Fig. 28 . Larval forms of Odontodactylus. a. Lateral aspect of odonterichthus larva, first abdominal appendage, 
and dorsal aspect of last abdominal somite, telson, and uropods; h, lateral aspect of odonterichthus larva and 
dorsal aspect of last abdominal somite, telson, and uropods; c, first, third, fourth, and fifth thoracic appendages 
of same; d, second thoracic appendage of same; e, first abdominal appendage of same. 
by comparing the raptorial claws. In pseu- 
derichthus larvae this appendage is finely 
pectinate along the upper margin of the pro- 
podus, and the dactylus is not inflated at the 
base. In odonterichthus, however, the rapto- 
rial propodus is not pectinate along its upper 
margin, and the dactylus is inflated at its 
base. In later stages the ischio-meral articula- 
tion of the raptorial appendage would be a 
useful diagnostic character, but none of the 
specimens has attained this condition, which 
is present in the adult. This genus is un- 
doubtedly closely related to Gonodactylus, but 
it has been impossible to compare the larvae 
of the two genera because no specimens of 
the latter have been collected in Hawaiian 
waters. Claus (1872) and Brooks (1886) have 
both illustrated gonerichthus larvae which 
were collected from other regions, and com- 
parisons with their figures show that the Mo- 
lokai Channel specimens definitely belong to 
the odonterichthus type. Foxon (1932) uses 
the character of the long spines found on the 
telson of Odontodactylus larvae for separating 
them from Gonodacytlus, although he does not 
present any figures to illustrate his statements. 
Since no Gonodactylus larvae have been col- 
lected in the Hawaiian waters, I cannot say 
whether or not this is a valid character for the 
separation of the larvae of the two genera, but 
comparisons with Claus’s and Brooks’s figures 
of gonerichthus larvae show that the spines 
on the telson of their specimens are consider- 
ably shorter than those found in the present 
specimens. With this in mind I have placed 
the character in the key with the hope that 
some future worker who may find the go- 
nerichthus larvae will be saved some effort in 
