316 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



distal intersyzygial interval is in four instances of 3, in eight of 4, in thirteen of 5, 

 hi seven of 6, hi six of 7, hi four of 8, in one of 9, and hi one of 10 muscular articulations. 

 The two proximal pinnule segments are relatively somewhat larger than in the other 

 specimens and more expanded laterally; the first are shorter and more oblong, and the 

 second are more distinctly trapezoidal. 



A small specimen from sta. 4621 has an arm length of 75 mm. The cirri have 36 

 segments. The third syzygy is usually between brachials 16+17, but once between 

 brachials 17 + 18, and the distal intersyzygial interval is 4 to 6 (usually 4) muscular 

 articulations. 



Localities. Albatross station 3385; north of the Pearl Islands, Bay of Panama 

 (lat. 732'36" N., long. 7916'00" W.); 523 meters; temperature 7.72 C.; green mud; 

 March 8, 1891 [Hartlaub, 1895; A. H. Clark, 1915]. Type locality. 



Albatross station 4630; off Mariato Point, Panama; Mariato Point bearing N. 70 

 E., 51 miles distant (lat, 655'00" N., long. 8142'30" W.); 1016 meters; temperature 

 4.72 C.; green sand; November 3, 1904 [A. H. Clark, 1908, 1915] (1, U.S.N.M., 36201). 



Albatross station 4622; off Mariato Point; Mariato Point bearing N. 52 E., 66 

 miles distant (lat. 631'00" N., long. 8144'00" W.); 1062 meters; green sand and 

 rocks; October 21, 1904 [A. H. Clark, 1908, 1915]. 



Albatross station 3357; southwest of Mariato Point (lat. 635'00" N., 8144'00" 

 W.); 1429 meters; temperature 3.61 C.; green sand; February 24, 1891 [Hartlaub, 

 1895; A. H. Clark, 1915]. 



Albatross station 4621; off Mariato Point; Mariato Point bearing N. 55 E., 63 

 miles distant (lat. 636'00" N., long. 8145'00" W.); 1062 meters; temperature 4.72 

 C.; green sand, mud and rocks; October 21, 1904 [A. H. Clark, 1908, 1915]. 



Albatross station 3424; off the Tres Marias Islands, Tepic Territory, Mexico (lat. 

 2115'00" N., long. 10623'00" W.); 1236 meters; temperature 3.33 C.; gray sand 

 and black specks; April 18, 1891 [Hartlaub, 1895; A. H. Clark, 1915]. 



Geographical range. From the Bay of Panama northward to the Tres Marias 

 Islands, Tepic Territory, Mexico. 



Bathymetrical range. From 523 to 1429 meters; the average depth of habitat is 

 1032 meters. 



Thermal range. From 3.33 C. to 7.72 C.; the average temperature of the 

 habitat is 4.8 C. 



History. This species was first mentioned by Mr. Alexander Agassiz (1891) in 

 a letter written to the U.S. Commissioner of Fisheries, Col. Marshall McDonald, 

 during the cruise of the Albatross off the west coast of Central America to the Gala- 

 pagos, to the west coast of Mexico, and in the Gulf of California. In this letter he 

 merely noted that comatulids had been secured off the Tres Marias Islands. In a 

 subsequent letter (1892) he remarked that among the comatulids dredged between 

 Central America and the Galapagos Islands yellow prevails, passing to a reddish tinge, 

 or even to brilliant red, as the principal color. It is probable that the reddish and 

 brilliant red individuals to which he referred were specimens of Psathyrometra bigradata, 

 which was taken at two localities, and that the yellow ones were F. tanneri and Fario- 

 melra parvula. 



In his account of the unstalked crinoids taken on this expedition Dr. Clemens 

 Hartlaub (1895) included two species referable to the genus Florometra, rhomboidea 

 P. H. Carpenter(now considered to be a synonym of F. magellanica) , and tanneri, sp. nov. 



