52 BULLETIN 84, UNITED STATES NATIONAL MUSEUM. 



Oonnections and differences. — A. rathbuni belongs to the group of AmpJiiura 

 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 cylinckical; the mouth sliields, 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 Rathbun. 



AMPHIURA KINBERGIENSIS, new species. 



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



fAmpMura kinbergi Ljungman (71), p. 643. 

 Amphiura pnlmm Kcehler (07a), p. 279. 



FisJi Eawlc station 7512. Mar. 25, 1903. 3| mUes southeast by east of Fowey 

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



Type.— Cat. No. 32292, U.S.N.M. 



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

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

 the southern region of Brazil, T\dthout mentioning any depth. Unfortunately, 

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

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

 among the AmpTiiurx 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. Icinhenji: "Spinae brachiales ad iniimam proxima recta, in apice truncata, 

 aculeolis rmnutissimis lateralibus mstructa (quasi securiformis)," the two sentences 

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

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



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

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

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

 asked Professor Theel to lend me Amphiura Icinbergi of the Stockholm Museum, 

 but what I received was the AmpTiiphoUs Hnhergi. On my request. Professor Theel 

 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 Icinbergi, 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 



