CLARK: OPHIITROIDEA. 



437 



Station 4654. Peru: off Aguja Point, 24 miles. 1036 fms. Bott. 

 temp. 37.3°. Dk. br. m. 



Bathymetrical range, 725-1036 fms. Extremes of temperature, 

 38°-37.3°. 



Eight specimens. 



Amphhtra gymnogastra. j 



Liitken and Mortensen, 1899. Mem. M. C. Z., 23, p. 145, pi. 9, fig. 6-8. 



These Amphiuras are perplexing, for while they have the inter- 

 brachial spaces below perfectly naked as in ^. gymnogastra, there are 

 onl\- 3 or 4 arm-spines, and these are not small and sharply pointed 

 as they should be, but are long, thick, and blunt as in some specimens 

 •of A. serpentina. In fact these specimens are quite intermediate 

 between A. gymnogastra and A. serpentina. It is possible that they 

 are hybrids, but more probably the two species are not distinct, the 

 naked skin of the interbrachial areas in A. gymnogastra being a tempo- 

 rary condition due to peculiarities of breeding or possibly a stage of 

 extreme maturity-. The differences in the arm-spines of the two 

 nominal species is not constant, specimens of A. serpentina with 5 

 small, sharp arm-spines being known. 



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

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



Fi\e specimens. 



Amphiura seminuda. 

 Lutken and Mortensen, 1899. Mem. M. C. Z., 23, p. 148, pi. 11, fig. 1-3. 



These specimens, with disks about 5 mm. across, are in poor condi- 

 tion, but there is no question as to their identity. 



Stiation 3689. Paumotu Islands: 4 miles southwest of northwest 

 point of Marokau. 807 fms. Bott. temp. 37.6°. Co. s., mang. 



Two specimens. 



Amphipholis granulata. 

 Lutken and Mortensen, 1899. Mem. M. C. Z., 23, p. 155, pi. 10, fig. 1-4. 



Although this little specimen (disk-diameter 3 mm.) was taken by 

 the Albatross in 1891, it is from a station from which the species was 

 not previously recorded. 



