Mr. Lubbock on two new Subgenera of Calanidse. 203 



1. Labidocera. 



Antenna antica maris dextra duabus serratis lamellis instructa. 

 Spina p-ehensilis, parva, rigido crini sirailis. Pes thoracicus 

 guintus sinister, parvus, ramum internum 2-articulatum, ad api- 

 cem annulatum gerens. 



Contains one species, Labidocera Darwinii, which was described 

 at length in the ' Annals and Magazine of Natural Histoiy ' for 

 Jan. 1853. 



2. Labidocera (Ivella). 



Antenna antica maris dextra tribus dentatis lobulis instructa. 

 Spina prehensilis, magna. Pes thoracicus quintus sinister, mag- 

 nus, fortis, ad apicem acutus et corneus, I'amuni internum non 

 gei'ens. 



Also contains one species, L. Patagoniensis, which will be de- 

 scribed presently. 



3. Labidocera (Iva). 



Antenna antica maris dextra quatuor dentatis lamellis in- 

 structa, tumidissima. Spina prehensilis, maxima, annulata. Pes 

 thoracicus quintus sinister, magnus, ad apicem tumidus, papillosus. 



This subgenus also contains as yet but one species, L. magna, 

 which comes from the South Pacific Ocean. 



I now proceed to describe Labidocera [Ivella) Patagoniensis, 

 only noticing those points in which it differs from the description 

 of the genus given in the ' Annals and Magazine ' for January 

 last. 



PI. X. fig. 1 represents the male, and fig. 2 the female. 



First pair of antenrus. These organs will be described in de- 

 tail, and compared with those of the other members of this group 

 in an appendix. 



Right male. Length J^ inch. The basal portion consists of 

 a number of obsolete joints, and is clothed with plumose hair ; 

 the next few joints are swollen, the apical one the smallest, and 

 provided with a two- or three-toothed lobe ; the next two joints 

 long and slender, each with a toothed lobe, of which the basal is 

 four-toothed, the apical three-toothed ; and the three last joints 

 small aud simple. Attached to the swollen portion is a pre- 

 hensile spine like that of Pontella. 



The second pair of antennce (fig. 3) is provided at the base an- 

 teriorly with a hemispherical lobe which bears one hair. The 

 basal joint was imperfect in the specimen which I represented in 

 my former papei*, and the lobe had been torn off. 



Inferior eyes. From the fact of spirits of wine removing all 

 the colour of the eyes in this family, it is very difficult to ascer- 



