ACADEMY OF SCIENCES. 



II ^^ 



30. ,Erii)hki sijuainata. Stimpsou. Notes on North Americuu Crustacea, p. 



10. (Auuals Lyceum Nat. Hist., N. Y.) 

 Pauama. Coiiuto, Nicaragua. 



31. Trapezia formosa. S. I. Smith. Proe. Best. Soc. Nat. Hist., Feb. 3 



1869. 

 Pearl Islands, Bay of Panama, among Poci/lopora capilata, Verrill. 



32. Trapezia ci/modoce? Guerin. Daua. U. S. Ex. Exp., p. 257, pi. XV, 



Fig. 5. S. I. Smith, loc. cit. 

 Locality the same as the preceding species. 



33. Quadrella nitkla. S. I. Smith, loc. cil. 



Localitj^ Pacheca, one of the Pearl Islands, 6 to 8 fathoms, among pearl 

 oysters. 



When Stimpsou, in 1857, published his '• Crustacea and Echinodermata of 

 the Pacific Shores of North America," not a single species of the large fam- 

 ily Portunidce bad been discovered. The same naturalist in his " Notes on 

 North American Crustacea," published in 1859, mentions one species, Lupa 

 hellicosa, Sloat, MS., but gives no description, remarking that it " agrees with 

 L. hastata in almost every character, except that the last two joints of the ab- 

 domen in the male are broader and more flattened." 



Jn February of this year I described a second species, a specimen of which 

 had been procured the preceding year at Mazatlan by Mr. Henry Edwards; 

 and I shall in this paper describe a third, of which many individuals have 

 been collected by Mr. W. J. Fishei- at various points on the Western and 

 Eastern shores of Lower C'alifornia. At Magdalena Bay Mr. Fisher procured 

 several very specimens of a Lupa, which I take to be the L. hellicosa of Sloat 

 and Stimpson, but as Sloafs MS. is not on hand, and Stimpsou gives no 

 figure, my sole reason for this belief is that the other two known species from 

 Lower California, belong to the genus Amphitr'de, as defined by Dana. 



That there may be no confusion I append a description of this Lupa. 



Lupa hellicosa:-' Sloat, MS. Stimj^son. Notes on N. Amer. Crust., p. 11. 



Carapax regulai'ly arched in its longitiidinal and transverse directions; ex- 

 ceedingly wide, the post and antero-lateral outlines forming a long ellipse; 

 no areolation except a sulcus between the median and posterior regions. 

 Central tooth of front placed low down, between the internal antennae, and 

 separated by a short, somewhat pilose, space from the front proper, which 

 has two lateral spines separated by a sinuous central portion. UiJi^er margin 

 of the orbit consisting of two long teeth, an ante and post-orbital; the former 

 highest above the outer antenn;f, and separated by a deep notch from the 

 latter, which is two-lobed, the anterior lobe low, and the jjosterior long and 

 pointed. Antero-lateral teeth nine, including the posterior lobe of the post- 

 orbital, which exceeds in height any of the others except the ninth. 2d, 3d, 



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