ISOPODS OF NORTH AMERICA. 



463 



as the width of the head. The second pair of antennae are longer than 

 the body. 



The lateral margins of the first segment are produced on either side 

 into two angulations; those of the second and third into two, with the 

 epimera produced into two-lobed angulations; those of the fourth into 

 two lobes, the small epimeral lobe or angulation between; and those 

 of the fifth, sixth, and seventh into one large upper lobe and one small 

 lower lobe. 



The terminal segment is produced backward at the sides into two 

 sharply pointed angulations, with a broad triangulate central lobe 

 between. The uropoda are longer than the terminal segment, the 

 outer branch being somewhat shorter than the inner one, and both 

 fringed with hairs. 



The first pair of legs are prehensile; the remaining pairs simple. 



Two specimens were collected by Mr. Heath at Monterey Bay, 

 California. 



Type. Cat. No. 22582, U.S.N.M. 



IOLELLA LIBBEYI (Ortmann). 



Jolanthe libbeyi ORTMANN, Princeton University Bulletin, XI, No. 3, 1900, pp. 



39-40. 

 Tole libbeyi ORTMANN, Proc. Acad. Nat. Sci. Phila., 1901, p. 157. 



Locality. Cape Alexander, North Greenland. 



" Length of body 8 mm. Rostrum about as long as the head, directed 

 obliquely upward. Head with one lateral angulation, directed for- 

 ward. Eyes elliptical. Segments of pereion dor- 

 sally smooth, without any spines or tubercles. 

 First segment lateral^ with two angulations, 

 both of them directed obliquely forward. Sec- 

 ond and third segments with four short angula- 

 tions, the anterior and posterior subequal, the 

 third the smallest. Fourth segment with two 

 angulations, the anterior directed forward, the 

 posterior smaller and directed a little backward. 

 Fifth, sixth, and seventh segments with a 

 large anterior and very small posterior an- 

 gulation. All the angulations of these seg- 

 ments are comparatively short. Pleon with two 

 bluntly triangular angulations on either side 

 of a bluntly triangular central portion. Uropods 

 about as long as pleon. styliform, outer 

 branch a little shorter than inner. Flagellum 

 of first antenna fifteen articulate; flagellum 

 of second antenna with more than oue hundred FIG. sis. IOLELLA 



. (AFTER ORTMAXN). 



and hity annulations. 



"In the wanting tubercles of the dorsal surface and the form of 

 the lateral angulations this species is related to the two species of the 



