PLESIOZONUS. 145 



and meeting only at tip; they are .25-.50 mm. long. Of course more or less 

 intermediate forms occur connecting these varieties with each other and even 

 with the rostrate. Calcareous rods in the pedicels are few and scattered. The 

 sphaeridia are elongated and not at all spherical. 



Palaeopneustes fragilis. 



De Meijere, 1902. Tijcl. Ned. Dierk. Vereen, (2), 8, p. 12. 



This species was taken by the Siboga in the Dutch East Indies in 402- 

 566 fms. It was subsequently taken by the Albatross off the eastern coast 

 of Japan. All of the specimens were large and badly broken. The one 

 most nearly whole is about 125 mm. long. These specimens answer well to 

 de Meijere's full description and figures in his Siboga Echini and there can be 

 little doubt of the identification. 



Station 4969. Between Kobe and Yohohama, Japan. Bott. temp. 38.9\ 

 587 fms. Br. m., s., st. 



Station 4970. Between Kobe and Yokohama, Japan. Bott. temp. 39.1°. 

 500-649 fms. Br. m., bk. s., sh. 



Station 5053. Suruga Gulf, Japan. Bott. temp. 34.9°. 503 fms. Gn. m. 



Station 5080. Off Omai Saki Light, Japan. Bott. temp. 38.7°. 505 fms. 

 Fne. gy. s., glob. 



Bathymetrical range, 500-649 fms. Extremes of temperature, 39.1°- 

 34.9°. 



Four specimens. 



Palaeopneustes spectabilis. 



De Meijere, 1902. Tijd. Ned. Dierk. Vereen, (2), 8, p. 11. 



This species is also one of the Siboga's prizes. It was taken at three sta- 

 tions in the Dutch East Indies in 250-289 fms. 



Plesiozonus. 



De Meijere, 1902. Tijd. Ned. Dierk. Vereen, (2), 8, p. 12. 

 Type, Plesiozonus hirsutus de Meijere, 1902. hoc. cit. 



This is another monotypic genus based on a single specimen taken in 289 

 fms. near the Paternoster Islands, D. E. I., by the Siboga. The genus is remark- 

 ably well characterized by the unusual ambulacra. 



