no.1766. STALK-EYED CRUSTACEA OF PERU RA 77//.T.V. , r ). l> )3 



Recent additions to tin fauna. The Crustacea obtained l>\ Doctor 

 Cokerwere collected at various points on the coast bet ween latitudes 

 3° 30' and 17° S.; on the beaches and salt marshes, in shallow water 

 along shore, in fish nets, and with the dredge and trawl in a \\>\v 

 fathoms at three or four stations ; also in the rivers and at the markets. 

 More extensive dredging in shoal waters would no doubt result in a 

 much greater number of forms. The new stalk-eyed species and sub- 

 species number 7; of the known species, (here are 27 additions to the 

 Peruvian fauna, making in all 122 species. 



The most notable additions are a Dromidia, the first typical 

 dromiid reported on the west coast of South America; and specimens 

 of Panopeus bermudensis hitherto known only from the Atlantic. 

 Eupleurodon trifurcatus and Hepatella arnica have never before been 

 noted since their first description. One is impressed by the super- 

 abundance of Xanthidse and Inachidse and the scarcity of Partheno- 

 pidse and of shrimps of all kinds. 



The number of interrogation points in the list of synonyms gives an 

 indication of the amount of work still to be done before the fauna of 

 the west coast of South America is thoroughly known. Fortunately, 

 the governments of both Peru and Chile have become aware of the 

 importan.ee of a knowledge of the marine fauna, and it is hoped that 

 the work so well begun will be continued with the same vigor. 



The Peruvian Province. — The Crustacea of Peru form part of a 

 fauna corresponding to the molluscan "Peruvian Province," defined 

 by Dall " as extending from Guayaquil, Ecuador, to the island of 

 Chiloe, in southern Chile. While the southern limit of the fauna is 

 rather well defined, the transition at the north into the Panamic 

 Province is much more gradual. For this reason there have; been 

 included in my list of species likely to occur in Peru all those recorded 

 from Panama southward to Chiloe, down to a depth of 10 fathoms; 

 also all fresh-water decapods on the Pacific slope south of Panama. 



Some of the species listed from southern Chile, as Liihodes antarctica 

 and perhaps Paromola raihbuni and Palinustus frontalis, belong prop- 

 erly to the Magellanic Province. 



ANNOTATED LIST OF THE SPECIES COLLECTED BY R. E. COKER. 



INACHOIDES MICRORHYNCHUS Milne Edwards and Lucas. 



Plate 36, fig. I. 



Tnachoides microrhynchus Milne Edwards and Lucas, d'Orbigny's Voy. AmC'r. 



M.'r., vol. (i, pt. I, 1843, |>. 5; vol. !), alias, 1847, pi. -1, fig. 2. 



Carapace subtriangular, longer than broad, setose, convex, uneven, 

 the most elevated portions and the margins t uberculated ; postorbital 

 tooth triangular: supraorbital tooth blunt; rostrum spiniform, equal 

 in length to distance between orbits. Antennae visible beside ros- 



" Proc. 1. S. Nat. Mas., vol. 37, L909, no. 1704, p. L85. 



