362 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



of the disk recalls that which I have described in the two first species, 

 but the characters of the ventral surface, the upper and under arm 

 plates, and the number of the spines are entirely different. The differ- 

 ences which separate this species from '. undata are very much more 

 marked; in this species the radial shields are not larger than the 

 plates of the primary rosette, the upper arm plates and the mouth 

 shields have a different shape, the arm spines are four in number, etc. 



AMPHIOPHIURA IMPROBA (Koehler). 



Plate 84, figs. 4, 5. 



Ophioalypha improba KCEHLEB ('04), p. 48, pi. 8, figs. 4-6. 

 Amphiophiura improla MATSUMOTO ('15), p. 77. H. L. CLARK ('15), p. 

 314. MATSUMOTO ('17), p. 261. 



Localities. Albatross station 5630; south of Patiente Strait: 

 Doworra Island (N.) bearing N. 3 W., 8.34 kilometers (4.5 miles) 

 distant (lat. 56' 30" S., long. 128 05' 00" E.) ; 1,041 meters (569 

 fathoms) ; December 2, 1909 ; co. S., M. 



Three specimens (Cat. Nos. 41138, 41139, U.S.N.M.). 



Albatross station 5631; south of Patiente Strait; Doworra Island 

 (N.) bearing N. 58 E., 19.46 kilometers (10.5 miles) distant (lat. 

 57' 00" S., long. 127 56' 00" E.) ; 1,479 meters (809 fathoms) ; 

 December 2, 1909; gn. M. (in net). 



Four specimens (Cat. No. 41137, U.S.N.M.). 



Notes. These specimens are quite in agreement with the type 

 which was discovered by the Siboga among the Sunda Islands (lat. 

 5 S., long. 127 E.) at a depth of 1,595 meters (873 fathoms). 



AMPHIOPHIURA INSOLITA (Koehler). 



Plate 84, figs. 8, 9. 



Ophiofflypha insolita KCEHLEB ('04), p. 47, pi. 7, tigs. 4-6. H. L. CLARK 



('08), p. 295. 

 Amphiophiura insolita MATSUMOTO ('15), p. 77. H. L. CLARK ('15), p. 



315. MATSUMOTO ('17), p. 261. 



Localities. Albatross station 5268; Verde Island Passage and 

 Batangas Bay; Matocot Point bearing S. 50 E., 10.75 kilometers 

 (5.8 miles) distant (lat. 13 42' 00" N. 5 long. 120 57' 15" E.) ; 311 

 meters (170 fathoms) ; June 8, 1908; S., P. 



Two specimens (Cat. No. 41116, U.S.N.M.). 



Albatross station 5289; China Sea, in the vicinity of southern 

 Luzon; Matocot Point bearing S. 42 E., 9.26 kilometers (5 miles) 

 distant (lat. 13 41' 50" N., long. 120 58' 30" E.) ; 256 meters (140 

 fathoms) ; July 22, 1908; brk. Sh., S. 



Nine specimens (Cat. No. 41113, U.S.N.M.). 



Albatross station 5297; Matocot Point bearing S. 50 E., 9.45 kilo- 

 meters (5.1 miles) distant (lat. 13 41' 20" N., long. 120 58' 00" E.) ; 

 362 meters (198 fathoms) ; July 24, 1908; M., S. 



