83 

 ADDENDUM ON NEBALTA. 



Hav[ng twice alluded to Nebalia in the previous Memoirs, 

 from its supposed relation to the animals which have 

 hitlierto occupied our attention, and from its being a type 

 almost unknown to the greater part of Zoologists, and 

 which it Avould be desirable to have thoroughly and per- 

 fectly scrutinized, the author has thought it adviseable to 

 re-produce the only good figures of the two described spe- 

 cies, and to repeat what has been communicated as to the 

 structure and habitudes of these anomalous Crustacea, in the 

 hope that Naturalists who may reside on or visit the coasts 

 where they are said to be found, may furnish more satis- 

 factory details, or submit specimens to the examination of 

 some competent micrographcr. 



The best informed Naturalists have associated Nebalia 

 with the Shizopodse from the circumstance of having their 

 members cleft or divided into two branches, and their 

 appearing to have a pair of pedunculated eyes ; when, 

 however, we are aware of all the anomalies which affect 

 the limbs and visual organs in the Crustacea, we shall not 

 be apt to attach much importance to characters derived 

 from parts liable to [such extraordinary deviations, when 

 they are not at the same time accompanied by some approx- 

 imation in the general form and structure to the rest of 

 the animals of the group ; this is by no means the case 

 with Nebalia, which in every other respect is an animal 

 sui-generis, but certainly bears a greater degree of affinity 

 to the Larvae of the Balani than to any other ; its antennae, 

 no doubt, constitute one difference, while its eyes and 

 tail are exserted beyond the boundary of the corselet, 

 differences which we might be prepared to expect in the 

 larvae of the various genera of the Balani : indeed, since 

 the discovery announced in the preceding Memoir, it is 

 difficult to dismiss a suspicion that Nebalia may be the 

 Larva of some one of those types, and in particular of 



