PROCEEDINGS OF THE NATIONAL MUSEUM. 



45 



shorter in the west coast forms. Tliose of the first pair are from G to 

 7^ times the length of the carapace, while in the Atlantic species they 

 are from 8 to Sg times the length of the carapace. The rostrnm is 

 shorter in the specimens of L. debiUs in this collection than in most 

 of those of L. sa(jlttaria. The rostrnm is nsually abont the same 

 length as the carapace or exceeds it but little, in two instances 

 reaching a length of IJ times the carapace. Prof. Smith, however, 

 describes the rostrum of L. dehilis as abont twice as long as the 

 posterior portion of the carapace. 



In our specimens the surface is more pubescent than in L. sagittaria, 

 especially the chelipeds of adult forms, and the carapace is usually 

 more swollen at the branchial regions and the rostrum more upturned. 



A. Milne-Edwards considers the LeptopodUv from the west coast of 

 3Iexico and Central America as the same species as those from the 

 eastcoast, setting aside as distinct the Chilean form, the L. sagittaria of 

 Milne-Edwards and Lucas, and calling it L. modcsta ; consequently his 

 insertion on the same page of the L. sagitt((ria of ^lilne-Edwards and 

 Lucas in the synonymy of Leptopodia sagittaria is erroneous. Some 

 of the specimens from the Gulf of California so resemble the figure 

 given in d'Orbigny's "Voyage" that it may be proved that a single 

 species inhabits the west coast of America, which, in the present 

 state of our knowledge, it seems best to consider distinct from L. 

 sagittaria. 



The following are the dredging stations at which this species was 

 obtained : 



METOPORHAPHIS CALCARATUS, (S;iy). 



Leptopodia ailraratn, Say, Jour. Acad. Nat. Sci. Phila., i, p. 455, 1817. 



Metoporhaphis calcarafa, Stimpsox, Arm. Lye. Nat. Hist. N. Y., vii, p. 19S, 1860. — 

 Smith, Kept. U. S. Comuir. of Fish aud Fisheries for 1885 (1887), p. 620 

 {Metoporliapis calcaratiix). — A. Milnk-Edwards, op. cit., p. 174, 1878 (calca- 

 ratits). — MiEHS, Challeuffer Rept., xvii, p. 4, 1886 {MetopompMs). 



The specimens of Metoporhaphis examined represent eleven localities 

 and agree in the characters given below. 



Besides the four gastric tubercles and the large tubercle on the car- 

 diac region, there is a postorbital tubercle remote from the orbit and 

 slightly in advance of the gastric tubercles; two hepatic tubercles, one 

 of which is marginal; three branchial tul)ercles, one marginal and the 

 other two nearly longitudinal; a snbbranchial tnbei'cle in advance of 

 the marginal tubercle; the pterygostomiau ridge is provided with a 



