286 [Oct., 1845. 



his pigmento instructis ; antennis quatuor, anterioribus simpli- 

 cibus, in utroque sexu sequalibus et brevibus, posterioribus pre- 

 hensilibus ; pedibus duabus subcheliformibus, aliis octo nata- 

 toriis; ovario externo simplici. 



This genus includes minute marine Cyclopidae, none of them 

 exceeding a line in length, and mostly not over two-thirds of a 

 line. They are remarkable for the two large hyaline lenses 

 placed in the front of the animal, their compressed form, the 

 short and simple anterior antenna?, while the posterior pair is 

 prehensile, the presence of only two pair of prehensile legs, 

 which are succeeded by four pairs of natatory legs, similar to 

 those in other Cyclopidae. 



Posterior to the two large oblate lenses, wholly within the 

 animal, there are two oblong or prolate lenses, equally pel- 

 lucid and hyaline in appearance ; each situated behind one of 

 the former, though remote from them, and separated by an 

 open unobstructed space. At the posterior extremity of each 

 of the inner, there is a long mass of pigment of an oblong shape, 

 usually of a crimson or blue color, so deep as to be almost 

 black. The structure here presented is so remarkable, that it 

 may be unsafe to offer any conjecture as to the nature of the 

 organs described. Yet after examining hundreds of spe- 

 cimens, I may express an opinion that we have in these animals 

 a pair of eyes, each xoith two lenses. It is known that in water 

 animals the crystalline lens is usually spherical. But here we 

 have an oblate and prolate spheroid combined for the same 

 result. The genus Sapphirina, of Thomson, affords other ex- 

 amples of the same character, waich will be the subject of 

 remark at a future time. 



ELECTION. 



Jacob C. Tremper, Esq., of Yates Co., New York, was 

 elected a Correspondent of the Academy. 



