1142 
#501 (492). ENHYDRiNAE Gill, 1872a, Arrangement Fam. Mamm., Smiths, 
Misc. Coll. no. 230, 6, 65. — Sea Otters. Differ from lutrinae as follows: 
Hind feet very large and paddle-Kke, with digits subequal, but the 5th 
slightly longer than the 3rd or 4th. Tail short. Basicranial axis depressed 
at an angle upon basifacial axis; angular of mandible remote from condyle; 
teeth with rounded cusps, median lower incisor suppressed. See #502. 
Syn. LATAXiNAE Pocock, 1922, Proc. Zool. Soc, London, part 4, no. 55, 
January, 830. 
#503. Enhydra ^2 Fleming, 1822, Philos. Zool., v. 2, 187, "Sea Otter", probably 
tsd. (1904) Lutra marina Steller, from coasts of North Pacific; tsd. (1924) 
Mustela ^ lutris Linn. — Sea otters. On hind foot toe 5 longest, toe 1 shortest, 
front toes very short. Tail not over one-fourth body length. Dorsal bristle 
hair so sparse that wool hair is exposed. Head+body much over 100 centi- 
meters long. Coast of northern Pacific. 
#502 Enhydra [or Enhydris «, Latax °, Lutra \ Phoca i] {Latax «) lutris (Linn., 
1758a, 45 [Mustela i]) Gray, 1843, List Mamm. CoU. Brit. Mus., 72. North- 
ern Sea Otter. Coasts of Bering Sea *; America; Asia. 
#502 Enhydra [or Enhydris ^ Enydris Latax {Enhydra) marina ^ (Leem, 
1767, Beskr. Finmark. Lapper, 208 [Lutra i]; Link, 1795, Beytr. Nat., v. 1 
(2), 84 [Lutra i]; Exrl., 1777, Syst. Regn. Anim., 445 [Lutra i]) Gray, 1843, 
Ann. Mag. Nat. Hist., v. 11, Feb., 119. Sea otter, loutre de mer, edle 
Seeotter, Seeotter. So. #502 Enhydra lutris, fide Trouess., 1904c, 215, 
Ehiott, 1905, 435, and Thomas, 1911, 138. Syn. lutris, fide Baird, 1857, 189. 
#503 (491). Hind feet usually smaller, never larger than fore feet; no structural 
modification subservient to aquatic life; kidneys not lobulate. See #504. 
#504 (507). Cavity of bulla completely divided into 2 subequal chambers by 
oblique partition passing from stylomastoid foramen forward and inward to 
carotid foramen. See #505. 
#505. Helictidinae Gill, 1872a, 6, 64. — Bulla not communicating with periotic 
hollow, its roof close to auditory annulus; upper carnassial with large bicuspid 
talon; molar wider than long, smaller than carnassial; lower carnassial with 
moderate heel and large metaconid; rhinarium very deep below nostrils, 
lateral slit of nostrils long and complete; no philtrum or groove on upper lip; 
ear with well-developed bursa. Feet fossorial, naked below, but narrow, 
with webbing extending only to proximal end of digital pads, which are 
widely separable; all pads coarsely striate; 2 long metatarsal pads. No anal 
pouch. See #506. 
#506. Helictis Gray, 1831, Proc. Zool. Soc. London, pt. 1 (8), post June 28, 94, 
mt. (only definite species) moschata Gray (tsd. 1904). — Ferret-badgers, 
Spitzfrett. Size small. Body and head elongate; ears small, but distinct; 
nose prolonged and terminating in a naked, obliquely truncated snout, 
separated from upper lip by a narrow hairy space; nose naked above for 
about one-third the distance to eyes. Legs short; claws much compressed, 
fore claws about double the length of hind; soles naked; naked portion of 
hind foot terminates some distance in front of heel. Mammae 4. Teeth 38 
«2 Syns.: Enhydria " Zittel, 1893, Handb. Palaeozool., v. 4 (3), 652, Enhydra Fleming, 1822, renamed; 
Enhydris ^° Temminck, 1838-1839, Hoeven's Tijdschrift Natuur. Gesch. Physiol., v. 5, 285, 
quotes Enhydris marina [not Enhydris Merrem, 1820, reptile]; 
Enydris « Fischer, 1829, Syuop. Mamm., 228 (syn. "Enhydra Fleming?"), mt. steUeri; 
Enhydris Jordan, 1888, Man. Vert. Anun. North. U. S., 5th ed., 339; 
Latax ° Gloger, 1827, Nova Acta Leop., Halle, v. 13 (2), 511, mt. marina Erxl., from coasts of 
North Pacific » so. (tsd. 1901; 1905) lutris Linn.; 
Pusa t ° Oken, 1816, Lehrb. Naturg., Th. 3, Zool., Abth. 2, 985, tsd. (1904) 3rd sp. orientatis Oken 
so. marina so. lutris Linn, [not Pasa Scopoli, 1777, phocidae]. 
