ISOPODS OF NORTH AMERICA. 



405 



.six more or less broken l)lack lines. The lines on the sides are more 

 distinet than those above. 



Head sub(iuadrat(>, partiall}^ iniuiersed in the lirst thoracic seg-ment 

 and rounded on the posterior niarj>-in; sides parallel, anterior niaro-in 



Fig. 452.— Cleantis planicauda (After Moore). «, General figpre. b, First antenna. 

 c, Second antenna, d, First leg. e, Fourth leg. /, Seventh leg. 



emarginate; a deep depression or groove runs from the median notch 

 to the center of the head. The eyes are situated near the antero-lateral 

 angle;, post-occipital lobe distinct; antennae with six seg- 

 ments; first very short and nearly immobile; second very 

 short and stout; the third segment is equal in length to the 

 second, but not so stout; the fourth and tifth are of equal 

 length and about one-third longer than the second and third 

 segments. The terminal segment or flagellum is lighter in 

 color, and is armed with short bristles. The 

 length of the antenna is equal to the length 

 of the head and first two thoracic segments. 

 The antennuhv extend to the middle of the 

 third segment of the antennie. The first seg- 

 ment is quadrate; the second subquadrate; 

 the third is pear-shaped; the fourth segment 

 is very small. Maxillipeds with the palp 

 composed of five articles. 



The segments of the thorax are nearly 

 equal in length and breadth, the third and 

 CLErsTis fourth being but little longer than the others. 

 plani- ^\^q epimera of tiie .second, third, and fourth 

 segments are very small and can not be seen 

 from above. On the fifth, sixth, and seventh segments the epimera 

 are large and project well behind the margin of the segment in the 

 form of an acute angle. 



The pleon is composed of four segments; the first three are very 

 narrow; the terminal segment is elongated with subparallel sides. A 



Fig. 4.')4.— Cleantis 

 planicauda. 



M a X I I. L I P E D . 



■ 20i. 



