1923] Ralhbun, Brachtjuran Crabs of West Coast of Mexico 631 



Range. — From San Bartolome Bay, on the west coast of Lower California to the 

 Gulf of California where it has been found at Guaymas, Puerto Refugio on Angel 

 Island, and at San Luis Gonzales Bay. It was not taken by the 1911 expedition of the 

 'Albatross.' 



Hemigrapsus oregonensis, with which this species was formerly con- 

 founded, does not occur in Mexico farther south than Todos Santos Bay 

 on the west coast of Lower California just below the United States line 

 (not Todos Santos near the tip of the peninsula) . 



The genus Goetice, 1 distinguished by the form of the outer maxillipeds, 

 has not before been noted in America. Its type species, G. depressus (de 

 Haan), 2 is a common shore crab in Japan; it differs from the American 

 species in its carapace narrowed behind instead of squarish and the 

 articulation of merus and ischium of endognath of outer maxillipeds 

 more oblique. Male abdomen and chelipeds similar, except that the 

 inner surface of the palm is bare in depressus. 



Sesarma (holometopus) magdalenense Rathbun 

 Plate XXXII 



1918, Bull. U. S. Nat. Mus., No. 97, p. 305, PL lxxxvi. 



Type-locality. — MangrQve Island, Magdalena Bay, Lower California; March 

 20, 1911; 'Albatross'; 8 d> 8 9 (1 a" is type). 



Type.— Cat. No. 45793, U. S. N. M. 



Measurements. — Type male, length of carapace 11.6 mm., width between the 

 outer angles of the orbits 14.2 mm., width at postero-lateral angles 13.1 mm. 



Carapace distinctly broader than long, broadest at the outer angles of the orbit, 

 diminishing posteriorly, a very shallow sinus in the lateral margins behind the antero- 

 lateral angles. Surface for the most part smooth and shining, depressions moderately 

 deep; pits of two sorts, a few large scattered ones visible to the naked eye, and numer- 

 ous small ones, which become crowded on the anterior branchial region. On the 

 anterior and antero-lateral regions, there are a few scale-like granules. Antero- 

 lateral angle a well-marked tooth. 



Front about three-fifths as wide as carapace, surface nearly vertical, with the 

 lower edge advanced; front widening below, lower margin arcuate, outer corners 

 rounded; surface uneven, wrinkled and unevenly granulate with fine, depressed 

 granules; superior frontal lobes nearly smooth and feebly separated, the middle pair 

 the wider. 



Chelipeds of male massive; merus and carpus covered on the outer surface 

 with short granulated rugae; chelee high, swollen; immovable finger short, high, 

 horizontal; dactylus strongly arched. Palm with lower margin very arcuate, its 

 upper surface with several longitudinal, broken lines of fine granules, its outer surface, 

 as well as the upper surface of the proximal half of the dactylus, covered with fine 

 scabrous granules; fingers punctate, gaping; basal half of prehensile edge of the 



•Gistel, 'Natur. Thierreichs,' 1848, p. x. 



*Grapsus (Platynotus) depressus de Haan, 'Fauna Japon., Crust.,' 1835, p. 63, PI. vm, fig. 2, PI. D 

 (mouth-parts, Platynotus) . 



