1902] GENERIC NOMENCLATURE 227 
their generic names with binomial species. Thus, in the case of 
Haller,® this plan would lead to the application of his generic 
tames to different groups from those to which they would be 
applied by taking his first species as a type. It may be the 
intention, however, to disregard the genera of polynomialists 
entirely, as well as all those based upon descriptions not accom- 
panied by direct citation of binomial species. 
Dr. Underwood, /. c., has formulated a series of rules and made 
4 practical application of them. He adopts 1753 as his starting 
point, and designates what are to be regarded as valid genera as 
follows : “(a) based on one or more previously described species 
_ Which are referred to with sufficient directness to be recognizable, 
» > (6) based on some species which is described for the first 
- "me at the establishment of the genus itself.” 
. For the selection of types the following rule is given: . “ For 
- —- established, the first named _ species will be regarded 
«type. Two exceptions to this are made. One is that 
ee i Senera must be traced to their types wherever they — 
slated, and “in case the original generic name was used in 
he Z ewe than that which it was adopted by Linneus, the 
ne type ea the genus in the Linnean sense must be determined 
: ia a first used.” The other exception covers cases 
of the genus, oe 
senclie application of these rules leads to entirely different bee 
Which Dr, 
ate them accordingly? There also seems to be need ~ 
? ~~ Provisions for determining the types of such — 
ao a Adanson,” which are accepted by Underwood — 
oo to be interpreted according to any rigid rule. 
US | ee 
a definite statement of the type” is made by the author a Me 
ct tcee which would be reached by following Mr. a 
: Plan. The difference is due in great part to the manner 
— Underwood determines the types of Linnzan — 
ae oe 1753 as a starting point, and then selecting = 
: = ty from Linnzus’s earlier work, appears rather 
| types are to be taken from works earlier than 1753, 
