STATE GEOLOGIST. * 8^ 



some spec'es there is another pair beneath, with joined pigments. 

 Mandibles and maxillae elongate, carrying a palpus, which is fur- 

 nished with setae. Ova sac one. First pair of antennae long, 

 unappendaged; the right or neither having a geniculating joint. 

 Feet of the first pair never sub-prehensile at the end. 



The Calanidae are divided into three sub-families, only one of which has been 

 found to be represented in our locahty, lapwever, the classification will be indi- 

 cated. 



Sub-family 1. Calanin^. — Abdomen of moderate length, inferior pair of 

 eyes wanting. Right superior antennae of male without a geniculating joint. 

 Secondary antennae setigerous at the end. 



Genus 1, Calanus, Leach, Dana. 

 - Genus 2. Rhincalanus, Dana. 

 Ganus 3. Cetochilus, Goodsir. 

 Genus 4. Euchaeta, PhiUppi. 

 Genus 5. Undina, Dana, 



Sub-family 2. Oithonin^. — Abdomen" linear produced, scarcely shorter 

 than the cephalothorax. Inferior eyes wanting. Maxille digitate on the interior 

 margin. Superior antennae long, few-jomted; right male antenna not gemculate 

 nor movable in an angle. 



Sub-family 3. Pontellin^. — Abdomen of moderate length. Eyes some- 

 times of two kinds. Antennae long and, in all the genera but Acartia, having a 

 geniculating joint. Second antennae setae-bearing at the end. Posterior feet of 

 the male thick; the right prehensile. 



Genus 1. Diaptomus, West wood. 



Genus 2. Hemicalanus, Dana. 



Genus 3. Candace, Dana. 



Genus 4. Acartia, Dana. 



Genus 5. Pontella, {Pontia, Edwards). 



Genus 6. Catopia. Dana, 



Genus Diaptomus, Westwood. 



Bibliography. — Monoculus, Linnceus, Fabricius Jurine, etc. 

 Cyclops, Muller, Desmarest, Manuel, etc. 

 , Diaptomus, J.O. Westivood, Partmgton's Cycl. Nat. Hist., Ento- 



mologist's Text-book, 1838. 



W. Baird, Brit. Entomost., p. 219. 



J. D. Dana, Rep. Wilkes' Expl. Ex., p. 1045. 



Cyclopsina, M. Edwards, 1840. 



Philippi, 1843. 



Baird, Zoologist, i. 56: Trans. Berw. Clarb. 



Dana, Proc. Amer. Acad. Art and Sci. 



Omethina, Templeton, Trans, Ent. Soc, ii., 118, 1838. 

 Broteas, Loren, Kongl. ret. Akad. Handl., 1845, p. 436. 



Characters. — The smaller ramus of the secondary antennae six to seven jointed. 

 Maxillipeds scarcely less, often larger than the first pair of feet. 

 Posterior pair of feet in the male thick, the right prehensile, 

 those of the female long and different from the preceding pau-s. 

 Ova sac one. 



