ERRATA. 



Page 167. For Diplcethra read Diplarthra. 



Page IfiB. In table of genera, correct definition of genus Polymastodon to read: Fourth Inferior pre- 

 molar conical, simple ; inferior molars with two, superior molars with three, rows of tubercles. Strike 

 •out genus Catopsalis and its definition, as they refer to the inferior dentition of Polymastodon. 



Page 169. In phylogenetic table of Plagiaulacidse erase Catopsalis, and place Polymastodon on a side 

 branch out of the line between Thylacoleo and Ctenacodon; one which is derived from such mesozoic 

 forms as Tritylodon and Stereognathus of Owen. 



Page 240. The genus Necroleinur is erroneously included iu the Anaptomorphidse and should be 

 placed in the family Mixodectidte. The arrangement of the genera of these families is then as follows 

 ^see American Naturalist, 1884, p. 60) : 



I. Canine teeth large and latesal ; well separated. 

 First superior premolar without internal lobe ; superior true molars tritubercular with cingula. . Tricenie*. 

 II. Canine teeth median in position or much reduced in size. 

 a. Last inferior premolar without internal tubercle. 



nferior premolars all one-rooted. Canine and incisor small Neerolemur. 



First premolar only one-rooted; canine small; incisor very large Mixodeetes. 



aci. Last inferior premolar with internal tubercle. 



A very large ? canine; first premolar only one-rooted Microsyops. 



A very large f canine; first and second premolars both one-rooted Cynodontomya. 



The new genus Tricentes includes three species, and perhaps four. It will be described in the last 

 part of Volume IV of this series with the genus Indrodon of the next family. 

 The genera of Auaptomorphidae diifer as follows : 

 a. Incisors three. 

 First superior premolar without inner lobe; posterior inner tubercle present on first and second snperioi 



true molars Indrodon. 



aa. Incisors two. 

 First superior premolar with inner lobe ; no posterior inner tubercle on superior molars. ..inoptomorpAu*. 



Page 260. Line 7, the genus Diacodon should probably be removed to the section of the family where 

 the fourth premolar is different in character from the first true molar. 



Page 391. In synonymy of Periptvchus rhabdodon, for Catathtcerhus read Calalhlceua. 



Page 739. Omit from the definition of the Prosimiie, in the table at the bottom of the page, the words 

 " superior true molars quadritubercalar." 



Page 920. Eighth line from bottom, for "fishes" read fisher. 



Explanation of Plate XXIX d (p. 42), at bottom, correct fig. 2 by stating that the anterior two teeth 

 figured belong really to the lower jaw, which is very robust, and that the second upper premolar has 

 an internal lobe. Add that the Periptychua dilrigonut does not belong to Conoryctes, but to a genus of 

 PeriptychidsB, which differs from all those known by the presence of a conic cusp external to the usual 

 external tubercles of the superior molars. It may be called Ectoconns m. To an allied genos must be 

 referred the second specimen figured and described as Conoryctea comma m. 



