66 INDEX GENERUM MAMMALIUM. 
isfactory in many cases, but the difficulty in working them out may be 
illustrated by a few examples. The genus of monkeys called Dana 
is apparently so named from the white marking or line over the fore- 
head of the type species, which bears a fancied resemblance to the silver 
bow of the goddess Diana.  /demzneus,; the name of a king of Crete, 
does not seem applicable to a genus of gerbilles, unless it is remembered 
that Idomineus and Meriones were companions in arms in the Trojan 
war, and JMerones having long been used for a genus of Gerbilline, it 
was thought fitting that a subgenus of the same group should be 
named after his companion, /domzneus. Adjidaumo, as applied to an 
extinct genus of rodents from the western United States, requires for 
many the describer's explanation that the designation was the Indian 
name of a squirrel borrowed from Longfellow’s poem * Hiawatha.’ 
(10) Mames founded on error. —Names founded on error or without 
application are comparatively few in number, but are still sufficiently 
numerous to warrant mention. Errors as to the relationships of ani- 
mals are to be expected in the case of extinct forms described from 
fragmentary remains, and it is not surprising that additional specimens 
have sometimes shown that an animal belongs to a different family or 
order from the one to which it was originally referred. Such errors 
can be corrected when discovered, but the names 1n which they are 
sometimes embodied must stand as first published. Several generic 
names thus erroneously given are strikingly inapplicable. Thus 
Aeeratherzuim was so named because it was supposed to be a hornless 
rhinoceros, but according to Osborn the animal probably did possess 
arudimentary horn. — 4AZLuravus, originally supposed to be an ancestral 
carniofé; is now regarded as a squirrel. Aodon (the toothless whale 
of Pigvite) really belongs to the toothed whales, but was described from 
an old specimen of JMesoplodon bidens which had evidently lost its 
teeth. The well-known genus of zeuglodon, originally described as 
Dasilosaurus (king of the saurians) from its supposed reptilian charac- 
ters, is now known to be a cetacean and nota reptile. | Condwylura 
(knotted tail) was applied to the star-nosed moles by Illiger, who 
based his description on a very imperfeet figure, in which the tail was 
represented as having a series of nodes. — Z7yperoodon and Uranodon 
(palate tooth) were applied to the same genus of ziphioid whales on 
account of the rough papille on the palate, which were at first mis- 
taken for teeth. Parudoxvurus (strange tail) owes its name to the 
circumstance that the tail, which the animal has power to coil to some 
extent, was originally supposed to be prehensile, a character which 
would certainly be anomalous in the civet cats. Protorhea, based on 
an imperfect femur, was at first supposed to be an extinct struthious 
bird, but was afterwards regarded as a mammal related to the llamas. 
Stemmatopus (wreathed foot) was given to the hooded seal by Cuvier, 
though it 15 probable that the name intended was Stemiatops (wreathed 
face), in allusion to the hood, and that the insertion of a & by mistake 
