COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 193 



MINYOCERUS Stimpson 1858 



Minyocerus Stimpson, 1858, p. 229 (type species Porcellana angusta 



Dana, 1852, by original designation). 

 Porcellina Miiller, 1862, p. 194 (type species Porcellina stellicola 



Miiller, 1862, bymonotypy). 



Carapace longer than broad, markedly convex transversely; upper 

 surface with distinct transverse striations. Front prominent, broad, tri- 

 dentate. Orbits deep; outer orbital angles strongly produced; eyestalks 

 stout, retractile. 



Basal segment of antenna produced forward and broadly in contact 

 with anterior margin of carapace ; strongly produced inward, forming 

 a partial suborbital margin. Movable segments minute and flagellum 

 rudimentary, their total length less than or scarcely exceeding width 

 of eye. 



Basal segment of antennule longer than broad, anterior margin with 

 strong teeth visible in dorsal view. 



Chelipeds rather small ; carpus short and stout ; manus long and nar- 

 row, its margins subparallel, much longer than fingers, latter opening 

 obliquely. 



Walking legs subcylindrical; no posterior movable spinules on pro- 

 podus; dactylus ending in a simple spine, without movable accessory 

 spinules on posterior margin. 



Telson of abdomen a little longer than broad, composed of seven 

 plates. 



Contains two species, one on either side of the American con- 

 tinents. 



Minyocerus kirki Glassell 

 Plate 37, fig. 1 ; text-fig. 8 

 Minyocerus kirki Glassell, 1938a, p. 430, pi. 31 (type locality, San 

 Felipe, Gulf of California). 



Previous records: Gulf of California. San Felipe: S. A. Glassell 

 (Glassell). 



Diagnosis: Carapace about one and a third times as long as broad, 

 transversely striate ; front tridentate, teeth approximately equal in length 

 and breadth; movable segments of antenna minute and flagellum rudi- 

 mentary, their total length less than or scarcely exceeding width of 

 eye, visible only under magnification; carpus of cheliped with a strong 

 spine at about center of anterior margin, often followed by several spin- 

 ules. 



