THE OPHIURID^. 



171 



) 



they become much broader (Figm-e 2 gives them scarcely broad enough). 

 The dorsal plates have, according to Lymajst, a blunt angle within; in our 

 specimens they have the inner angle truncated in about the inner half 

 of the arnij being rather broadly in contact. The grains oE the disk are 

 rounded, according to Lymak (not figured separately) ; in our specimens they 



r 



are a httle pointed, ending in a few small spines (Fig. 4). These grains are 

 found along the outer edge of the dorsal plates far out on the arm, some- 

 times almost to the end. Lyman says that only the first three or four are 

 provided with grains; his figure, however, shows them on the first six plates 



(all that are figured). 



The two upper arm-spines are, according to Lyman, as long as a joint 

 and a half, but his figures are far better in accordance with our specimens, 

 where the upper one is as long as three arm-joints, the next much shorter ; 

 farther out also* the upper one is somewhat shorter. The tentacle scale is 



pointed, a little curved. 



There are thus not a few differences to be noted between our specimens 

 and Lyman's, judging from his figures and description. However, all these 

 differences are rather unimportant, and may partly depend on a slight in- 

 accuracy by Lyman. In any case they seem to us too insufficient for 

 founding a new species upon. 



0. JVormam \Yixs taken by the ^'Challenger" in the Eastern Pacific; it has 



thus a very wide distribution. 



Lyman orio-inally placed this species in the genus Ophiacantha ; later he 

 transferred it to OpUomitm. We cannot agree with him in this, and have 

 replaced it in the genus OjMacaniJia. ^Moreover, we find Ophiomiira a very 

 ill defined genus, which can scarcely be upheld, at any rate in its present 

 state. However we shall not at present say more about it, as we lack suffi- 

 cient material of such forms. 



> 



49. Ophiacantha moniliformis n. sp 



riate XVI. Figs. 5-8. 



Diameter of disk, 5 mm. ; width of arm close to disk, without spines, 

 1 mm. ; length of arms c. 6 times the diameter of the disk. Three-four 

 conical mouth papilla) on each siJe" of the mouth angle; that on the apex 

 much larger. Mouth shield almost cruciform, with all angles rounded, a 



and outer sides concave. Sometimes 



little broader than long ; 



inner 



fr. 





