C Y M T H I D E A. 749 



G. 1. NESiEA, Leach, Edw.* — Lamella caudalis externa recta. 

 G. 2. Campecopea, Leach. — Lamella caudalis externa arcuata. 



Subfam. 3. ANCININiE. — Pedes 4 antici ancorales. 



G. Ancinus, Edw. — Appendices caudales una lamella oblongi, saliente basique 

 brevissimo instructs. 



The genus Ancinus, we suspect may belong with the Anisopods, 

 from the fact, that the two anterior pairs of legs are alike and unlike 

 the following, this seeming to point to the serial arrangement of the 

 legs 2:2:3, instead of that of 3 : 4, as in true Isopods. But, having 

 seen no specimen of the genus, we leave it in this place, where it is 

 arranged by Edwards. If Anisopodan, the type of structure is still 

 like that of the Spheromidse. 



Family I. CYMOTHOID^. 



Subfamily CYMOTHOIN^. 

 Cymothoa excisa. Perthy. 



Corpus subovatum, crassum. Caput transversum, /route arcuatum, inter 

 segmenti thoracis lmi processus dimidio inclusum, processubus sub- 

 conicis, obtusis vel subacutis. Abdominis segmentum posticum plus 

 duplo latius quam longum, margine postico paulo excavato. Articulus 

 lmus pedis Ui versus basin tuber culo infra non armatus nee angulatus, 

 pedis lmi latissimus, parce longior quam latus. Styli caudales breves, 

 ramis svhmquis. 



Body subovate, stout. Head transverse, rounded anteriorly ; processes 

 of anterior segment of thorax either side of head projecting to half 

 the length of the head. Caudal segment very broad, much more 

 than twice as broad as long; posterior margin a little excavate. 

 First joint of fourth pair of legs without a prominence below near 



* Cilicsea of Leach is included. 

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