446 PROCEEDINGS OF UKITED STATES NATIONAL MUSEUM. llfiS:>. 



arm-spiues, four or five near the disk, usually four along the middle 

 and three toward the tip of the arms ; they are subequal in length, 

 the upper one a little longer and more enlarged toward the base, the 

 tips obtuse and minutely roughened or spinulose on one side. Tenta- 

 cle-scale absent or rudimentary. Mouth-shields small, rounded ; side 

 mouth shields rather broad. Mouth papillae, four to each angle; a pair 

 of large, stout, blunt ones stand at the end of the jaw, and a much 

 smaller, spiniform, acute one a little farther back on each side; there 

 is also an acute spiniform, erect papilla outside of the mouth-tentacle, 

 opposite the outer angle of the mouth-slits, as in A. Otteri. Ventral 

 arm -plates, subquadrate, longer than broad, with the outer angles 

 rounded and the inner ones truncated; farther out they become shorter 

 and somewhat five-sided, with the outer margin rounded and the inner 

 corners so much truncated as to form a median angle. Diameter of 

 disk of an ordinary specimen, 5™'" ; length of arms, about 30"'™. Ee- 

 sembles the young of A. Otteri, but differs in lacking tentacle-scales 

 and in having the disk naked below, and in the arm-spines, which are 

 not curved. 



Off Martha's Vineyard, in 239 to 1,467 fathoms, 1883, 1884. 



Ophioscolex quadrispinus Verrill, 18H4. 



Verrill, Eeport U. S. Fish Com. for 1883, p. 48, figs. 56,56a, 56&, 1885. 



Disk swollen; arms five, long, attenuated distally. The disk and 

 base of arms are covered with a thick, soft skin, with close wrinkles or 

 small rounded verrucae above, becoming concentric and radial wrinkles 

 beneath, but beyond the basal part of the arms becoming smoother and 

 thinner, concealing the feebly developed arm-plates. Arm-spines four, 

 or alternately three and four, near base of arms (three in young exam- 

 ples), nearly equal, rather stout, tapered ; lower ones blunt; upper, acute 

 in part, scarcely as long as the breadth of the arm. Tentacle-scale small, 

 tapering, acute ; teeth, six to eight or more, rather slender, acute, often 

 in pairs ; mouth-papillae, small, slender, acute, unequal, eight to ten on 

 a side of each angle, besides two or three larger ones outside of the sec- 

 ond mouth-tentacle and one within the slit at the first mouth-tentacle; 

 the outer papillne in large specimens are crowded so as to form two or 

 more rows. Large examples have the disk 14™™ in diameter ; length of 

 arms, 70™™. 



Off Martha's Vineyard to Nova Scotia, in 101 to 234 fathoms (101 fath- 

 oms, off Nova Scotia, 1883). Stations 1121 and 2069 ; also Gulf of Maine, 

 station 38, in 112 fathoms, 1878. Rare. 



Hemieuryale tenuispina Verrill. Report U. S. Fish Com. for 1883, p. 48, 1885. 

 Astromjx? tenuisjnna Verrill, Amer. .Journ. Sci., vol. xxviii, p. 219, 1884. 



The disk is covered with thin, roundish scales, visible when dried, 

 without granules ; radial shields prominent distally ; arms with small 

 scales above, and larger prominent ones along the sides ; spines three, 



