NEW MARINE ISOPODS^ — MENZIES 127 



Cephalon.—yVidiQV than long, anteriorly with a very short triangu- 

 late median lobe and two triangulate anterolateral expansions. Eyes 

 dorsal, separated from lateral border a distance equal to their widths. 



Peraeon. — ^Anterior border of first somite slightly concave. Lat- 

 eral portions of first, second, and third somites directed slightly ante- 

 riorly, the fourth laterally, fifth to seventh slightly posteriorly. First 

 to third somites of similar length, fourth shortest, fifth to seventh 

 longest. Lateral border of first somite bilobate, anterior lobe pointed ; 

 posterior lobe laterally truncate and is twice the length of anterior 

 lobe. Lateral borders of second and third somites bilobate, lobes 

 with truncate lateral borders. Anterior lateral lobe of first three 

 somites separated from posterior lobe by a narrow V-shaped slit. 

 Lateral border of fourth somite unilobate, lobe with truncate lateral 

 border. Lateral borders of fifth to seventh somites similar, all hav- 

 ing slightly convex lateral borders. Epimera visible in dorsal view 

 between lobes of somites 2 and 3 and posterior and medial to the lateral 

 expansions of somites 4 to 7. Dorsolateral surfaces of peraeon with 

 very few setae. 



P7^on.— Posterolateral pleotelson borders lacking sharp angles; 

 posterior margin with a small median lobe. Lateral pleotelson border 

 with numerous large, 2-pointed setae ; posterior margin with scattered 

 setae. Pleotelson dorsal surface with few setae. 



First antenna.— Loc2itQ,A. on each side of rostral projection, composed 

 of a 4-segmented peduncle and a flagellum having 11 segments. First 

 peduncle article two times the length and width of second, third 

 article narrower and only slightly shorter than second, fourth article 

 about one-half the length of third. Last ten flagellar segments each 

 with a long ribbonlike sensory filament on ventromedial border. 



Second antenna. — About as long as body. Peduncle having six 

 segments; first two segments subequal in length, third as long as both 

 prior segments and bearing a large setiferous scale on lateral margin, 

 fourth segment about one-half the length of third, fifth and sixth seg- 

 ments subequal in length, each exceeding about two times the length 

 of third segment. Flagellum about twice the length of peduncle and 

 composed of about 54 segments. 



Maxillijjed. — With three coupling hooks. 



First maxilla. — Very similar to that figured for Janiralata rajata 

 (see fig. 22, e). 



Second maxilla. — Each of the two outer lobe lappets with four 

 denticulate apical setae. Inner lobe with about ten large setae and 

 many fine setae on margin and apex. 



Mandible. — Left mandible with incisive part having five teeth; 

 lacina with four teeth ; setal row with one seta at base of lacina and a 

 row of six setae proximal to the solitary one ; molar process with ex- 

 panded, denticulate tip bearing six narrow setae; palp composed of 



