ART. 17 



OX TEREESTEIAL ISOPODS LOHMAlsTDEE 



15 



Pleon not abruptly narrower than peraeon ; the first two segments 

 covered laterally by the last peraeon segment, lateral angles of the 

 third, fourth, and fifth segments well developed, terminal segment 

 short, with the apex broadly rounded. The first and second seg- 

 ments bear a single row of rounded tubercles. 



Pleopoda: In the male the first pleopod (fig. 4 c) has the basal 

 portion short and broad, the outer margin rounded. The exopodite 

 comparatively very small and triangularly heart-shaped. The 

 endopodite is long, gradually taper- 

 ing, slightly and evenly curved, 

 with the end pointing outwards. 



The second pleopod (fig. 4 d-f) 

 has the basal portion similar to 

 that of the first, the outer pos- 

 tero-lateral angle being produced 

 slightly triangularly, pointed at 

 the end and bearing a few short 

 setae. Its exopodite is considerably 

 larger than that of the first 

 pleopod and more irregular in 

 shape, its inner margin being- 

 fringed with fine setae and bearing 

 on its inner dorsal surface a number 

 of long plumose setae, as well as 

 two short spiniform setae at the 

 end, all of which are lacking in the 

 first exopodite. The endopodite is 

 two- jointed, the first joint being 

 short and broadly rectangular, the 

 second very long with the basal 

 half curved and gradually tapering, 

 the distal half forming a fine styli- 

 form process. 



The exopodites of the following 

 pleopoda (fig. 4 g-i-k) are similar 

 to those of the second but somewhat 

 more elongated, the fourth and fifth becoming by degrees smaller and 

 smaller. In the third exopodite the plumose setae are particularly 

 well developed (fig. 5 &) ; besides those in an oblique row on the 

 inner dorsal surface there are two setae at the outer margin (fig. 

 4 g). The proximal part of the outer margin is beset with short 

 transverse rows of fine setae like the inner margin, those on the latter, 

 however, being much longer. On the outer proximal and inner distal 

 part of the dorsal surface there are a number of small transverse 

 rows of fine setae (comb lamellae). 



Fig 5. — Detonella papildicoenis 

 (Richakdson). b. Plumose seta 



FROM THE INNER DORSAL SURFACE OF 

 THE THIRD EXOPODITE OP MALE ; C. 

 MERUS and ADJOINING PARTS OF THE 

 FIRST LEG OF MALE^ WITH LAMELLAE ; 

 d. DACTTLDS of THE SEVENTH LEG OF 



MALE ; e. Inner margin of the peopo 



DUS OF THE FIRST LEG 



