XVIU 
OONTENTS. 
PAGE 
VII. Logan (George), Esq., Report of the Committee on Marine 
Zoology. (Specimens were exhibited), . . 442 
VIIL Thomson (Murray), M.D., and Binney (Mord), Esq., On 
the Composition of a Pseudo-Steatite, . . . 445 
IX. Brown (Robert), Esq., Exhibited a small Foetal Specimen 
of a Narwal, ...... 447 
LIST OF ILLUSTRATIONS. 
PAGE 
Plate XIII. — Anatomy of Sacculina, .... 306 
Plate XIV. — 1-4, Hydractinia areolata ; 5-7, Atractylis are- 
nosa, ...... 314 
Plate XV. — 1-6, jEquoria vitrina^ . . . .316 
,, ,, 7-10, Atradylis arenosa, miniata, Laomedea deci- 
piens, ...... 349 
Plate XVI.— New Form of Holothuria, . . . .331 
Plate XVII. — 7, 8, Acharadria larynx, .... 378 
1-6, Vorticlava Proteus, .... 439 
Plate XVIII. — Zooteirea religata, .... 378 
Plate XIX. — 1, Zooteirea religata ; 2, 3, Freya producta ; 
4, F. ohstetrica ; 5, 6, F. stylifer ; 7, 8, Oxy- 
tricha longicaudata, .... 381 
Plate XX. — Ophiocoma hellis, 0. gramdata^ . . . 382 
Plate XXI. — Meteoric Iron, from Roxburghshire, . . 396 
Plate XXII. — Trichydra pudica, . . . . ~ 440 
Electro-cuts — Impression of Etched Surface of the Meteoric Iron, 405 
,, Impressions of Etched portions of the Meteoric Iron, 413 
Woodcut — Section of Sand-pit, Junction Road, Leith, . . 422 
