—y . ; me, tA ro Phe CS” pase * Oe 
~s = row 
~ 
224 CORYSTOID CRABS—BENEDICT. — i 
Michaels Island, Alaska, and perhaps much farther north; westward 
along the Aleutian Islands, the Commander Islands, and formerly and 
probably yet along the coast of Siberia. 
Telmessus cheiragonus (‘Tilesius). 
Plates xxv and xxv1; figs. 2, 3, and 4. 
“Cancer adsperso setosus vel Hippocarcinoides Stelleri Mserpt. No. Ut. Alio loco 
Stellero Cancer pilosus et Cancer auritus dictus (1741. Awatsche)” teste Tilerius, 
Cancer cheiragonus Tilesius, Mém. de Acad. de St. Pétersbourg, Vol. v, p. 347, 1815. 
(Tab. vu, Fig. 1, is referred to in the text. There are no plates in the Smithso- 
nian copy of the work.) 
Telmessus serratus White, Ann. & Mag. of Nat. Hist., Vol. xvi, p. 497, 1846; also 
Voyage of Samarang, Crustacea, p. 14, 1848. 
Platycorystes ambiguus Brandt, Bulletin Physico-Mathématique de PAcadémie de 
St. Pétersbourg, Vol. vir, p. 179, 1848. 
Platycorystes cheiragonus Brandt, Middendorff’s Sibirische Reise, Band 11, Theil 1, p. 
85, 1851. 
Cheiragonus hippocarcinoides Brandt, Middendorft’s Sibirische Reise, Band 11, Theil 
1, p. 147, 1851. 
Telmessus serratus Dana, U. 8. Exploring Expedition, Crustacea, Vol. 1, p. 303, Pl. 
18, Fig. 8, 1852. 
Cheiragonus hippocarcinoides Stimpson, Crustacea and Echinodermata of the Pacific 
Shores of North America, Boston Journal of Nat. Hist., Vol. v1, p. 465, 1857. 
Telmessus serratus and T, cheiragonus Miers, Proc. Zodl. Soc. of London for 1879, p. 36. 
Telmessus serratus §. I. Smith, Geological Survey of Canada, Report for 1878 and 1879, 
p. 208 B, 1880. 
Teeth or denticles of the median lobe of the front often wanting in 
old worn specimens; lateral lobes triangular, forming the inner angles 
of the eyes. Carapace deeply areolated. Lateral teeth six in number 
including the angles of the eyes the anterior three with two denticles 
on the anterior margin of each. The points of the teeth are bent for- 
ward and are ona line with the denticles. The fourth tooth forms the 
lateral angle of the carapace, and has four denticles on the anterior 
margin, one close to the point of the tooth; then a space, followed by 
three denticles evenly placed. The posterior teeth are without denti- 
cles. The surface of the carapace is set with large granules, in the 
posterior region forming lines. From these granules arise numerous 
bristles of even length, which bend forward and are enlarged at the 
points. (See Fig. 4.) 
The merus of the chelipeds has three nearly equal surfaces. The 
inner margin of the carpus is produced into a large, triangular, sharp- 
pointed tooth; a deep groove runs along its outer distal margin; the 
outer surface is spiny. The outer surface of the palin is traversed by 
four rows of tubercles; on the upper surface there are two or three 
spines on the inner margin, and a row of tubercles on the outer 
margin. The fingers are deeply grooved; the prehensile edges are 
heavily armed with tubercular teeth. On the ambulatory legs are 
lines of granules bearing coarse bristles. All of the joints are much 
compressed. The dactyls have short horny tips; on eachside is a wide 
groove, and also a narrow one. The upper margin is grooved; on each 
