Boo7ie, Echinodermata, Cruises of *'Ara" and "Alva" 191 



colouring is lost; in alcohol, the only colouring left is a creamy- 

 white ground colour maculated irregularly with steely grayish 

 splotches and with distinctive transverse bars of olivaceous brown 

 on the dorsad. 



Typical examples of the calcareous deposits are shown in figure 

 12. These are of four kinds: (a) Simple anchors, 0.5 millimeters 

 long and 0.3 millimeters wide, with smooth flukes distally tapered, 

 describing an arc equal to 0.6 of the length of the central shaft 

 which terminates distally in a short bar bearing six to eight small 

 spinules; (b) anchor plates, subcircular disks, about 0.30 to 

 0.27 millimeters long, with a narrowed prolongation supporting 

 the handle; the disk pierced by seven large, somewhat unequal, 

 subcircular or suboval holes, the seventh hole being dentate on 

 the proximal or basal margin, the distal portion being smooth, 

 elongated, narrowed distally, subovate and two moderately large 

 and three or four small, smooth holes in the handle. These two 

 large holes of the handle are symmetrically placed and are sepa- 

 rated by the narrow apex of the seventh hole of the disk. There 

 are normally three small, nearly equal holes in the handle. The 

 anchors and anchor plates are very numerous in the skin ; these 

 pairs being separated from one another by an average space of 

 one and five-tenths to twice the length of the anchor. The flukes 

 of the anchor are not infrequently bent oif their plane; (c) there 

 are also great quantities of miliary rosettes of subcircular out- 

 line with a small, subcircular hole in the center, to be found in 

 the skin. These rosettes are about 0.2 to 0.3 millimeters in diam- 

 eter. These rosettes are especially abundant in the tissue sur- 

 rounding the peristome and in the tentacles; (d) there are also 

 in the peristome and tentacles tissues numerous straight or slightly 

 curved rods, 0.01 to 0.03 millimeters long, with dilated ends, both 

 the lateral surface and apices being covered with asperities. 



The calcareous ring has five radial pieces, each with an ante- 

 rior perforation and the related posterior margin more shallowly 

 notched than are those of the moderately excavate interradials. 

 The Polian vesicles are of moderately unequal length. The madre- 

 poric body is elongated. 



References: Synapta godeffroyi, Semper, C. von, Reisen im 

 Archipel. der Philippinen, Wissensch. Res., 1868, Theil III, 

 Bd. I, Leipzig, p. 231, pi. 39, fig. 13. 



