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 

 witli those of Lerncea. 



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

 of the Chondnicanthidtr. 



In Chondracanthus, tlie body is unsegmented but lobed, and the 

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

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

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

 legs. In Vbius, 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 tlie absence of maxillae is the only feature 

 which eontra-indicates the classification suggested, when weigliing 

 external features for and against. 



Mayer describes liaving found male Ive attached to tlie female, a 

 phenomenon constantly presented by Clwndr acanthus. 



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

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

 pletely from that in Le7-na'.a{^ovsche\t and Heider, Pt.ii., p.ll7). 



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

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

 classifying the genus with Lernfca. 



BIBLIOGRAPHY. 



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



See, clxxii., 1882. 

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



xlix., 1897. 

 (.S) KoRSCHELT & Heider. — Textbook of the Embryology of Invertebrates 



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

 (1) MacMdnn, C.A. — Phil. Trans. Roy. Soc , cxciii., 1900. 



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



(6) SOHIMKEWITSCH, W. — " Studien iiber parasitische Copepoden." Zeits. 



fur wiss. Zool., Ixi., 1896. 



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



