4 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



son, F. E. Durham; J. L. Mohr, J. S. Garth, C. L. Hubbs, B. C. Wal- 

 ton, M. E. Pippin, J. Haig, and J. W. Knudsen. 



Specimens from the west coast of Baja California were collected by 

 E. Y. Dawson and F. E. Durham in 1946, by a Hancock Foundation 

 field party in 1947, and by L. O. Miles in 1950. Material from the Gulf 

 of California came from E. Y. Dawson and F. E. Durham in 1946; B. 

 W. Halstead in 1949; C. Limbaugh in 1950; E. Y. Dawson in 1951 and 

 1952 ; R. J. Menzies and G. Ewing in 1953 ; a Hancock Foundation field 

 party in 1954; J. W. Knudsen, participating in a California Fish and 

 Game cruise, in 1955 ; and R. Hardy in 1956. Collections from the 

 southern Mexican mainland were made by C. L. Hubbs in 1946 and by 

 E. Y. Dawson in 1946-47. A cruise sponsored by Patrick A. Doheny, 

 with J. W. Knudsen as carcinological collector, obtained specimens in 

 the Gulf of California and Mexican offshore islands in 1956. Porcel- 

 lanids collected at Clipperton Island in 1954 by the Scripps Institution 

 of Oceanography Expedition (Hertlein and Emerson, 1957) are housed 

 in the Hancock Foundation, as are most of those from dredge stations 

 occupied by the Zaca during the New York Zoological Society's 1937-38 

 expedition to Central America. 



Other institutions : In addition to the large and varied material avail- 

 able for study at the Hancock Foundation, a number of collections be- 

 longing to other institutions were examined; data on these specimens 

 appear in the Tables, Appendix I. Of particular value to the study were 

 specimens derived from areas in which the Velero porcellanids are less 

 well represented, notably southern Mexico and Central America; and 

 specimens from Chile, which lies beyond the southern limit of Hancock 

 Foundation explorations. The porcellanids of the Askoy Expedition to 

 Panama, Colombia, and Ecuador, 1941, and the Lund University Chile 

 Expedition, 1948-49, were previously studied by the writer (Haig, 

 1957b, 1955) and have aided materially in the preparation of the present 

 report. 



An interesting find from the historical standpoint was a series of 

 about 1,160 specimens, divided among 15 species, obtained by J. 

 Xantus at Cabo San Lucas, Baja California, at the mouth of the Gulf 

 of California. These specimens are housed in the Museum of Compara- 

 tive Zoology, Harvard University. In 1862 and 1871 Stimpson described 

 many new species of Crustacea from Xantus's Cabo San Lucas collec- 

 tions, but did not study the Porcellanidae. Had he done so, many more 

 west American crustacean species would now have Cabo San Lucas as 



