508 BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



TYCHE LAMELLIFRONS Bell 



Plate 273, figs. 1-6 



Tyche lamelUfrons Bell, Proc. Zool. Soc. London, vol. 3, 1835 (1836), p. 



173 (type-locality, Panama; type in Brit. Mus.); Trans. Zool. Soc. London, 



vol. 2, 1836, p. 58, pi. 12, figs. 3, 3/-;.— Stimpson, Ann. Lye. Nat. Hist. 



New York, vol. 10, 1871, p. 97. — A. Milne Edwards, Crust. Reg. Mex., 



1878, p. 126. 

 Tyche brevipostris [for brevirostris] Lockington, Proc. California Acad. Sci., 



vol. 7, 1876 (1877), p. 74 [12] (type-locality, Port Escondido, Gulf of 



California; type not extant). 



Diagnosis. — Preorbital horns subparallel. Posterior margin of 

 carapace entire or faintly trilobate. Posterior half of carapace, 

 measured from median gastric tubercle, as wide as long. 



Description. — General aspect that of a dried leaf (Lockington). 

 Carapace very wide in front; gastric region swollen, cardiac and 

 branchial regions depressed. Lateral borders straight and nearly 

 parallel at hepatic regions, rounded at branchial regions. Posterior 

 border lamellate. Front with two small, flat horns curved toward 

 each other, extremities bispinose. The superior orbital border 

 extends in the form of a plate over the eye and projects nearly for- 

 ward in a strong horn. A deep fissure separates orbit from hepatic 

 margin. 



Chelipeds of male slender, smooth, shorter than the next pair of 

 legs; fingers touching only at their extremity. Ambulatory legs very 

 slender and cylindrical. 



Color. — A dull, uniform brown, paler beneath (Bell). 



Measurements. — Male, cotype (Bell), length of carapace including 

 rostrum 7 lines (17.8 mm.), width 4 lines (10.2 mm.). Ovigerous 

 female (Paris Mus.), length 23.1, width 14.2 mm. 



Range. — From Gulf of California to Panama; on sandy bottom 

 (Bell). To a depth of 10 fathoms. 



Material examined. — 



Gulf of California; lat. 24° 22' 15" N.; long. 110° 19' 15" W.; 7 

 fathoms; brk. Co.; April 30, 1888; station 2825, Albatross; 1 male 

 (21905). 



Lower California; Diguet, collector; 1 ovigerous female (Paris 

 Mus.). 



TYCHE EMARGINATA White 



Plate 272; plate 273, figs. 7-12 



Tyche emarginata White, Ann. Mag. Nat. Hist., vol. 20, 1847, p. 206 (type- 

 locality, West Indies; type in Brit. Mus.). — Stimpson, Bull. Mus. Comp. 

 Zool., vol. 2, 1871, p. 119. — A. Milne Edwards, Crust. R4g. Mex, 

 1873, pi. 13, figs. 1-le; 1878, p. 126.— Aurivillius, K. Svenska Vetensk.- 

 Akad. Handl., vol. 23, No. 4, 1889, p. 43, pi. 3, fig. 4. 



Platyrinchus trituherculatus Desbonne, in Desbonne and Schramm, Crust. 

 Guadeloupe, 1867, p. 3, pi. 3, figs. 7 and 8 (type-locality, Guadeloupe at 

 Moule, Northwest Bay; type probably not extant). 



