GENUS OF TEKRESTEIAL ISOPODA. 449 



narrows, remaining about the same width nearly to the extremity where it 

 narrows somewhat suddenly and has the apex pointing slightly outwards, 

 along its posterior margin it bears a groove. The male organ is short, 

 reaching only about halfway along the endopod, the distal third is narrowed 

 and it is slightly emarginate at the extremity. 



The second pleopod (fig. 40) has the basal portion and the exopod similar 

 to those of the first, except that the latei'al expansion of the former is 

 smaller ; the convex inner margin of the exopod is thickly fringed with 

 fine short setae ; the endopod is greatly narrowed and elongated and appears 

 to be divided into two joints, the basal one short and oblong, the terminal 

 one very long, nearly twice the length of the exopod, and ending in an 

 extremely fine styliform process — along the anterior surface of this joint 

 is a groove which appears to fit against the corresponding groove of the first 

 exopodj doubtless thus forming a tube for the passage of the semen. 



The third pleopod has the exopod operculiform and similar to those of the 

 preceding pleopoda, the endopod is branchial, much shorter than the exopod, 

 and somewhat quadrangular in shape, with rounded angles. The fourth 

 (fig. 41) and fifth pleopoda are similar in shape and structure to the third. 



In the female the first pleopod (fig. 42) has the outer ramus of the same 

 shape as in the male but considerably smaller ; it has the outer margin 

 strongly convex proximally and concave distally, but is not distinctly 

 bilobed as in Oniscus ; the inner ramus was not seen, it appears to be 

 either absent or very small. The second pleopod of the female (fig. 43) 

 has the outer ramus larger and of the same shape : arising from the basal 

 portion near the middle line is a small triangular appendage which appears 

 to represent the inner ramus ; it is firm and chitinous like the outer ramus 

 and is not branchial in function. 



The uropoda (fig. 44) have already been described; the upper surface 

 of the base is somewhat keeled in the centre, and has the lateral portion 

 expanded and slightly concave above ; the uropoda are practically the same 

 in both sexes. 



Deto bucculenta {Nicolet). (PI. 40. figs. 45-59.) 



Oniscus bucculentus, Nicolet {S), 1849, p. 267, pi, 3, fig. 9. 



„ Budde-Lund, 1885, p. 206. 



Oniscus tuberculatus, Nicolet ($ ), 1849, p. 268. 

 „ „ Budde-Lund, 1885, p. 206. 



Oniscus novce-zealandice, Filliol, 1885, p. 441, pi. 54, figs. 7-8. 

 ScypJiax (?) auckJandicE, Chilton, 1901, p. 126 (in part). 

 Deto novce-zealandice, Chilton, 1906, p. 273. 

 „ „ Budde-Lund, 1906, p. 87. 



„ Chilton, 1909, p. 667. 



„ „ Chilton, 1910, p. 288. 



WNN, JOURN, — ZOOLOGY, VOL. XXXII. 3() 



