686 A NEW ENDOPARASITIC COPEPOD, 



I fail to see much significance in the resemblance between the 

 mouth-organs of Ive and those of the young Lerncea, nor am I 

 able to see that the remaining appendages may be brought into line 

 with those of Lerncea. 



It appears to me preferal)le to class Ire and Ubius as members 

 of the Choiidrdcanthidcr . 



In Chondr acanthus, the body is unsegmented but lobed, and the 

 appendages are antennules, antennae, mandibles, maxillae, and two 

 pairs of legs. In Ive, the body is unsegmented but lobed, and the 

 appendages are antennules, antennae, mandibles, and two pairs of 

 legs. In Ubius, also, five pairs of appendages are present; and, in 

 view of the general similarity between Ive and Ubius, one is justi- 

 fied in applying Mayer's identification to the appendages in this 

 species also. So that the absence of maxillae is the only feature 

 whicli contra-indicates the classification suggested, when weighing 

 external features for and against. 



Mayer describes having found male Ive attached to the female, a 

 plienomenon constantly presented by Chondracanthus. 



The segmentation of Ubius presents a type rare among the Crus- 

 tacea, and is similar to that of Chondracanthus, differing com- 

 pletely from that in LeimcenCKorschelt and Heider, Pt.ii., p. 11 7). 



Tlie unpaired genital gland in Ive is opposed to the classifica- 

 tion here suggested, but holds equally strong as an objection to 

 classifying the genus with Lerncea. 



BIBLIOGRAPHY. 



(1 ) Brooks, W. K.—"Luci/er, a Study in Morphology." Phil. Trans. Roy. 



See, clxxii., 1882. 



(2) Hakcker, v.- " Die Keimbaum von Cyclops." Arch, fiir mikr. Anat., 



xlix., 1897. 



(3) KoRSOHnr.T & Heidkr. — Textbook of the Kmbryology of Invertebrates 



(M. F. Woodward Edit.), Ft. ii., 1899. 



(4) MacMunn, C.A.— Phil. Trans. Roy. Soc. , cxciii., 1900. 



(5) Maykr, p.— With. Zool. Stat. Neapel, i., 1879. 



(6) ScHiMKEWiTSCH, W. — "Stiidien liber parasitische Copepoden." Zeits. 



fiir wiss. Zool., Ixi., 1896. 



(7) ScoTT, A. — Memoir vii., Liverpool Marine B. Com., 1901. 



