REPORT ON THE ASTEROIDEA. 253 
and sometimes a second pair stand immediately below these, in the place of the first 
actinal or superficial spines. The marginal spines and actinal spines are subequal to 
one another in size, and diminish as they recede from the mouth; the actinal spines 
forming a series parallel to the median suture of the mouth-plates. 
The actinal interradial areas are very small, and do not contain more than two or 
four small intermediate plates, which bear either a forficiform pedicellaria or a croup of 
small ciliary spinelets. 
The madreporiform body is hidden by paxille. 
Colour in alcohol, varying between light yellowish drab and dirty greenish grey ; 
with a very dark broad band, almost black in some specimens, dark sage green in others, 
along the median radial line, extending to the centre of the disk, in some specimens fading 
out gradually at the sides, in others terminating more abruptly. At the extreme tip of 
the ray the whole area is of this dark colour, whilst the ocular or terminal plate is white, 
and hence very conspicuous. 
Locality.—Yokohama. May 6, 1875. Depth 5 to 25 fathoms. 
Remarks.—This species is perhaps most nearly related to a Luidia from Singapore, 
preserved in the University Museum at Copenhagen, which bears the manuscript name of 
Inidia chefuensis, Grube; but the two forms are distinguished by a number of well- 
defined characters. In Luidia limbata the paxille are larger and more definitely square, 
and the lateral spine is of a different shape. The armature of the adambulacral plates is 
different, wanting altogether the comb of four or more spinelets running parallel to the 
furrow, which in Lwidia chefuensis succeeds the two single curved spinelets. In like 
manner there is no trace of the second comb, parallel to the furrow, of four to six ciliary 
spines, probably situated on the intermediate plate between the infero-marginal and 
adambulacral plates. 
I should here state that I have not been able to find any published description of the 
species now mentioned under the name of Imidia chefuensis. 
In the University collection at Breslau there is another Lwidia, which bears the 
manuscript name of Luidia singaporensis, Grube, but which seems to me to be the same 
as von Martens’ Luidia maculata, var. quinaria, and different from Lwidia chefuensis. 
I am inclined to think that the so-called variety quinaria of Dr von Martens is really 
a species distinct from Luidia maculata. 
4, Iwidia clathrata (Say), Liitken. 
Asterias clathrata, Say, 1825, Journ. Acad. Nat. Sci. Philadelphia, vol. v. p. 142. 
Luidia clathrata, Liitken, 1860, Videnskab. Medd. naturh. Foren. i Kjgbenhavn for 1859, p. 37. 
Locality.—Challenger Expedition: Bahia. Depth 7 to 20 fathoms, 
Other Localities—North Carolina, South Carolina, Florida, Martinique, Hayti, St 
Thomas, Rio Janeiro, 
