I also shot this afternoon three Cape pigeons (Procellaria capensis) white underneath, spotted black and white above. FIRST SPECIMEN--Female. Temperature, 98 1/2 degrees. Length from tip to tip of wing, 2 feet 11.3 inches. Length from tip of tail to tip of beak, 1 foot 6 inches. Length from tip of beak, 1.5 inches. Length from root to tip of tail,4.1 inches. Length of foot, 2.3 inches. Breadth across body, 3.2 inches. SECOND SPECIMEN. Length from tip to tip of wing, 2 feet 5 inches. Length from tip of tail to tip of beak, 1 foot 5 inches. Length from tip of beak, 1.5 inches. Length from root to tip of tail, 4 inches. Length of foot, 2.3 inches. Breadth across body, 3 inches. THIRD SPECIMEN--Female. Length from tip to tip of wing, 2 feet 5.5 inches. Length from tip of tail to tip of beak, 1 foot 4.6 inches. Length from tip of beak, 1.3 inches. Length from root to tip of tail, 4.6 inches. Length of foot, 2.2 inches. Breadth across body, 3.4 inches. Two species of insects were found in these Cape pigeons. The only difference I have been able to observe between the male and female of these birds is, that the male has the black spots of rather a deeper hue. October 21. Latitude 38 degrees 15 south; longitude 35 degrees 53 minutes east. From a variety of observations I am able to bear testimony to the correctness of a fact that has been before noticed, namely, that the Medusae invariably live in families. This single circumstance is remarkable in connection with other points of natural history since it will tend to explain the reason of certain classes of Petrels (Procellariae) only visiting particular parts of the ocean. Sunday October 22. Latitude 37 degrees 44 minutes south; longitude 38 degrees 00 east. Caught two small animals, one closely resembling a small shrimp (Penaeus) but having the head covered with a most beautiful purple shield. I kept this alive in a jug. The other in size and appearance exactly like a purple grape (Hyalea) with a greenish tinge at one extremity surrounding an aperture, and a distinct aperture at the other extremity. It was 0.4 inches in diameter, and had the power of emitting a phosphorescent light. I have since this period found several varieties of this animal; which, when it expands itself, closely resembles an insect, and has little wings. Further on will be found a sketch of these animals in their expanded state. (See illustration Hyalea figure 1.) THE ALBATROSS (Diomedea exulans). We caught four of these birds yesterday, from which I made the following measurements: FIRST SPECIMEN. Weight, 19 1/2 pounds.