Bottle No. 2. Ligea. - 8 specimens. Common about the Harbor. Alpheus. - 3. Also found in cavities among the corals, near Osaya Banks. Philippia emerta. - From the sand beaches near Porto Alegre; also more abundantly on the S. side of the Harbor of Rio, near the entrance. More than 10 specimens. Alumna. - Found on the S. side of the Harbor, with the above Philippia. - 1 specimen. Gelatinarius. - 5 specimens. 3 males, 2 females. Found along a brushed, nearly fresh down-rush, beach of the City of Rio Janeiro, near the Alcoba. Bottle No. 2. Several minute specimens of Gammarus. - Nonathrae, J., from sea weed in the Harbor. Idotea. - Length 1/2 to 3/4 inch. Found in the Harbor of Rio. 1 specimen. Laelius (Dana) A new genus, allied to Idotea. 1 specimen. Found among the sea weed, along the shore of the Harbor near Bay Grand. Philoseis. - 5 specimens. Found under stones in the woods nearby. Hippolyte. - (or allied to it.) 10 specimens. Found with the above Gam- mari, &c., among the sea weed along the shore near Osaya Banks. Cetodelphus (Dana) gracilis, a new genus of the family Schizopoda, remarkable for carrying the embryo in a pouch un- der the posterior part of the abdomen, which is formed by the meeting of a pair of concave lamellae. Very abun- dant in the Harbor of Rio, near Hospital Island, and in various other parts. Upwards of 20 specimens. Caprella - vulgata (Dana) - Found with the Gammarus, &c., above referred to, near Osaya Banks. Very abundant. Caprella - catenata (Dana) Found with the above, not abundant. Caprella cornuta (Dana) - The same locality as above. Abun- dant. Both male & female. Caprella gracilis. (Dana) With the above. Not abundant. Caprella elongata. (Dana) Very long & slender. Abundant; found at the same place with the above species. In all there are about 38 specimens of the above Species of Caprellen preserved in the bottle.