132 ELPIDIIDAE. 



there can be little doubt, but I believe Perrier's genus synonymous with Sars's. 

 Whether there is more than one species in the genus is not yet satisfactorily 

 determined for the diversity of form even in specimens from the same spot is 

 very great, and it is yet to be shown how much of this is natural and how much 

 is artificial, i. e. the result of contraction during preservation. The specimen 

 in the present collection is 13 mm. long and 10 mm. high; the anal tube is 2-3 

 mm. long but the oral end is strongly contracted and no tentacles are visible. 



Station 4631. Panama: off Mariato Point, 72 miles. 774 fms. Bott. temp. 38°. Gn. s. 



One specimen. 



Pelagothuriidae . 



Pelagothuria natatrix. 

 Ludwig, 1893. Bull. M. C. Z., 24, p. 111. 



This remarkable pelagic holothurian must be quite common in the eastern 

 tropical Pacific for it is well represented in both of the Albatross collections. 

 But all of the specimens are in poor condition and offer nothing additional to 

 Ludwig's very full description. They are all of about the same size, appar- 

 ently adult. The following list of stations is interesting as throwing much 

 light on the distribution. 



Station 16. 1 Eastern Tropical Pacific (660 miles northeast of the Marquesas), 2° 38' N., 137° 22' W. 



2,440 fms. 



Station 17. Eastern Tropical Pacific, 0° 50' N., 137° 54' W., 2,463 fms. 



Station 4641. Galapagos: Hood Island, 12 miles southeast of Ripple Point, 633 fms. 



Station 4645. Galapagos: south of Chatham Island, 1,955 fms. 



Station 4646. Eastern Tropical Pacific, 4° 1' 36" S., 89° 16' 18" W., 2,058 fms. 



Station 4715. Galapagos: southwest of Hood Island; tow at 300 fms. 



Station 4716. Galapagos: 55 miles southwest of Hood Island; surface tow. 



Station 4717. Eastern Tropical Pacific, 5° 10' S., 98° 56' W.; tow at 300 fms. 



Station 4721. Eastern Tropical Pacific, 8° 7' 30" S., 104° 10' 30" W. ; tow at 300 fms. and up to surface. 



Station 4742. Eastern Tropical Pacific, 0° 3' 24" N., 117° 15' 48" W.; tow at 300 fms. 



Thirty-three specimens. 



Elpidiidae. 



Parelpidia anamesa, 2 sp. nov. 

 Plate 3, fig. 3. 



Length 85 mm.; diameter, 15 mm. Color, light yellow-brown. Body-wall 

 very thin and soft. Tentacles ten. The specimen is in such poor condition 

 and so filled with mud, none of the details of the internal organization could 



1 Bottom temperature and character of bottom omitted, since the species is pelagic. 



2 avaiitoos = intermediate, in reference to the fact that the species seems to connect Parelpidia 

 and Peniagone. 



