52 BTJLLETIK 84, UNITED STATES NATIONAL MUSEUM. 



Connections and differences. A. rathbuni belongs to the group of Amphiura 

 s. str. in which the under face of the disk is deprived of a regular covering of plates 

 (Hemilepis) and which possesses two tentacular scales. The shape of the second 

 ventral spine prevents its being mistaken for A.flexuosa, from which it also differs 

 by its mouth shields being lozenge-shaped, and by its upper and under brachial 

 plates being broader. The shape of the second spine recalls that of A. latispina, 

 but in this latter species the last two dorsal spines are large, very much widened 

 and flattened, while they are here slender and cylindrical; the mouth shields, as 

 well as the upper and under brachial plates, are also differently shaped. 



A. rathbuni differs still more from the other species of the same group. 



It gives me great pleasure to dedicate this new species to Dr. Eichard Eathbun. 



AMPHIURA KINBERGIENSIS, new species. 

 Plate 4, figs. 3-4; plate 5, figs. 1-2. 



t Amphiura kinbergi LJUNGMAN (71), p. 643. 

 Amphiura palmeri K^HLER (07a), p. 279. 



Fisti Hawk station 7512. Mar. 25, 1903. 3f miles southeast by east of Fowey 

 Rocks Light, Florida; 170 fathoms; sft. Four specimens. 



Type Cat. No. 32292, TJ.S.N.M. 



I am almost certain that the Amphiura which I am going to describe is identical 

 with the one named A. Tciribergi by Ljungman in 1871, and which he says comes from 

 the southern region of Brazil, without mentioning any depth. Unfortunately, 

 Ljungman has given no description of that species; he only mentions it in the table 

 of the species of Amphiuridae of the Atlantic, and he classifies it, with A. latispina, 

 among the Amphiurse which have the under face of their disks bare, and which 

 possess two tentacular scales. Both species are characterized by him as having 

 "spinae brachiales obtusae plus minus complanatae latiusculae," and Ljungman says 

 only of A. kinbergi: "Spinae brachiales ad infimam proxima recta, in apice truncate, 

 aculeolis minutissimis lateralibus instructa (quasi securiformis)," the two sentences 

 constituting all the description of A. "kinbergi; the number of spines is not men- 

 tioned, but it is certainly near that of A. latispina. 



Such is the only information we have concerning Amphiura kinbergi, which 

 must not be mistaken for the Amphipholis Tdribergi, which was also described by 

 Ljungman, and which, by the way, ought to be united with A. squamata. I had 

 asked Professor The'el to lend me Amphiura kinbergi of the Stockholm Museum, 

 but what I received was the AmpJiipholis "kinbergi. On my request, Professor The'el 

 was so good as to renew his search among such of Ljungman's species as are kept 

 at the Stockholm Museum, but he could not find Amphiura kinbergi, which, 

 according to what he wrote me, no longer exists in the museum. One may, 

 therefore, consider the type of this species as lost. On the other hand, 

 although the particulars given by Ljungman as regards the shape of the spines, 

 the absence of plates on the under face of the disk, the presence of two tentacular 

 scales, and the very close affinities with A. latispina allow to a certain extent some 

 deductions to be made, it is obvious that, for want of a complete description, an 

 actual comparison is now impossible, and one can not apply with certainty to an 



