\ 



y 



LITTORAL FAUNA OF THE PANAMA PROYINCE. 



237 



Pacific Coast. 



I 



) 



Hypocoiiclia pauamensis. 



Lcpidopa inyops. 

 Clibaiiarius 2)aiiameiisis. 



Pagui'istes degueti. 



Paguristes fecundiis. 

 Pylopagurus longiinaiius, 



affinis. 



hirtimaiius. 

 Spiropaguruy occidentalis 

 Petrolistlies occidentalis. 

 Sicyonia affiiiis. 



Lysiosquilla dcsaussurci. 

 Sq^uilla panaiiiensis. 

 " biformis. 



it 



a 



Atlantic Coast. 



Hypoconcha sabulosa. 



" arcuata. 



Lepidopa seutellata. 



Clibaiiarius yittatus. 

 Paguristes depressus. 



" sericeus. 



Paguristes lyuiaui. 



Pylopagurus uugulatus. 



a 



rosaceus. 



Spiropagiirus iris. 

 Petrolistlies sexspinosus. 

 Sicyonia edwardsii. 

 Lysiosquilla scabricauda. 



Squilla intermedia. 



^ % 



4^ 



But few cliaracteristically Indo-Pacilic genera are found in the Panamian 

 Province. An ^iJira from the western coast of Mexico has been described 



^ 



JE^ 



americaua Stimps., a species closely related to the Indo-Pacilic JD. perlata 

 (Herbst), inhabits the western coast of Central America and Mexico. Four 

 species of Trapezia and one species of Quadrella have also been found on the 

 same coast.* Of the two known species of CJiorilibinia, one comes from North- 

 ern Australia and New Guinea, the other from the Gulf of California. One 

 species of Caqyllodcs ((7. cinctimanus) , a genus rather characteristic of the 

 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 agn/mst the richer fauna of the East; have allowed a 



I 



marked differentiation to come about between these two provinces of tlie 

 great Tropical Realm. On the other hand, tlie small number of genera 

 peculiar to the Panama fauna, and the large number, not only of West In- 



* Trapezia rvfopunctata (Hevbst), an Indo-Pacific species, recorded from the island of Socorro; 

 -T.ci/modoce (Ilorbst), also an Indo-racific species, from Panama and Acapulco; T. formosa Smith, from 

 Panama; T. nigrofusca Stimps., from Cape St. Lncas; quadrella nitida Smith, from Panama. Tm^) species 

 of the eastern genns Mi^ra, from tlie Gulf of California, have been recently described by Miss M. J. Katlibnn 

 (Proc. U. S. Nat. Mus., XYI. 255, 350, 1893). But tliis genus is liardly sepnrable from tlie American 

 genus Persephona. 



f Remlpes lesludinarlus, alliiough it belongs io ti ge mis of circumterranean distribuliou, belongs in the 

 category of speries whicli have readied the west sbore of tropical America from tlie Tndo-Pacific region. 



