90 
the subsequent study of a considerable amount of material obtained by H. M. S. S. 'Challenger' 
and 'Alert', and also by Dr. J. Anderson, F. R. S., of the Calcutta Museum, has convinced me 
that the two types are really identical. MCller hardly ever made any comparison of his species 
with one another, but simply contented himself with descriptions, leaving his readers to determine 
the real points of difference between his various species The differences between Comatiila 
milberti and Coniahila jacqiiinoti as described b)- Miller, are in reality exceedingly slight. 
The number of cirrus joints, the character of the radials and of the arm joints, the colour, 
and even the size are respectively identical in the two types. Cornattda milberti has twenty-five 
to thirty cirri with the spines transverse, while in Coiiiatula jacqintioti there are twent)'-two 
cirri with the spines directed forwards. In Coiiiatida milberti the syzygial interval is eight or 
nine joints, and the second, third and fourth pinnules are the largest, while in Co))iatula jac- 
quinoti the syzygial interval is three to six joints and the first three or four pinnules are 'starker'. 
Neither of these characters, however, nor even the combination of them, can be regarded as 
of specific value, especially w'hen we remember that each of Moller's species was based upon 
a single specimen. That of Coiiiat7ila Jacqicinoti had been obtained at Ceram by the expedition 
of d'lJRViLLE in the "Zelee" (1S41), while the form which Muller described under the specific 
name milberti had previously received it from Valenciennes in honour of M. Milbert of New 
York, who had given it to the Paris Museum ; and it was possibly for this reason that the type 
was labelled as coming from North .America. Under these circumstances Valenciennes, and 
after him Muller, were perhaps a little predisposed to regard it as distinct from the Comatiila 
jacqtiinoti of Ceram, which Muller described along with it and in such nearly identical terms". 
On the basis of Carpenter's statement we would be justified in considering jacquinoti 
a synonym of milberti^ as he did. But unfortunately he included under the name milberti in 
the "Challenger" report, in addition to jacquinoti^ the species which we now know as molleri 
and discoidea, later adding laevipinna. It is by no means certain, therefore, that according to 
the present standards jacquinoti would be considered identical with milberti. What the latter 
really is must be left for future investigation to determine. 
Locality. — Supposed to be North America; the type was brought from New York; 
but the genus, as well as the family to which it belongs, is exclusively Indo-Pacific. 
11. Amphimetra siiiensis (Hartlaub). 
Hartlaub. Mem. Mus. Comp. Zool., vol. 27, 1912, N"4, p. 378, pi. i^, fig. 4 [Anledon sinensis). 
A. H. Clark. Proc. Biol. Soc. Washington, vol. 26, 19 13, p. 179 (Ainphitnetra sinensis). 
Remarks. — Dr. Hartlaub places this species near Ampkimctra milberti, but from the 
description it would appear to belong to the Colobometridae, falling possibly in the genus Decametra. 
Locality. — Hong Kong. 
12. Amphimetra tessellata (J. Muller). 
J. Muller. Monatsber. d. k. preuss. Akad. d. Wiss., 1841, p. 184; Archiv fur Naturgesch., 
1 84 1, I, p. 144 [Alecto tessellata). 
Abhandl. d. k. preuss. Akad. d. Wiss., 1841 (1843), p. 224 (Alecto tessellata). 
