CLARK: OPHIUROIDEA. 435 



Station 4(>47. West of Peru, 4° 33' S., 87° 42' 30" W., 2005 fms. 

 Bott. temp. 35°4. Lt. gy. and br. glob. oz. 

 Two specimens. 



Amphilepididae. 

 xVmphiactis duplicata. 



Amphiura duplicata Lyman, 1875. Illus. cat. M. C Z., no. 8, pt. 2, p. 19, 



fig. 87; pi. 5, fig. Vs. 

 Ophiactis duplicata Liitken and Mortensen, 1899. Mem. M. C. Z., 23, p. 142. 

 Amphiactis duplicata Matsumoto, 1915. Proc. Acad. nat. sci. Philadelphia, 



67, p. 67. 



r 



This series is not noteworthy. The range in size is from 3.5 to 

 5.5 mm. across the disk. 



Station 3407. Galapagos Islands: 4' S., 90° 24' 30" W., 885 fms. 

 Bott. temp. 37.2°. Glob. oz. 



Station 4641. Galapagos Islands: Hood Island, 12 miles south- 

 east of Ripple Point. 633 fms. Bott. temp. 39.5. Lt. gy. glob. oz. 



Station 4642. Galapagos Islands: Hood Island, 4 miles southeast 

 of Ripple Point. 300 fms. Bott. temp. 48.6°. Brk. sh., glob. 



Bathymetrical range, 300-885 fms. Extremes of temperature, 

 48.6°-37.2°. 



Twelve specimens. 



Amphilepis patens. 



LjTnan, 1879. Bull. AI. C. Z., 6, p. 34. 1882. ChaUenger Oph., pi. 19, fig. 



1-3. 

 Aynphilepis platytata H. L. Clark, 1911. Bull. 75 U. S. N. M., p. 171, fig. 76. 



This series shows that the differences which were supposed to 

 distinguish A. platytata from A. patens (absence of tentacle-scales 

 and of disk-scaling on the lower surface) are probably growth-stages, 

 or at any rate a matter of individual diversity. In two specimens, 

 with disk-diameter 6.5-8 mm., there are no tentacle-scales and the 

 interbrachial areas below are perfectly naked; they are thus like the 

 type of A. platytata which was 8 mm. across the disk. The other 

 specimens are 10-12.5 mm. across the disk and the interbrachial 

 areas below are fully covered with scales. 



There is no doubt of the identity of the specimen labeled 3389, 

 but it is possible that there is some mistake about the station number. 



