RECENT OPHIURANS. 233 



rather small, narrow, flattened, blunt and erect. Under arm-plates wider than 

 long but almost square, with rounded corners, broadly in contact throughout. 

 Side arm-plates small, carrying series of five arm-spines; the number falls to 

 four near the middle of the arm; these spines are short, about equal to a joint, 

 flattened, blunt and subequal; the next to the lowest spine is the widest, flattest, 

 and most truncate of all, particularly near the middle of the arm. Tentacle- 

 scales wanting. Color (di'ied from alcohol), whitish or very pale brown. 



HoLOTTPE (M. C. Z. 1361). Japan: mouth of the Bay of Yeddo. E. S. 

 Morse collection. 



Mr. Lyman left with this specimen a couple of sketches of details, with the 

 note "6 spines, lowest longest" and the label "Amphiura." I fail to find 6 

 spines on even one joint, nor can I call the lowest the longest but Mr. Lyman's 

 note was, no doubt, the result of only a hasty examination. This species is very 

 near the Australian species perplexa (hence the name) so far as I can judge from 

 Stimpson's description of that form, but the arm-spines are apparently quite 

 different and prevent us from uniting the two under one name. 



499. A. TRACHYDISCA H. L. Clahk, 1911. Bull. 75 U. S. N. M., p. 149, f. 60. 



25 specimens, including 12 paratypes. Japan ^: Port Hida, 167 fms.; 

 Uraga Channel, 70-88 fms. 



Species of Amphiura not represented in the M. C. Z. 



500. a. ABBREVIATA Koehleb, 1905. Siboga-exp. Oph. litt., p. 34, pi. 4, f. 3-5. Dutch East 



Indies: Paternoster Islands, 15 fms. Aru Islands, 7-8 fms. Sulu Archipelago, 9-21 fms. 



501. A. ABYSSORUM Nokman, 1876. Proc. Roy. soc. London, 25, p. 215. Northeastern Atlantic, 



1785 fms. 



502. A. ACCEDENS Koehleb, 1910. Senckenb. naturf. gesellsch., 33, p. 293, pi. 15, f. 4, 5. Aru Is- 



lands: Sungi Barkai, 8-9 fms. 



503. A. AESTUAE-II Matsdmoto, 1915. Proc. Acad.nat. sci. Phil.,67, p. 73. Japan: Misaki, Aburat- 



subo Cove. 



504. A. AGITATA Koehler, 1904. Siboga-exp. Oph. mer prof., p. 79, pi. 13, f. 5-7. Sulu Archi- 



pelago: north of Sulu Islands, 153 fms. 



505. A. ALGIDA Koehler, 1911. Brit. Ant. exp. Rept. sci. invest., 2, p. 46, pi. 7, f. 14, 15. Antarc- 



tica: Victoria Land, Ross Island, Cape Royds, 10-80 fms. 



506. A. AMBIGUA Koehler, 1905. Siboga-exp. Oph. htt., p. 39, pi. 4, t. 9-11. Sulu Archipelago: 



off Tongkil Island, 7-8 fms. 



507. A. .ARGENTEA Lyman, 1879. Bull. M. C. Z., 6, p. 21, pi. 11, f. 288-291. North of the Ker- 



madec Islands, 600 fms. 



508. A. ATLANTICA Ljungm-in, 1867. Ofv. Kongl. Vet.-akad. Forh., 23, p. 321. St. Helena. 



509. A. BELGICAE Koehler, 1900. Bull. Acad. Belgique, p. 819. 1901. Belgica Ech. et Oph., p. 



27, pi. 7, f. 46-48. West Antarctica, 55-168 fms. 



' Without definite locahty. 



