34 Mr. A. II. Clark on new Cnnoids 



apposition and are sharply flattened laterally ; the prox'mal 

 edge of the IBri is everted and slightly scalloped; tiie 

 anterior edges of the axillary are slightly everted, but 

 smooth ; the lateral third of these two ossicles taken to- 

 gether bear a dozen or a dozen and a half prominent well 

 rounded and entirely separated tubercles, some of which may 

 be laterally elongated ; the sides of the ossicles of the II Br 

 series are similarly, tliough not so extensively, modified, 

 this modification being bordered interiorly by a more or less 

 marked prominent beaded ridge or row of tubercles, which, 

 however, may be absent. 



The type specimen has about twenty-six arms, which are 

 75 mm. long. 



Type Locality. ' Siboga ' Station No. 51 ; southern portion 

 of Molo Strait; 69-91 metres. 



DicJiromeira tenuicirra, sp. n. 



In all the details of its general structure this species agrees 

 with D.flagellata, but it is sharply separated from that form 

 by the curious character of its cirri, which are long and 

 slender, with elongate, though spinous, distal segments. 



The centrodorsal is low hemispherical, with very sloping- 

 sides ; the dorsal pole is slightly convex, flat, or very 

 slightly concave, I'o mm. to 2 mm. in diameter; tlie cirrus 

 sockets are arranged in two or in two and a partial third 

 marginal rows. 



The cirri (in the type) are XXVIII, 25-28, 20 mm. to 

 25 mm. long, slender and delicate : the first segment is very 

 short, the second is twice as broad as long, the third is 

 sliglitly broader than long, the fourth is half again to twice 

 as long as the median diameter, and the fifth is from two to 

 two and one-half times as long as broad ; the following to 

 the ninth, tenth, or eleventh (the latter usually a faintly 

 marked transition segment) are similar, but those following 

 are slightly shorter, about half again as long as broad ; the 

 tenth, eleventh or twelfth, and following bear prominent 

 triangular median spines ; the earlier of these spines occur 

 about in the centre of the dorsal line of the segments; their 

 anterior (distal) margin stands out vertically and is from one- 

 third to one-half as long as the recumbent side ; tlie hypo- 

 thenuse fi'om the apex of the spine to the proximal base is 

 usually straight, but there may be a slight tubercle where it 

 merges with the dorsal surface of the segment ; sometimes 

 it is more or less concave, leading from the dorsal spine to a 

 smaller blunt proximal tubercle ; the spines change but 

 little distally ; their bases become shorter and their apices 



