338 ME. A. T. JENNINGS ON THE ISOPOD GENUS OUBOZEUKTES. 



justified in regarding Ourozeuhtes as a descendant of some form 

 similar to Anilocra, which has by semi-parasitism become modified, 

 though one can hardly say distinctly degenerate. 



EXPLANATION OF THE PLATES. 



Plate XIII. 

 Fig. 1. Ourozeuhtes Owenii, M.-Edw. Doj-sal aspect. 



Ventral aspect. 

 Lateral aspect. 

 From the front. 

 Lavja. Dorsal aspect. 



„ Lateral aspect. 



,, Ventral aspect. 



Plate XIV. 



Ourozeuhtes Owenii, Milne-Edwards. 



[In regard to the details shown on this Plate, it is important to state that 

 the observations were made on a single specimen without removing any of the 

 parts — hence the difficulty of giving an absolutely true repi-esentation ; but 

 the drawings are the result of repeated examination, and there is no reason to 

 doubt their substantial accuracy.] 



Fig. I. The head and mouth-appendages, seen from below ; the latter partly 



covered by the first pair of oostegites. 

 Fig. 2. The same, with the first oostegites reflected, showing the maxillipedes. 

 Fig. 3. The same, with the maxillipedes supposed removed and the second 



maxillae reflected back. The styliform first maxillaj are then seen 



directed forward to the labium, flanked by the mandibles and their 



palpi. 

 Figs. 5, 6, 7, 8. The mandibles, first and second maxillaj, and maxillipedes of 



the left side. 

 Fig. 9. The abdominal area, seen from the ventral side, with the fifth oostegites 



reflected and the right first abdominal appendage moved outward. 

 Fig. 10. Second abdominal (respiratory) appendage, seen from the dorsal and 



ventral aspects. 

 Fig. 11. Semidiagrammatic side view of the animal, to show the relations of the 



oostegites to each other and to the limb-sockets. 



M. Mouth. 

 Lhr. Labrum. 

 Lh. Bilobed labium. 

 Md. Mandibles. 

 Mx^. First maxillse. 

 Mx^. Second maxillse. 

 Mx'p. Maxillipedes. 



Reference letters. 



0, to 0. 



The five pairs of oostegites 



forming the brood-chamber. 



Ay. First abdominal appendage. 



A^. Last abdominal appendage. 



A,, to A-. Abdominal i-espiratory 



appendages. 



7\ to T^. Sockets of the thoracic 



appendages. 



