APPENDIX. No. IV. 417 



encrease in length : at the base of the second joint, each is furnished with a 

 bipartite flagriim, the second division of which is articulated and ciliated : 

 tlie third pair is terminated by a simple ciliated joint ; the three next pair 

 by claws, which in some of the species are ciliated with spines, and meet 

 little spines on the Interior side of the apex of the joints to which they are 

 attached : the last pair is abruptly shorter than the preceding legs, and 

 varies in the number of its joints, from two to five. The organs, termed ears 

 hy the French naturalists, are very large and prominent. I have not 

 examined the nervous system. 



1. Phyllosoma brevicome. Inferior antenna^ shorter than the superior ones, 

 with the second division slightly dilated externally ; the two last divisions 

 setaceous ; hinder pair of legs two-jointed ; the second joint simple. 



2. Phyllosoma laticorne. Inferior antennae a little longer than the superior ones, 

 the second joint very mucli dilated externally, and produced at its external 

 apex, the last division lanceolate, hinder pair of legs five-jointed, the last 

 joint with a simple slightly curved claw. 



Two specimens only were taken, and their locality was not set do\vn. 



.S. Phyllosoma commune. Inferior antennas filiform rather more than twice the 



length of the superior ones, hinder pair of legs four-jointed ; the last joint 



terminated by a straight simple claw. 



Taken at Porto Praya and during the voyage until 2, 58, S. lat. 



P, 21, 22 E. long, in the greatest profusion. 



4. Phyllosoma davicorne. Inferior antennas filiform, half as long again as the 



thorax, with the extremity of the last division clavate, hinder pair of legs 



foui--jointed ; the last joint terminated by a simple and very slightly curved 



claw. Occasionally taken with the preceding species. 



From the above very general obser\ations, it will be very evident to 



entomologists, that Phyllosoma constitutes a family of crustacea ma- 



croura, to which no other discovered genus can lie referred. 



Amongst the sessile-eyed crustacea, with compressed bodies, there are four 



new species which constitute the types of as many genera, and of those 



with depressed bodies, there are ; of 



6ph.«koma, a new species. 



Cymothoa, a new species. 



And a new species of an unnamed genus, intermediate betwixt the genera 



JEga and Eurydke. 



3 H 



