SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



SPECIFICALLY DETERMINED CLIPPERTON ISLAND DECAPODS 



Indo-Pacific species Species with Indo-Pacific ties 



Crangon pacificus C rang on hawaiiensis clippertoni 



Lysmata paucidcns Crangon paracrinitus variety 



Pachygrapsus minutus Brachycarpus biungniculatus 



Percnon abbreviation Thalamita rooscvclti 



West American species 



Synalpheus nobili 

 Pomagnathus coral linns 

 Callianassa hartmeyeri 

 Pefrolisthcs marginatum 

 Pachychclcs bioccllatns 

 Gccarcinns planafits 

 Platypodia rotnndata 

 Ac tea dovii 

 Actea sulcata 

 Micropanopc xantusii 

 Teleophrys cristulipes 



In keeping with the presence of the South Pacific genus of skink, 

 Emolis, on Clipperton, where this genus is represented by E. arundelii 

 (Garman), is our discovery of (i) the first New World Thalamita, 

 (2) a new species of terrestrial amphipod (see footnote 4, p. 7) not 

 far removed specifically from Orchestia marqucsana Stephensen, of 

 the Marquesas Islands, Oceanica, and (3) the littoral crab, Pachy- 

 grapsus minutus Milne-Edwards, originally described from New 

 Caledonia. 



In order to avoid needless repetition of station data, the species, 

 together with pertinent remarks and descriptions of the new forms, 

 have been listed in systematic order under the several localities at 

 which they were taken. 



I am greatly indebted to Dr. Mary J. Rathbun, Associate in Zoology, 

 United States National Museum, Smithsonian Institution, for assis- 

 tance in naming the brachyuran Crustacea ; and to Steve A. Glassell, 

 of Beverly Hills, Calif., for the identification of the representatives 

 of the porcellanid genera Petrolisthes and Pachycheles, as well as of 

 the pinnotherid crab, Pinnaxodcs. Dr. C. B. Wilson, of Westfield, 

 Mass., determined the free-swimming and parasitic copepods collected. 

 A single leptostracan, Kcbalia bipes (Fabricius), was sorted from 

 the Magdalena Bay dredgings. 



I shall always be grateful to President Roosevelt for the wonderful 

 opportunity he afforded me for gathering the scientific material 

 reported in the series of papers of which this is one. 



ANNOTATED LIST OF THE CRUSTACEA 



Cedros Island, Lower California, Mexico, July 17 (sta. 1-38) ; 

 shore collecting, both north and south of cannery east side of island. 



Pachygrapsus crassipes Randall 44 J 1 37$ (11 ovig.) 



