so. 1798. CRINOIDS COLLECTED BY THE ALBATROSS— CLARK. 551 



ing about as long as broad on the eleventh, and half again to twice 

 as broad as long distally; eighth and following with produced distal 

 dorsal edges which soon become prominent dorsal spines. 



Disk completely plated. 



Ends of the basal rays visible in the angles of the calyx as dorso- 

 ventrally elongate tubercles; radials short, about four times as 

 broad as long, with a prominent median tubercle; IBr^ decreasing 

 slightly in width distally, about twice as broad distally as long in the 

 median line; it bears a low broadly rounded median carination, 

 most prominent posteriorly; IBrg rhombic, half again as broad as 

 long, the proximal two-thirds of the median dorsal line raised into 

 a low broad tubercle; IIBr 4 (3+4). 



Thirteen arms 90 mm. long; after the proximal third the brachials 

 gradually develop produced and overlapping spinous distal edges, at 

 the same time becoming laterally compressed; after the proximal 

 half this production of the distal edge becomes very prominent, 

 especially in the median line. 



Type.—Cat. No. 27499, U.S.N.M., from station 5317. 



This species is nearest to C. sentifera; but the centrodorsal is pro- 

 portionately much smaller and bears closely crowded columns of 

 cirrus sockets without bare mid-radial areas, the edges of the elements 

 of the IBr series are smooth instead of finely dentate, the IBrj has 

 a distinct, though low, rounded median carination, and the distal 

 overlap of the brachials, though very prominent, is not produced 

 into the long overlapping spine characteristic of C. sentifera. 



The type of C. infelix, however, is a small specimen; larger speci- 

 mens may prove to approach C. sentifera, though it seems most 

 probable that the two forms are quite distinct. 



Genus THALASSOMETRA. 

 THALASSOMETRA ANNANDALEI (A. H. Clark). 



This species was originally described in the genus Crotalometra, but 

 I believe that it had better be referred to the genus TJialassometra, 

 in which it w^ould occupy a position near T. gigantea. 



Station 5116. — A small tlialassometrid with eleven arms 60 mm. 

 long from this station I originally referred to Crotalometra eupedata,"- 

 though with considerable hesitation. At that time the present 

 species was not known. Comparison with the specimens at hand 

 shows that it is without doubt an example of TJialassometra ann^n- 

 dalei. 



Station 5280. — One specimen with twenty-one arms 130 mm. 

 long and cirri 50 mm. to 60 mm. long; there are four IIBr 2 series; 

 two of these bear (externally) IIIBr 4 (3 + 4) series. 



oProc. U. S. Nat. Mus., vol. 36, 1909, p. 406. 



