6 MEMOIR I. 



penultimate joints of the tail with a short adpressed spine 

 on each side; the other projections seen in the figure at 

 the sides of the body and tail, are probably parts of the 

 bent up members of the animal ; it was quite transparent, 

 and occasionally luminous and scintillating by night. The 

 second species, taken August 22, in S. Lat. l/o 30", W. 

 Long. 1°30" and figured Plate I. fig. 4. a. and h. was like the 

 former discovered by its luminous scintillations in the dark, 

 and when examined next day, it appeared to have no spines 

 strictly to be called lateral, or dorsal; the anterior spine is 

 short, as in the former, and posteriorly, the corselet ends 

 apparently in three short spines ; the tail being bent up 

 close under the breast of the animal Avas not observed ; 

 the setse which terminate the feet, were very long and 

 feathered : this may probably be the second species of 

 which Bosc appears to have had a glimpse, and which he 

 describes as being black and Avithout any dorsal spine. 



Up to the year 1822, these were all the Zoeas known to 

 Naturalists, who, while they agreed as to their being 

 Crustacea, could not determine the place they ought to 

 occupy in that Class. Slabber referred them to the Mo- 

 noculi ! although so obviously provided with a pair of 

 extremely large and distant eyes : most of our contemporary 

 Naturalists of the greatest discrimination, still associate 

 them with the Entomostraca, an order formed out of the 

 Linnsean Monoculi ;* others, not less puzzled by the asso- 

 ciation of characters belonging to widely separated groups, 

 have preferred approximating them to the more perfect 

 Crustacea, thus Boscf places them at the head of the 

 edriophthalma (onisci &c.) and considers them to be inter- 

 mediate between these, and the podophthalma (lobsters, 



• Latreille, Hist. Nat. desCrust.&c.Sonnitii's edit, of Buffon, 1802, and in his 

 Genera Crust, et Insect. 1807. Dumeril, Zoolofjie analytique, 180(i. 



Cuvier, Regne Animal, 1817. Lamarck, Animaux sans Vert^bres, 1818. 

 t Hist, des Crust, Castel's edit, of Buffon. 



