ISOPODS OF NORTH AMERICA. 



463 



as the width of the head. The second pair of antennre are ionoer than 

 the body. 



The lateral iiiaro-in.s of the first segment are produced on either side 

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

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

 two l()l)es, the small epimeral lobe or angulation between; and those 

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

 lower lo})e. 



The terminal segment is produced backward at the sides into two 

 sharply pointed angulations, with a broad triangulate central lo])e 

 ])etween. The uropoda arc longer than the terminal segment, the 

 outer Iwanch ])eing somewhat shorter than the inner one, and l)oth 

 fringed with hairs. 



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



Two specimens were collected by Mr. Heath at Monterey Ba}', 

 California. 



Type.—Q^t. No. 22582, U.S.N.M. 



lOLELLA LIBBEYI (Ortmann). 



Jolanthe Uhhei/i Ortmann, Princeton University Bulletin, XI, No. 3, 1900, pp. 



39-40. 

 Tale Khbei/i Ortmann, Proc. Acad. Nat. Sci. Pliila., 1901, j). 157. 



Locality. — Cape Alexander, North Greenland. 



' ' Length of body 8 mm. Rostrum about as long as the head, d i rected 

 obliquely upward. Head with one lateral angulation, diret't(Ml for- 

 ward. Eyes elliptical. Segments of pereion dor- 

 sall\' smooth, without any spines or tubercles. 

 First segment laterally with two angulations, 

 both of them directed obliqitely 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 comparativelv short. Pleon with two 

 hlunth' triangular angulations on either side 

 of a })luntly triangular central portion. Uropods 

 al)out as long as pleon, styliform, outer 

 branch a little shorter than imier. Flagellum 

 of first antenna fifteen articulate; flagellum 

 of second antenna with more than one hundred 

 and fifty 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 



Fig. .'tis.— ICILELLA 1.IBBKYI 



(After Ortm.-^ns). x ti. 



