Dr. Leach’s Arrangement of the Crustacea^ ^c. 395 
that those organs called palpi were used by the animal in grasp- 
ing and changing the position of its food whilst applied to the 
action of the inandibules, serving in fact the purposes of hands. 
Hence it occurred to Sir Joseph Banks that these parts were im- 
properly named, and that they were really similar in function to 
the claws of scorpions ; which opinion is firmly supported by 
analoo'y, as shall on some future occasion be shown, Avhen the 
subject has undergone further examination. 
Clerk calls the palpi, brachia, and asserts that they contain the 
organs of generation ; an opinion entertained also by Linne, who 
says '^‘■Venes in palpis geriint f but, as Sir J. Banks observes, this 
opinion is no where supported by a statement of facts, or of ana- 
tomical examination. That the palpi of all male spiders are cla- 
vate at their extremities, every naturalist well knows ; but if they 
really contain the sexual organs of the male, it is a circumstance 
of a most curious nature, and well worth the attentive examination 
of the physiologist ; and we shall feel much obliged to any natu- 
ralist who can give any information as to the truth or falsity ot 
this anomalous statement. 
Ordo IV. Monomerosomata, 
SECT 10 I. 
Pedes ambulatorii. 
Fain. I. TaoMBimDES. 
Os mandibulis instructum. Palpi porrecti ad apicem appendice 
mobili instruct!. 
Stirps 1. 
Oculi duo in pedunculum inserti. Corpus lined transversd quasi 
hipartitum, parte anticd os, oculos, pedesque quatuor anticos 
gerente. 
VOL. XI. 
Gen. 1. 
