taken at an early stage — 

 *corallum, fectoderm, Jendoderm — a reproductive polyp — & me- 

 dusoid inclosed within c, a sac formed by a layer of ectoderm. Cir- 

 culation indicated by arrows. 



3 and 4. Medusoid of L. acuminata, compared with fig. 5, medusoid of 

 Campanularia Johnstoni — a tentacles — b rudimentary tentacles — 

 •c auditory capsules. 



Plate XV. 



Trichydra pudica. 



Fig. 1. Polyps— g e c in various stages of contraction — /with buccal cavity 

 everted — d b extended — a young polyp. 



Tubularia indivisa. 



2. Transverse section of polypary near the summit — a corallum— b ecto- 



derm — c endoderm pierced by e longitudinal canals. 



3. Summit of polypary from which the polyp has recently fallen — a lon- 



gitudinal spiral canals — b irregular transverse striae, indicating the 

 fall of successive polyps. Course of circulation marked by arrows. 



