CYCLOPOIDEA. 1041 



Family I. CALANLTME.* 



The relations of the Calanidae to the other Cyclopoidea it is unneces- 

 sary to dwell upon at much length, after the remarks already made, 

 and the illustrations given on Plates 70, 71. To this family belong 

 figures 21 to 41, Plate 70, of the anterior antennae; 50 to 55, Plate 70, 

 with 48, of the posterior antennae; 57 to 61 and 63, of Plate 71, the 

 mandibles or mandibular feet; 66 to 73, of the maxillae; 77 to 81, of 

 the maxillipeds; 82, 83, and 90 to 92, of the anterior feet; and the 

 various figures on the following Plates 72 to 82 illustrate farther their 

 general characters and structure. 



The cephalo thorax varies in its segments, as explained on page 1024, 

 and the number of joints is not a generic distinction ; an attempt to 

 use it as such would prove a vexation to science, besides dissevering 

 natural associations of species. In nearly all the genera, the number 

 of joints varies ; and in some cases it does not appear to be altogether 

 constant in a species. 



The front is rostrate and either acute or furcate, as in figures 9, 10, 

 11, Plate 70. Only a few species (Euchaetae) have the emargination 

 shown in the profile view in figure 11, Plate 70. The extremity is 

 usually furcate and the divisions are sometimes slender setiform, and 

 quite long. 



The eyes are of two kinds, the superior and inferior (page 1025) ; 

 the superior eyes are either united on a single point of pigment, as in 

 the Cyclops, or they are distant, with separate spots of pigment. Both 

 varieties are found among the Pontellae. 



The anterior antennae vary in number of joints from seven to 

 twenty-four (and perhaps twenty-eight), as explained on pages 1026-9. 

 They are alike in both sexes in some genera, and in others the right 

 has a geniculating joint and an enlargement, as in the figures referred 

 to on Plate 70, and also Plate 82, fig. 6 c. These organs are long, and 

 have no perfect flexion at any of the articulations excepting the basal, 

 and the geniculating joint in certain males. 



* The new species of Calanidee beyond, are briefly described by the author in tha 

 Proceedings of the American Academy of Arts and Sciences, for 1849, vol. ii. pp. 10 to 34. 



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