• 



CYCLOPOIDEA. 2033 



61, each are two-jointed; in 62, one is one-jointed, and the other two- 

 jointed. 



By comparing the figures with those of the second pair of antennae, 

 and observing the numbers affixed to the joints (e. g. figs. 50 or 51 

 and 59), it will be seen that there are the same elements in both: 

 viz., a two-jointed base (the first joint mandibular), and two branches 

 of corresponding character. The difference consists mainly in the 

 basal joint. 



The mandibular feet when multiarticulate, are sometimes furnished 

 with many long setae at the extremity, and in other cases with only 

 one or two setae (fig. 63). There are many species in which only the 

 mandibular (basal) joint exists. 



First pair of maxillary feet or rnaxillce. — These maxillary feet are 

 oner- to four-jointed, and as in the preceding there is sometimes a lateral 

 branch. 



When of the most simple form, there is a single lamellar joint with 

 a lateral lobe, the whole edged about the apex and inner side with 

 minute hairs, as in fig. 64 ; or, there is a one- or two-jointed organ, with 

 a few short spines at apex (figure 65). 



Other forms, more complex in general appearance, are represented 

 in figures 66 to 73.* Figure 66 has three lamellar joints, of which 

 the apex of the first and one margin of the second joint are furnished 

 with spinulous setae for maxillary purposes. There are also on the 

 opposite apex of the first joint a cluster of long setae, and another 

 forms the apex of the third (or last) joint. In figure 67, the spinu- 

 lous maxillary setae belong all to the first joint; and from both apices 

 of the same, there are several long setae. The second joint is large 

 and simply lobed, and bears a number of setae in three clusters. 

 Figure 68 in the main resembles 67. The second joint bears two 

 others at apex, and on one side a single joint of another branch. Figure 

 69 is essentially like 68. Figures 70, 71, and 72, have the same 

 parts as the preceding. 



Thus among the above, two kinds may be made out ; one in which 

 the spinulous maxillary setae are confined to the first joint, and the 

 other in which they belong mostly to the second. The position of 

 these setae may be seen on Plate 75. 



* Figure 64, Plate 71, from a Corycams; 65, Sapphirina; 66, Euchfeta; 67, 68, 69 ? 

 Calanus; 70, 71, 72, Pontella; 73, Oithona; 73 bis, Candace. 



