TRETOSPHYS—TRIBODON. 687 
Tretosphys—Continued. 
Species, 5, from the Miocene of Maryland and New Jersey: Delphinapterus lacer- 
tosus Cope, and Priscodelphinus grandxvus Leidy, from Shiloh, Cumberland 
County, New Jersey; D. gabbii Cope, from 
Shiloh, New Jersey; and D. ruschenbergeri Cope, from Charles Co., Maryland. 
Extinct. 
Tretosphys: tentos, perforated; d6@uvs, the loin—in allusion to the caudal verte- 
bree, which are perforated at the base by a vertical foramen. 

; Tretosphys ureus Cope, from 
Tretulias Corr, 1895. Cete, Baleenidee. 
Proc. Am. Philos. Soc, XXXIV, No. 147, pp. 143-145, pl. vi fig. 2, May 29, 
1895. 
Type: Tretulias buccatus Cope, from the Yorktown (Middle) Neocene beds of 
Maryland, Virginia, and North Carolina. 
Extinct. *'Represented by parts of the mandibular rami of two individuals." 
Tretulias: rp5rós, perforated; -- Ulias—in allusion to the presence of gingival 
canals and foramina which are absent in U/ias. 
Triacanthodon Owen, 1871. Marsupialia, Triconodontide. 
Mon. Paleeontograph. Soc., X XIV, [No. 5], 72-74, pl. tv figs. 7-8, 1871. 
Type: Triacanthodon serrula Owen, from the Purbeck of Durdlestone Bay, Swan- 
age, Dorsetshire, England. 
Extinct. Based on a portion of a left mandibular ramus, together with an 
impression and its counterpart of the same specimen. 
Triacanthodon: rpi-, three; &x«v6a, spine; 00v = ó80vc, tooth. 
Triacodon Marsn, 1871. Creodonta, Proviverrid:e? 
Am. Journ. Sci. & Arts, 3d ser., II, 123, Aug., 1871 (sep. issued June 21). 
Type: Triacodon fallax Marsh, from the Eocene of Grizzly Buttes, near the base 
of the Uinta Mountains, Wyoming. 
Extinct. Represented by ‘a premolar tooth, and possibly by some additional 
remains.’ 
Triacodon: rpi-, three; ak, point; 6d5@v=dédovs, tooth—in allusion to the 
premolar. 
Trizenops Dorssow, 1871. Chiroptera, Rhinolophid:e. 
Journ. Asiatic Soc. Bengal, Calcutta, XL, pt. 2, pp. 455-459, pl. xxvii, 1871. 
Type: Triznops persicus Dobson, from the vicinity of Shiraz, Persia (alt. about 
4,750 ft. ). 
Trixnops: rpioiva, trident; cw, face—in allusion to the posterior part of the 
nose-leaf, which terminates above in three pointed projections resembling the 
prongs of a trident. 
Triaulacodus LvpEkkEn, 1896. Glires, Octodontide. 
Geog. Hist. Mamm., 91, 240 footnote, 1896. 
New name for Aulacodus Temminck, 1827, which is preoceupied by Aulacodus 
Eschscholtz, 1822, a genus of Coleoptera. Antedated by Thryonomys Fitzinger, 

1867. 
Triaulacodus: rpi-, three; -|-Aulacodus—in allusion to the three grooves in the 
upper incisors. 
Tribodon AMEGHINO, 1887. Glires, Octodontide. 
Apuntes Prelim. sobre Mamif. Estinguidos de Monte Hermoso, 7-8, Apr., 1887; 
Cont. Conocimiento Mamíf. Fós. Repüb. Argentina, in Act. Acad. Nac. Cien. 
Córdoba, VI, 142, 1889. 
Trilodon Ftower & LypDEKKER, Mamm., Living and Extinct, 484, 1891 (misprint). 
Type: Tribodon clemens Ameghino, from Monte Hermoso, about 40 miles east of 
Bahia Blanca, Province of Buenos Aires, Argentina. 
Extinct. Based on the right lower jaw with the incisor and four molars. 
Tribodon: tTpifw, to rub, to wear; óóc v —óó07vzs, tooth. 
