582 PBOCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



55. CANCER AMPHICETUS, new name. 

 Trichocarcinua dentatus Miers, Proc. Zool. Soc. London, 1879, p. 34. 



Magdalena Bay, Lower California, 12 fathoms, station 2831; off 

 Cerros Island, 44 fatboius, station 2838. Three specimens, too yonng 

 to be identilied with certainty, were taken off Abreojos Point, in 5^ 

 fathoms, station 2835. 



In subseqnent cruises of the Albatross, this species has been taken 

 at four stations in the Gulf of California, 12 to 3(> fathoms (stations 

 3012, 3018, 3032, 3033) ; in San Diego Bay, California, U fathoms (station 

 3591)5 in Hakodate Bay, Japan, lU and 15^ fathoms (stations 3650 and 

 3G59) ; and in the Culf of Tokio, 100 fathoms (station 3001). The species 

 was also collected at Fusan, Korea, by Mr. 1\ L. Jouy. 



56. ACT.<EA ANGUSTA, new species. 

 (Plate XLII, lig. 2.) 



Carapace narrow, posteriorly lohulateil; lateral lobes dentiform; fingers 

 ronyh. 



Carapace narrow, slightly convex, lobulate on the imsterior as well 

 as the anterior half; lobules granulous. The posterior half of the 

 mesogastric region is long, and its sides are distinctly convergent back- 

 ward; the depressions which form its lateral borders are continued 

 posteriorly in divergent lines, thus forming a figure the shape of an 

 hour-glass. On either side of this there is a large branchial lobule, 

 not distinctly limited posteriorly. Front slightly deflexed, its margin 

 visible in a dorsal view: lobes obli(j[ue, nearly straight, separated by a 

 broad V-shaped notch. Lateral lobes four, besides the orbital, denti- 

 form, the first verv short, the second twice as long, the third much the 

 longest. Inner suborbital lobe rounded, prominent. 



Chelipeds covered with spiniform tubercles, the carpus deeply 

 grooved, tlie tubercles on the hands arranged in longitudinal rows. 

 Fingers deeply grooved, the intervening ridges rough with spiniform 

 tubercles. Ambulatory legs granulate. 



JHrnensions. — Female: Length, 4.5 mm.; width, mm. 



Type. — No. 21578, U.S.N.M. One immature female, oft" Hood Ishmd, 

 Galapagos Islands, 20 fathoms, station 2812. 



This species resembles A. seiigcra (Milne-Fd wards) and A. dorii 

 Stimpson in the ornamentation of the carapace and in the chelipeds; it 

 differs from them in being narrower and posteriorly areolate.d, and hav- 

 ing dentiform lateial lobes. It resembles A. bi/rons Bathbun in its 

 proportions and lateral lobes, and differs in its front, posterior areola- 

 tious, and roughened and grooved fingers. 



