180 ECHINODERMA OF THE INDIAN MuSEUM, TART VII. 



The ventral view of the radial pentagon (the specimen has no disk) shows a 

 very broad and shallow central cavity with a small central plug ; the radial faces 

 are broad laterally but very narrow dorsoventrally, just as in Neomttra multi- 

 color. 



Radials moderate in length, resembling those of Neometra multicolur, except 

 that they are not produced interradially. The dorsal surface of the radials is 

 marked by a series of semicircular pits or gouges which serve to accomodate the 

 dorsal part of the cirrus bases. The cirrus sockets are all partly on the centro- 

 dorsal and partly on the radials; the central canal, however, is always on the 

 centrodorsal , though it may be only very slightly below its rim. The elements of 

 the IBr series are united by an exceedingly close synarthry which appears like a 

 syzygy in external view ; IBr, oblong, two and one half to three times as broad 

 as long ; IBr.-, broadly pentagonal, twice as broad as long ; the elements of the 

 IBr series are broad, in close lateral apposition, and slightly flattened laterallv, 

 just as in Ptilometra mulleri\ as in that species also the ossicles are veiy thin 

 dorsoventrally. The IBrj has a sharp tubercle in the middle near the proximal 

 border, and another smaller one in the middle of its anterior margin ; the IBr, 

 has a tubercle in the middle of each of the two anterior edges. The IIBr, and 

 the first brachial have each a median tubercle on their anterior border : the IIBr. 

 has two tubercles on its anterior border. The axillaries and preceding segments 

 of the IIBr series resemble the corresponding ossicles of the IBr series. The IIBr 

 series are 4 (3-|-4). 



Seventeen arms {in the type) 60 mm. long, the brachials in general resemb- 

 ling those of Pectinometra versicolor ; as in that species there is rather a sharp 

 overlap, especially at the distolateral angles ; the arms do not become laterally 

 flattened or carinate distally. 



Sacculi are abundant. The side and covering plates are highly developed. 



Pi about 7 mm. long, small and weak, flexible, rather strongly prismatic, 

 with eighteen segments ; it is at first moderately stout but tapers rapidly after 

 the basal third, being exceedingly slender and flagellate in the outer half; the 

 component segments are broader than long proximally, becoming .slightly longer 

 than broad distally ; the first segment is about twice as broad as the second, though 

 in comparison with the other species of the family it does not strike one as being 

 especially enlarged; the second segment is also enlarged, but very slightly; it 

 bears a small dorsal carinate process as does also the third, which is not enlarged 

 P^ stiff and spinelike, 8 mm. long with ten segments, the first short, the second 

 squarish, the remainder much elongated with slightly spinous distal ends. P 

 and P^ equal, slightly longer than P, Init similar to it, with twelve segments. 

 The first segment of P.^ and sometimes also of P, has a slight rounded dorsal 

 carination but is not otherwise modified. P^ about as long as P.^ but more 

 slender distally and less sjjinous. The following pinnules are slightly shorter 

 than Pj with eleven segments which have slightly prominent distal ends. All 

 of the pinnules are strongly prismatic. The distal ^linnules are 9 mm. long. 



