CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 1 25 



It was taken in the seine on sandy shores near the mouths of 

 streams in the Bay of Hakodadi, Island of Jesso. 



207. ERIOCHIRUS RECTUS ' Stimpson 



Briochirus rectus Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 103 [49], 

 1858. 



Carapax depressed, broad posteriorly, narrowing anteriorly ; 

 length to greatest breadth as i : 1.06. Surface somewhat uneven, as 

 in B. japonicits, but smooth and punctate. Pregastric lobules little 

 salient. Front waved, indistinctly four-lobed ; median sinus very 

 shallow. Lateral margins nearly straight, converging ; four teeth on 

 each side, the posterior one rudimentary. Outer maxillipeds and 

 pterygostomian regions pubescent. Chelipeds of moderate size ; 

 meros with granulated edges, the tooth near its summit very small ; 

 carpus with the encircling ridge of upper surface pubescent, and the 

 tooth at the inner angle small ; hand with a thick tuft of hair on 

 outer surface ; fingers strongly sulcated. The first three ambulatory 

 feet are slender toward their extremities. The meros-joint of the 

 ambulatory feet is ciliated above. The dactyli are shorter than in 

 B. japonicus and less curved. Dimensions of the unique female 

 specimen described : Length of carapax, 0.92 ; breadth, 0.975 ; length 

 of third ambulatory foot, 2 inches. 



It is allied to B. japonicus, but is more depressed, and easily dis- 

 tinguished by its straight converging sides and less distinctl}' lobed 

 front. 



Taken near ]Macao, China. 



Genus HETEROGRAPSUS (Lucas) ^lilnc Edwards 



This genus was first proposed by Lucas in 1849, ^^^t has only re- 

 cently been illustrated and placed on a firm basis by Milne Edwards, 

 in his "AFclanges Carcinologiques." The genus Hemigrapsiis of 

 Dana is composed in part of Hctcrograpsi, but his Hoiiigrapsiis 

 crassiniaiuis and H. affinis seem to us to belong more properly to Cyr- 

 tograpsus of the same author, a very distinct and well-marked genus 

 (notwithstanding it is disregarded by ■Milne Edwards), forming a 

 passage to the \'arunaccre. Pseud ograpsus iiiidus and P. orcgoiicn- 

 sis of Dana will fall into this genus. In these crabs the meros of the 

 outer maxillipeds is not auriculated, as in Pscudograpsus proper. 



' Erioclicir rectus Stimpson. 



