COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 209 



Streptochirus does not seem to have appeared subsequently in the liter- 

 ature. Porcellana serratifrons Stimpson, 1858, is hereby designated as 

 its type species. 



Pisidia magdalenensis (Glassell) is the sole eastern Pacific repre- 

 sentative of this genus; among related species formerly included in 

 Porcellana are Pisidia lo?igicornis (Linnaeus), 1766, P. bluteli (Risso), 

 1816, P. dehaanii (Krauss), 1843, P. suluensis (Dana), 1852, P. 

 spinuligera (Dana), 1853, and P. streptocheles and serratifrons (Stimp- 

 son), 1858. 



Pisidia magdalenensis (Glassell), new combination 

 Plate 38, fig. 4; text-fig. 10 



Porcellana magdalenensis Glassell, 1936, p. 295 (type locality, Bahia 

 de la Magdalena, Baja California, Mexico) ; 1938a, p. 431, pi. 32. 

 Haig, 1957b, p. 14. 



Previous records: 

 Baja California. Bahia de la Magdalena: S. A. Glassell (Glassell 1936). 

 Mexico. Bahia de Acapulco: W. Williams on Stranger (Glassell 1938a). 

 Panama. Isla Perico: Albatross (Glassell 1938a). Isla Contadora and 



Isia Saboga, Islas de las Perlas: Askoy (Haig). 

 Colombia. Bahia Utria; Bahia IVIalaga: Askoy (Haig). 



Diagnosis: Carapace spinulate on lateral and orbital margins; front 

 with three rounded lobes, spinulate on their margins; carpus with an- 

 terior margin sinuous, spinulate ; fingers of major cheliped straight, 

 meeting entire length or nearly so ; fingers of minor cheliped widely 

 gaping, dactylus strongly curved and contorted. 



Description: Carapace about as broad as long, covered with light 

 or strong transverse plications ; regions distinct ; surface with a light 

 pubescence, forming long tufts on protogastric regions and sometimes 

 scattered tufts elsewhere anteriorly. Frontal lobes about equal in breadth, 

 minutely spinulate on margins ; lateral lobes rounded, median lobe con- 

 siderably produced beyond them, with a strong median groove, tip 

 pointed but slightly deflexed and appearing rounded in dorsal view. 

 Orbits shallow, oblique, margined with spinules; outer orbital angle not 

 strongly produced; hepatic margin with from three to five spinules, 

 posterior one largest ; epibranchial angle strongly projecting, sometimes 

 margined with minute spinules. Lateral spinules posterior to cervical 

 groove distinct. 



Inward projection of basal segment of antenna spinulate on its an- 

 terior margin, the spinules visible in dorsal view; first movable seg- 



