t' 



tup: OPiiiURiDiE 



177 



54. Ophiacantha Bairdi Lj 



m 



Plate XVIII. Figs. 9-13 



Lyman: (70), p. 256, Plate V. Eigs. 70-72. 



From Station 3431, 995 f., there is one specimen, which we refer to this 

 species ; it is fairly in accordance with Lyman's description and figures. 

 His figures are, however, not very elaborate ; it is therefore necessary to 

 give new figures of the species. A detailed description is not neededj but 



some few remarks may be made. 



The number of the mouth papilla) is five or six on each side of the mouth 

 an Me. The form of mouth and side mouth shields may be seen on the 

 ficrure ; the latter are'not at all seen in Lyman's figure. The two or three 

 first ventral plates are in mutual contact, and have thus the inner angle 

 truncated; those beyond have an obtuse angle within; they are a httle 

 broader than long. The arms have a rather curious aspect, all the plates 

 being deeply striated by curved ridges (Fig. 11); also in other Ophiurans 

 this feature may be seen, but so distinctly as here we have never seen it. 



The disk is closely covered above with short, thick spines (or elongated 

 grains, Lymak), among which some few longer are spread ; on the ventral 

 side of the disk the spines are not so close set, the scaling being not 

 completely hidden. The longer spines are found only on the dorsal side. 

 Also on the mouth angle some spines are seen. Their form is seen in 

 Fi^mre 13, a, I, the lontr ones are about 0.5 mm., the small ones scarcely half 

 as lono-. The inner joints have seven arm-spines, farther out there are only 

 five, and they are here scarcely as long as one arm-joint. 



This species is thus found both in the Atlantic and the Pacific Oceans. 



% 



55, Ophiomitra* granifera n. sp 



Plate XIX. Figs. 9-ia. 



Diameter of disk, 11 mm.; width of arm close to disk, without spines, 

 2.5 mm. ; length of arms ahout six times the diameter of the disk. Three 

 more or less conical mouth papillce on each side of mouth angle ; the outer 

 one usually the largest ; that on the apex sometimes smaller, sometimes 

 laro-er than the rest. Mouth shield with an obtuse angle within, outer edge 



* About this geuus, we refer to wliat lias been said under OpJdacantha Normani. 



