328 APPENDIX. 



be stretched upon the hoop of a cask, and the whole 

 fastened to a long, light pole. From the height on 

 which we stand above the water, it is impossible to 

 perceive the smaller animals ; the best way there 

 fore to catch these is, to hold the net half in the 

 water, as if to skim off the bubbles of foam from 

 the surface ; then, after a few minutes, if the net is 

 drawn out, and the interior rinced in a glass of fresh 

 sea-water, one may frequently have the pleasure of 

 seeing little animals of strange forms swimming in 

 the glass. In the course of ten days, I obtained, 

 in this way, thirty-one different species of animals, 

 among which was a small Diodon, eight small crus- 

 tacea of forms almost wholly unknown ; a sea-bug 

 (Halobates micans) ; three species of Pteropodes, 

 closely allied to the Cliodora ; a small and remark 

 able Hyalcea; two new Janthince ; Firola hyalina, 

 Pyrosoma atlanticum, Salpa ccsrulescens, and another 

 unknown ; Porpita glandifera, and a new species of 

 globular form; a Velella; two new species of Aca- 

 lephes, of the same family as the Diphyes ; and 

 further Pelagia panopyra, and two other very small 

 species. When the sea was a little agitated on the 

 Brazilian coast, we frequently saw the large sea- 

 bladder floating on the surface ; here we also caught 

 with our net a new species of small Hyalcea, and of 

 the fin-footed Steira, which approaches the nearest 

 to the Limacina. 



Brazil has lately been visited by eminent natu- 



