40 THE APODOTJS HOLOTHURIANS 



wide, and perforated near the middle by several holes, among which there is 

 usually a single outwardly directed sharp spine. In the large specimen the 

 ellipses are reddish brown and are collected in patches, while the rods are 

 nearly straight, without a spine, and crowded at right angles to the axis of the 

 body. The third specimen has deposits intermediate between the other two. 

 Length of body, 63 mm. x 20 in diameter; tail broken; in another specimen the 

 body is 30 x 10 and the tail is an even 10 more. 



Three specimens from "Albatross" Station 3603, lat. 55 23' N. and 

 long. 170 31' W., 3,188 m. (Cat. No. 19860, IT. S. N. M.) 



This remarkable species is so easily recognized by its peculiar tentacles that 

 it cannot be confused with any other. 



HIMASTHLEPHORA, gen. nov. 

 (l/j.d(rO\ri, thong of a whip, + <#>opos, bearer; in reference to the remarkable dorsal appendages.) 



Tentacles 15, each with 4 digits, of which the terminal pair are the larger ; 

 without ampullae. Body nearly cylindrical, rather stout, terminating abruptly in 

 a long, slender, caudal portion. Mid-dorsal interambulacrum with 4-6 whiplash- 

 like papillae. Rudimentary pedicel-like outgrowths near both the anterior and 

 posterior ends of the body. Genital papillae prominent, 2 mm. or more in 

 length. Respiratory trees small and delicate. Longitudinal muscles simple, 

 flattened, and unpaired. Calcareous ring of 10 pieces, rather stout and syn- 

 apta-like, with no posterior prolongations. No calcareous or phosphatic de- 

 posits in the skin. Careful examination of two specimens failed to show a stone- 

 canal. 



The type species of this genus is the following: 



HIMASTHLEPHORA GLATTCA, sp. nov. 



(yAavKos, gray; in reference to the color.) 



PLATE XIII, FIGS. 1-4. 



Color light gray; tentacles and papillae brownish. Length, 28 mm., of 

 which nearly a third is tail ; body 8 mm. thick. Genital glands noticeable as tufts 

 of numerous, thick, unbranched tubes, one on each side of mesentery, 3-4 mm. 

 back of calcareous ring. The papillae in mid-dorsal interambulacrum are 4-6 

 in number and 5-6 mm. long. There appear to be 5 clusters of pedicel-like pro- 

 jections at the posterior end of the body, at the base of the caudal appendage, 

 and there are rudimentary pediceUike processes scattered about the anterior 

 end also. Calcareous particles in the skin are wanting, but were possibly dis- 

 solved by impure alcohol, as the specimens were collected in 1886. 



There are 4 specimens of this most remarkable and interesting holothu- 

 rian, which were dredged by the "Albatross," Station 2678, in 1,316 m. off the 



