'"jKyr'J i'ko(.'i:ki)IN(;s of Tii'<: national museum. 97 



The. (lolor is a dusky biick-i<'<l al)<>v«'; whitish below. The tliiiiciisioii.s 

 oCii male Crom the Ar-ctic Ocean, north of Boring Straits, siro: Lcn^tli 

 <)l<'arai)ax, li.<sr); ^icatcst Incadlh, LMli; j>Teatcst posi -orbital breadth, 

 1.7."); breadth at constrii-tion, l.ilU inclies. 



Tliis species was found by ns in ^reat nund)ers in all parts of the 

 North Pacific ()c<'a.n uoith of the parallel of 5(r'. The followinj;- locali- 

 ties uuiy be inentione<l: Seai of Ochotsk; Avatscha Hay and otfChe- 

 poonski Noss, cosist of Kaiutschatka; off Mat wi Island; in Behrinj^ 

 Straits, ainl in the Ai-ctic Ocean. It occurred on all kinds of bottom, 

 from low-water mark to a (b'pth of oO fathoms or more. Amonj;' sev- 

 eral hundred specimens of this s])ecies, not one of /f. aranea wuh fouiul, 

 althou^^h this latter sjx'cies is said l)y lii'audt to occur in the sea: of 

 Ochotsk. 



The sjK'cinu'us from the waters of Avatscha Bay, which are somewhat 

 brackish, do not ditfer from those taken in the open sea. 



Brandt, in the Zoiilogy of Mi(hleiidorff's lieise in den Sibiriens, Part 

 1, paji'e 78, describes a Ily<(.s IVoni the Sea of Ochotsk, which he consid- 

 ered a vai'iety {alutaccu.s) of JI. coarctatus. lie states, however, that 

 it ditt'ers from the Atlantic form in the somewliat more strongly granu- 

 lated (stiirkercha<;riniite) upper surface of the cai'a])a.x ; iutlui broader 

 posteiior sideof the body, and in the broader hands. These (;haracters 

 are certainly not those of our species, and for this reason we have not 

 a])i)lied to the Pacific form the name <iliif(i<riis. In some of the larger 

 six^ciuu'us the surface is indee<l granulated to some extent, particularly 

 at the summits of the swelliugs; but s|)eciniens of ordiuary si/e are 

 always uuich smoother than any from the Atlantic. It is not impossible, 

 therefore, that there is still another sj)ecies in the North Bacific. 



(iciius MICROPISA Stiiii|is()n.' 



It has been found uecessary to iustitute a new genus for tJie n^'cp- 

 tioii of a small /'/.svf like crnstaceau which was taken in considerable 

 uund)ers at the ('ape de Verde Islands. It has a short and broad 

 ovate carai)ax and tiattened rostrum. The orbits are much less com- 

 plete than in Pirn, and have a single fissure above. It r(^seud)les IScyra 

 in many respects, but the external antenna' are not concealed beneath 

 the rostrum. The outer maxilli[)eds resemble soiiunvhat those of Pisa; 

 but the outer angle of the abnost heart-sluiped third Joint is strongly 

 l)rojecting, and there is no notch for the n^ception of the fourth joint; 

 the i)alpus is broad. 



Micropisa ovata Stiinpsou. 



Proc. Arad. Nal. Sci., Phila., ix, p. L'17, lsr>7. 



In this little crab the carai)ax is rather depressed, and but little 

 longer than broad. The regions are sufficiently prominent, but gener- 

 ally smooth and rounded; there are, however, three inconspicuous pro- 



*Not difstinct from llcrhstia. — M. J. K. 



Proc. N. M. 93 7 



