LITTORAL FAUNA OF THE PANAMA PROVINCE. 
Paciric Coast. 
Hypoconcha panamensis. 
Lepidopa myops. 
Clibanarius panamensis. 
Paguristes degueti. 
Paguristes fecundus. 
Pylopagurus longimanus. 
A: affinis. 
bs hirtimanus. 
Spiropagurus occidentalis, 
Petrolisthes occidentalis. 
Sicyonia affinis. 
Lysiosquilla desaussurei. 
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ATLANTIC Coast. 
Hypoconcha sabulosa. 
ss arcuata. 
Lepidopa scutellata. 
Clibanarius vittatus. 
Paguristes depressus. 
se sericeus. 
Paguristes lymani. 
Pylopagurus ungulatus. 
OS rosaceus. 
Spiropagurus iris. 
Petrolisthes sexspinosus. 
Sicyonia edwardsii. 
Lysiosquilla scabricauda. 
Squilla intermedia. 
Squilla panamensis. 
“  biformis. 
But few characteristically Indo-Pacific genera are found in the Panamian 
Province. An dthra from the western coast of Mexico has been described 
by S. I. Smith as a new species by the name of 4. scutata, but A. Milne 
Edwards regards it as a mere variety of the Indo-Pacific 4. scruposa. Daira 
americana Stimps., a species closely related to the Indo-Pacific D. perlata 
(Herbst), inhabits the western coast of Central America and Mexico. Four 
species of Zrapezia and one species of Quadrella have also been found on the 
same coast.* Of the two known species of Chorilibinia, one comes from North- 
One 
species of Carpilodes (C. cinctimanus), a genus rather characteristic of the 
ern Australia and New Guinea, the other from the Gulf of California. 
Indo-Pacific region, is recorded from Cape St. Lucas.f Still, the number of 
peculiarly Indo-Pacific genera is so small as barely to give a perceptible tinge 
to the Panamian fauna. The great sea-distances separating the tropical Indo- 
Pacific Province from the Panamian, together with the adverse equatorial 
current which sets against the richer fauna of the East, have allowed a 
marked differentiation to come about between these two provinces of the 
great Tropical Realm. On the other hand, the small number of genera 
peculiar to the Panama fauna, and the large number, not only of West In- 
* Trapezia rufopunctata (Herbst), an Indo-Pacific species, recorded from the island of Socorro; 
T. cymodoce (Herbst), also an Indo-Pacific species, from Panama and Acapuleo; 7. formosa Smith, from 
Panama; 7. nigrofusca Stimps., from Cape St. Lucas; Quadrella nitida Smith, from Panama. Two species 
of the eastern genus Myra, from the Gulf of California, have been recently described by Miss M. J. Rathbun 
(Proc. U. S. Nat. Mus., XVI. 255, 256, 1893). But this genus is hardly separable from the American 
genus Persephona. 
+ Remipes testudinarius, although it belongs to a genus of cireumterranean distribution, belongs in the 
category of species which have reached the west shore of tropical America from the Indo-Pacific region. 
