584 " THETIS " SCIENTIFIC RKSULTS. 



expanded, bulging below in front, behind produced downward 

 over the third joint, the fifth and sixth joints a little more robust. 

 The pleopods carry one or two coupling spines on the peduncle, and 

 the rami have about seven joints. The first uropods have the 

 peduncle much longer than the rami, which are slightly armed, 

 a little unequal. In the second uropods the peduncle equals the 

 longer inner ramus ; in the third the peduncle is longer than the 

 slight outer ramus, but a little shorter than the inner ramus,which 

 is intermediate in length between the two rami of the second pair. 



Telson simple, triangular, somewhat rounded above, reaching 

 more than half-way along the peduncle of the third uropods. A 

 process or stout spine projects from the under surface a little 

 above the middle. 



Length of one specimen, about 2*5 mm.; of the other, about 3 mm. 



The specific name innocens is given to this exceedingly 

 interesting little creature to guard it against any unworthy 

 implication in connexion with its generic name. The sharpened 

 points of several of its oral appendages, however, rather imply 

 that it penetrates the tissues of other animals to suck their juices 

 for its nutriment. 



Localities. — Off Port Hacking and Wata Mooli. 



Family ACANTHONOTOZOMATID^. 



Acanthonotozomatidce, Stebbing, Das Tierreich, xxi., 11)06, p.210. 



To this family must be added the genus Pariphimedia, 

 Chevreux®. The species for which the genus was instituted, P. 

 integricauda, from the Wandel, differs from the rest of the 

 family, except Ijjhimedia ambigua, Haswell, in having the telson 

 not emarginate, but apically entire, as the specific name declares. 

 The new genus differs from all the older genera except Odius in 

 kaving the palp of the first maxilla almost rudimentary and one- 

 jointed. From Odius it is distinguished by having the second 

 gnathopods slender and chelate instead of subchelate and rather 

 robust. I incline to think that the very large twelve-toothed 

 accessory plate atti'ibuted to the left mandible of P. integricauda, 

 is in reality the principal plate preparing for the next exuviation. 

 Its position, as figured, would otherwise be almost unaccountable. 



IPHIMEDIA, //. Rathlee. 



Iphimedia, H. Rathlee, N. Acta Acad. Leop., xx., i., 1843,^p. 85. 

 Iphimedia, Stebbing, Das Tierreich, xxi., 1906, p. 214. ^^jjsv "'"; 

 Iphimedia, A. 0. Walker, Ann. Mag. Nat. Hist., (7), xviii.,1906, 



p. 150 

 Iphimedia, Walker, ISTat. Antarct. Exp., iii., 1907, pp. 4, 27. 



8 Chevreux— Bull. Soc. Zool. Fr., xxxi., 1909, p. 39. 



