Dec. 7, 1888.] 



SCIENTIFIC NEWS. 



573 



would be difficult to find a pool that does not contain it, 

 and it is not an uncommon inmate of caraffes in country, 

 and perhaps even in town, hotels. A copepoda is a 

 somewhat pear-shaped animal, composed of from sixteen 

 to twenty somites or segments, having two pairs of 

 antennas, known as anterior and posterior, three pairs of 

 prehensile and masticatory or suctional mouth-organs, 

 and five pairs of swimming feet. The carapace, or shell- 

 covering, falls loosely over the limbs, the terminal por- 

 tion of the animal being the abdomen, which is composed 

 of from three to five segments. Attached to the latter 



Fig. 5. 



Fig. 6. Fig. 8. 



Fig. 



Fig 



Fig. 



Fig. 



Fig. 



Plate I. 

 Cyclops Puffini, I.C.T. 



1. Cyclops Puffini, I. C.T., female, 



2. Anterior antenna of do. 



3. Posterior antenna of do. 



4. Mandible of do. 

 ,. 5. Maxilla of do. 



Fig. 6. Anterior footjaw of do. 



Fig. 7. Posterior footjaw of do. 



Fig. 8. One of third pair swimming feet of do. 



Fig. 9. One of fifth pair swimming feet of do. 400 „ 



the female often carries external sacs containing ova ; 

 the larvae are immature when hatched, and go through 

 several metamorphoses before arriving at the adult 

 form. 



(Figs. 1-9). 



x 150 diams. 



250 „ 



250 ,', 



400 „ 



400 „ 



400 „ 



400 „ 



400 „ 



The eyes in most species are situated in the frontal 

 portion of the body, and generally appear as though one 

 only ; they are connected with the brain by nerves, and 

 are imbedded in a mass of pigment. 



Fig. 9. 

 Plate II. 



LlCHOMOLGUS SABELL/E, I.C.T. (FlGS. 



Lichomolgtts Sabellce, I.C.T., female, x 



Anterior antenna of do. 



Posterior antenna of do. 



Fig. 4. Anterior footjaw of do. 



Fig. 5. Posterior footjaw of do. 



Fig. 6. Posterior footjaw of male 

 Fig. 7. One of fourth pair of swimming feet 

 Fig. 8. One of fifth pair of do. 



Fig. 

 Fig. 

 Fig. 



1-8.) 



150 diams. 



250 



250 



400 



400 



400 



400 



400 



rnal 



The anterior antennae are used vigorously by the ani 

 in propelling itself through the water ; it is probable that 

 they also contain organs of smell, as is known to be the 

 case with ants and other insects. Copepoda abound 



