38 THE APODOUS HOI.OTHURIANS 



There are 4 specimens (Cat. No. 19825, U. S. N. M.), collected by the "Alba- 

 tross" (Station 2784) near the southern part of Wellington Island, Chile, lat. 

 48° 41' S., long. 74° 24' W., 349 m. 



Caxtdina obesacauda, sp. nov. 

 {ohesa, fat, + cauda, tail; in reference to the stout caudal appendage.) 



Plate IX, Figs. 1-5. . 



Tentacles 15, each with 4 sharply pointed digits. Calcareons ring stout, 

 the posterior prolongations of the radial pieces very prominent. Polian vessel 

 single, long. Stone-canal single, small. Filaments of the genital glands very 

 long and unbranched. Body stout, the tail not abruptly narrow. Calcareous 

 particles, cups closed with a cross, similar to those of C. coriacea, but the 

 knobs are not so prominent. The anal papilte are crowded with modified cups 

 and irregular perforated plates, and do not seem to have any such deposits as 

 those figured by Theel (and called "characteristic") from the anal papilhe of 

 coriacea. In the tail, however, the deposits are very much crowded, heavily 

 knobbed, and nearly spherical, and the holes are almost obliterated. Color, 

 pale brown. Length, 115 mm., of which the tail is about one-third ; diameter 

 of body at middle, 30 mm. ; of tail near base, 20 mm. ; near middle, 12 mm., and 

 near tip, 4 mm. 



There is a single specimen (Cat. No. 19823, U. S. N. M.) of this large and 

 notable species, bearing only the label "Marco, Florida." It is very obviously 

 different from arenata, the common Atlantic species, but it is closely related 

 to coriacea of the western Pacific. It differs from that form, however, in the 

 shape of the body and in the calcareous particles of the caudal portion. If the 

 label is correct, it is curious that this new species should find its closest ally 

 in a species of the western Pacific. There is a small Caudina from Galveston 

 Bay, Texas, which seems to be of this same species, but as it has at some time 

 been completely desiccated, it is past accurate determination. 



Caudina contkactacauda, sp. nov. 



{(oniracia, made abruptly smaller, -\- cauda, tail; in reference to the form of the caudal 



appendage.) 



Plate IX, Figs. 9-13. 



There is a single remarkable specimen of Caudina from the Aleutian 

 Islands, "Albatross" Station 3600, lat. 55° 06' N., long. 163° 28' W., taken in 

 16 meters of water (Cat. No. 19824, U. S. N. M.). It is 70 mm. long, of which 

 a little more than one-third is "tail," though the terminal portion is broken 

 off. The greatest diameter, 24 mm., is just before the body suddenly con- 

 tracts to form the caudal portion, which is 10 mm. in diameter at the base 

 and 5 near the tip. The color is very pale brown, the body wall thick and 



