CRINOIDEA AND ECHINOIDEA 



11 



segments and resemble very closely the one shown in Hart- 

 laub's photograph (pi. XII. fig. 3). The two arms remaining 

 are 75-80 mm. long and their ornamentation is very similar to 

 that shov/n in Hartlaiib's figure. There were 18 arms, with 

 syzygies between brachials 1 and 2 and again between 3 and 4, 

 as described by Hartlaub. The pinnules also agree well with his 

 description. The color is uniformly white. "While there seems 

 little reason to doubt, therefore, that this specimen is identical 

 wdth Hartlaub 's, v/hat its relation is to the other species of 

 Crinometra remains to be determined. 

 Station 2. Cuba: off Havana about 2% miles, 110 fms. 



Crinometra omata 



Antedon drevipinna var. omata Hartlaub, 1912. Mem. M. C. Z., 27, p. 348; 

 pis. IV, fig. 6; XII, fig 4. 



The specimen and fragments of this Crinometra do not cor- 

 respond in detail with Hartlaub 's description and figures, but 

 it is better to refer them to the same name than introduce a 

 new name into this already badly confused group. 



The individual before me has the centrodorsal so thickly cov- 

 ered ^^'ith cirri that it is difficult to determine its size and shape. 

 At the dorsal pole are a few high, compressed, irregular gran- 

 ules and ridges. The cirri are about 20 in number, with 17-20 

 segments, of which the penultimate bears a conspicuous oppos- 

 ing spine, while the 3-6 preceding have a similar but increasing- 

 ly ill-defined dorsal projection near the distal margin ; the dis- 

 tal margins, particularly of the basal segments, are flaring so that 

 they form a conspicuous socket for the next succeeding segment ; 

 all the segments are longer than wide, except the basal three, 

 and the fifth (or sixth) is the longest. There are 23 arms, of 

 which two are very small ; the longest exceed 100 mm. In their 

 ornamentation, the arms are more like Hartlaub 's fig. 9, pi. V, 

 than they are like the figures he gives for omata, but I am not 

 at all clear as to how much weight slight differences of ornamen- 

 tation properly carry in Crinometra. The pinnules of the speci- 

 men in hand are remarkable for the very great width of some of 

 the basal segments. Thus Ps is 6mm. long, and consists of 10 

 segments of which the third is .75-. 80 mm. high and a trifle 



