228 RECENT OPHIURANS. 



480. A, LUNARIS Lyman, 1878. Bull. M. C. Z., 6, p. 226, pi. 2, f. 31-33. 



3 specimens, including holotype and 1 paratype. Gulf of Mexico, 955 

 fms. Off St. Vincent, 424"fms. 



481. A. LtTI^ENI Duncan, 1879. Journ. Linn. soc. Zool., 14, p. 464, pi. 10, t. 17. 



2 specimens. Philippine Islands. Identity? 



482. A. MAGELLANICA Ljungman, 1867. Ofv. Kongl. vet.-akad. Forh., 23, p. 320. Koehler, 



1908. Trans. Roy. soc. Edinburgh, 46, pi. 11, f. 104. 



12 specimens. Northeastern Patagonia, 30 fms. Patagonia: near Gulf 

 Matias, from kelp. 



483. A. MEDITERRANEA Lyman, 1882. ChaUenger Oph., p. 142. Plate 4, f. 5, 6. 



5 coTYPES. Naples. Nice. 



484. A. MICROSOMA, sp. nov. (iuKp6s, small + (rUfia, body). Plate 5, f. 5-7. 



Disk 5 mm. in diameter; arms 50-55 mm. long; the body seems dispro- 

 portionately small (hence the name). Upper surface of disk covered by a dark 

 skin in wliich are imbedded numerous minute scales, which are largest and most 

 easily visible about the radial shields. The latter are three times as long as 

 wide but are scarcely half as long as radius of disk; the two of a pair are approxi- 

 mately parallel and separated altogether or barely in contact distally. Upper 

 arm-plates, somewhat ellipsoidal, much wider than long (except the first 6-8), 

 broadly in contact throughout. Interbrachial spaces below covered with a 

 loose, soft skin, which, when dried, is seen to be full of minute scales. Genital 

 slits moderate and inconspicuous. Oral shields, wider than long, diamond- 

 shaped with somewhat rounded angles. Adoral plates small, not meeting 

 proximal to oral shield but separating it from the side arm-plate. Oral papillae 

 as in typical Amphiura, a thick squarish subdental pair and a pointed scale- 

 like one on the inner end of the adoral plate; the latter is quite small and not 

 easy to detect on all the adoral plates of the specimens in hand. First under 

 arm-plate very small, barely separating the adjoining adoral plates; succeeding 

 plates, squarish with rounded angles, in contact, longer than wide or length and 

 breadth about equal. Side arm-plates not conspicuous and not meeting either 

 above or below; each plate carries 5 (distally 4) blunt, arm-spines, of which 

 the lowest is the stoutest, while the uppermost is somewhat less thick but is 

 about as long; these two spines are about as long as an arm-joint while the inter- 

 mediate three (or two) are a trifle smaller in every way. Tentacle-scale single, 

 rounded, scale-like. Color in life: — radial shields whitish; naked skin of disk, 



