N0.1162. BRACHYURA COLLKCTKD BY TIIK ALHATROSS—RATll lU'N. 593 



orbital tooth is much more Jidvanced tlian tho front, and is .soi)aratcd 

 by a notch from the adjacent orbital margin. 



The merus of the left chebped (tho right is missing), is armed on the 

 anterior margin with seven acuminate spines; the proximal is very 

 snnilljthe size increasing from the (irst to the fourth; tho fourth, fifth, 

 and sixth are subetinal; the distal or seventh spiiu'> is longest, and is 

 separated from the next by the greatest interval. In the young, the 

 tliiee proximal spines of the adult are absent. Outer margin termi- 

 nating in a well nnirked si)ine. Tln^ (iarpns is armed with two spines, 

 a small outer, and an inner si)ine between two and three times the 

 length of the outer. There are two ])ropodal spines, the i)08terior in 

 the customary i)osition, and a spine near the distal end of the n|)per 

 margin. The posterior distal angle of the merus of the last pair of 

 feet is armed with a spine. 



DimeuNions. — Female : Length to tipsof teeth, 'M mm. ; width, ITtM mm. ; 

 width between posterior sinuses ol" anterolateral niaigiii, .115.5 mm. 

 Young male: Length, 11.5 mm.; width, 26.3 mm.; width between posterior 

 sinuses, 18.S mm. > 



86. PORTUNUS XANTUSII (Stimpson). 



IchelouH .rnnlitsii Stimi'SON, Ann. L.y(-. Nat. HiHt. N. V., ISdO, VII, )». 222. 

 NeptHHua xantiiHU A. Milnk-Edwakds, Arch. Mum. Hist,. Nut. PiiriH, ISfil, ,\, )>. 12!). 



From Abreojos Point to Magdalena Hay, Lower California, lih to 48 

 fathoms, stations 2831, 2834, 2835; Gulf of California. 



87. PORTUNUS (ACHELOUS) BREVIMANUS (Faxon). 



Achvloi(8 sp^nimanll>^ Faxon, Mom. Miih. (Joiiij). Zool., I8!»r), .Will, i).2:{ (not I'or- 



lunus Hpinimauus Latrcillo). 

 AoheloHs hrevimauKa Fa.\<)N, Mom. Muh. Coinp. Zool., 18})r>, XVIII, p. 2:5, in loxt. 



Noar C0CO8 Island, (5(5 fathoms. 



The characters ])i(5sented by a series of specimens from the Pacific 

 seem to Justify their specilie sei)aration from /'. spinimtvMis. P. hrevi- 

 manus is less pubescent and has a much more uneven surface; the 

 anterior branchial ridge is more strongly arched forward and the two 

 short branchial ridges are more oblicjuc than in typical spimmimns. In 

 brevimanus the median lobe of the superior orbital margin is strongly 

 produced at its outer angle; in spininianns this angles is advanced very 

 little, if at all, beyond the inner. Tlu^ inner carpal spine of the chelipeds 

 is noticeably longer, and also the merus Joint of the swimming feet, than 

 in spinimanus. Some of the specimens collected are mature, but all 

 are snniUer than the type. None have the small spintuit the distal end 

 of the i)alm, and only one spinels present at tho posterior distal corner 

 of the merus of the swimming feet. 



()(f Mood Island, ()alai)ag08, 20 and 40 fathoms, stations 2812 and 

 2813; Allxiinarle Island, (lalapagos. 

 Proc. N. M. vol. xxi 38 



