414 APPENDIX. No. IV. 
peduncles to its eyes, which are inserted into the same part of the shell as 
im that genus. 
Pilumnus, (a new species.) Gulph of Guinea. 
Grapsus minutus, and a new species. Gulph of Guinea. 
Dorippe. Species not determined. 
Sp. 1. Megalopa* Cranchii (new species) with a broad, entire, porrected 
rostrum, haying its point terminating in one spine, and each side armed 
with a tooth, hinder coxz armed with a straight spe. Gulph of Guinea. 
This species belongs to the same division of the genus with those of our seas. 
Sp. 2. Megalopa maculata. (new species) Shell smooth, and spotted with black, 
rostrum narrow and abrubtly deflexed. 
Sp. 8. Megalopa sculpta. (new species) Shell sculptured (like that of Cancer 
floridus Herbst) and very hairy, rostrum narrow and abruptly deflexed. 
Ozs. These two species were likewise taken in the Gulph of Guinea; 
they form a new division of the genus characterised by the deflexed 
rostra. 
Scyllarus. Of this genus, a common species was taken during the voyage, and 
having been preserved in spirits, allowed me to ascertain by dissection, that 
its nervous system is in all respects similar to that of the other macrourous 
crustacea. Its lamelliform broad antennze send their nerves to the same 
ganglion. The optic nerves are more curved in their course, 
Of the large group of macrura comprehending the shrimps and prawns there 
are eleven new species, and seven new genera. 
A new genus allied to Nebalia. 
Zoéa. The type of this genus was discovered in the Atlantic by Bosc, who 
believed it to hold an intermediate situation between the crustacea with pedun- 
culated, and those with sessile eyes. By Latreille it was referred to the 
Entomastraca. InN. lat. 1, 36, 0 E. long. 8, 46, 37, Mr. Cranch took a 
new species of this interesting genus, by which I have been enabled to verify 
the opinion published in the Supplement to the Encyclopaedia Britannica, 
(vol. i. p. 423) where I have referred it to the crustacea with pedunculated 
eyes. 
* The last sezment of the abdomen on each side is furnished with two moveable 
plates, which I formerly overlooked. 
