328 BULLETIN 100, UNITED STATES NATIONAL, MUSEUM. 



the second segment, and this scale remains single throughout the 

 whole length of the arms, save for very rare and quite isolated ex- 

 ceptions. The upper arm plates resemble those of the two pre- 

 ceding individuals; the dorsal spine is a little shorter but more 

 swollen. 



The two photographs reproduced in figures 2 and 7 show the 

 variations of the mouth shields. Figure 2 shows the ventral sur- 

 face of the specimen given in figure 1; the shields are here appre- 

 ciably more elongated than in the individual shown in figure 7, 

 which comes from Mauritius, in which they are shorter; they are 

 also a little shortened in the specimen from Batavia (fig. 5). 



The under arm plates have the distal border slightly broadened 

 and usually notched in the middle. This character is also rather 

 variable; the notching is well marked in the individual shown in 

 figure 7, but it is less marked in that shown in figure 3, and especially 

 in those shown in figures 2 and 5. 



In all the specimens the ventral surface is covered with granules 

 over a more or less extended area; the triangular granulose area 

 thus formed extends toward the mouth shields and always leaves 

 free a more or less broad band along the genital slits. This character 

 is absolutely constant. I find the least development of the granulose 

 areas in the specimen shown in figure 3. 



OPHIOCOMA WENDTII Miiller and TroscUel. 



Plate 75, figs. 7, 8. 



See for bibliography : 



Ophiocoma wendtii Kgshler ('05), p. 63, pi. 14, figs. 5-7; ('07), p. 327, pi. 13, 

 fig. 38; ('07b), p. 246— H. L. Clark ('08), p. 297; ('11), p. 294. 



Localities. — Little Santa Cruz Island, Zamboango, Mindanao; 

 May 26, 1908. 



One small specimen (Cat. No. 40948, U.S.N.M.). 



Samoa. 



Five specimens. 



Notes. — I shall add some supplementary observations to the ac- 

 count which I have already given of this interesting species, which I 

 described and figured in 1905 and 1907. The specimens from Samoa 

 show characters so distinct that I do not hesitate to give here two 

 photographs of one of them in which the diameter of the disk is 

 12 mm. (figs. 7, 8). 



The large dorsal spines are much developed and follow each other on 

 every second or third segment. The tentacle scales are two in number 

 on the two first segments, except on one of the pores of the second 

 segment, where there is only a single one ; the two pores of the third 

 segment of one of the arms both show two tentacle scales. Every- 



