282 Transactions. — Zoology. 



angular, imbricated, each bearing a cluster of three or four slender spines 

 on the inner edge, and two or three smaller ones on the outer angle, not 

 forming regular rows. Ventral plates densely covered with minute rough 

 spines, each having also a central series of sharp spines, the inner ones very 

 small, increasing outwardly to the external, marginal ones, which are 

 strong, sharp, and slightly curved upward, i inch long. The lower mar- 

 ginal plates are opposite the upper, and project considerably beyond them. 

 The latter are elevated and narrow, twenty-eight on each side of a ray, the 

 two at the angle between the rays much higher and larger, covered like the 

 rest with rough rounded granules, and each surmounted by a stout, blunt 

 tubercle. All the others, except the next two, bear a similar, much smaller 

 tubercle, decreasing regularly in size to the end of the ray. The two next 

 the basal one of each ray are thinner than the rest, and without a tubercle. 

 Paxillffi largest along the centre of the rays, presenting a crowded even 

 surface. 



Length of ray from centre 2-6 inches, radius of disc '6, width of ray at 

 base "7, of median space '4. 



Auckland, New Zealand. — H. Edwards. 

 Ophiaeachna maculata, Verrill.* 



A large yellowish brown species, with stout arms, finely spotted with 

 darker on the upper surface. 



Eadius of disk to that of arms as 1 : 9 or 10. 



Disk large and thick, the inter-radial regions swollen and a smaller lobe 

 bordering each side of the arms at base ; upper surface and inter-radial 

 spaces below covered throughout with small, closely crowded, rounded, or 

 slightly polygonal granules ; radial shields not visible ; at the base of each 

 arm a few naked, imbricated, unequal scales. Mouth-shields broad cordate, 

 broader than long, the inner end obtusely rounded, the sides slightly in- 

 curved, the broad outer end emarginate. The accessory plates outside the 

 mouth-shields either two and nearly equal, or three and unequal, in the 

 same specimen ; when there are two they form together a narrow, slightly 

 oblong ellipse, much narrower than the mouth-shields ; when there are 

 three, the middle one has a broad, rounded triangular form, and the two 

 lateral pieces are small, unequal, and irregular in size and form. Mouth- 

 papillse seven or eight on each side of the mouth, the inner one elongated, 

 irregularly oval, somewhat pointed ; the next much larger than the others, 

 broader than long, somewhat quadrilateral and irregular, the outer edge 

 narrower and flattened ; the third a little longer than the first, irregular in 

 form, somewhat pointed at each end ; the three or four following are a little 

 smaller, and about equal in size and similar in form, rather oblong, some- 



* From the Pro. Boston Soc. of Nat. Hist., Vol. XII., April 7th, 1869, p. 388. 



