MUSEUM OF COMPARATIVE ZOOLOGY. 5 



marked longitudinal series. The dorsal papillae are scattered, and of two 

 kinds : partly situated on rather large conical warts, and partly running out 

 directly from the surface of the skin. The papillae situated on warts form 

 a simple row along each side of the body, about six in each row, and are 

 besides found scattered irregularly over the rest of the back, though they 

 appear to belong principally to the ambulacia. Scattered among these warts, 

 the small papillae are visible. A single Polian vesicle, 20 mm. long, is present. 

 A thin bundle of long, slender genital tubes is situated on each side of the 

 dorsal mesentery. 



The deposits consist of tables and buttons. The disks of the tables are 

 rather large, with a smooth or uneven margin, and are, as a rule, pierced with 

 numerous holes, which form several peripheric circles. The disks of the 

 ventral tables are smaller, and provided with fewer holes, which often form 

 only a simple peripheric circle. The spire is built up of four rods and one 

 transverse beam, and terminates in several teeth; usually some teeth are placed 

 also on the rods themselves and the transverse beam, so that a side view often 

 presents two crowns of teeth. The upper quadrangular opening of the spire 

 is often closed by a complete or incomplete cross. The buttons are smooth, 

 elongate, often asymmetrical or incomplete, and they are always pierced with 

 more than three pairs of holes; usually one side of the buttons is more devel- 

 oped than the other. 



Habitat. Five miles south of Santa Barbara (Cal.); depth 22 fathoms; a 

 single specimen. 



(^) Stichopus natans, Sars. 



Habitat. St. Kitts (1878-79); depth 208 fathoms; some very imperfect 

 specimens. 



C?) stichopus fuscus, Ludwlg. 



The specimen seems to agree in all respects with the description of Ludvvig, 

 with the exception of the dorsal papillae, which have not been satisfactorily 

 mentioned by Ludwig. In the specimen from San Diego all the papillae are 

 placed on low, wide warts, which are scattered over the dorsal ambulacra as 

 well as interambulacra, so that they do not present an arrangement in rows, 

 except along each side of the body, where they form a simple row. The 

 C-shaped deposits appear to be thinly distributed, and the tables are small and 

 terminate in 20 to 28 teeth; the margin of the disk of the tables is smooth, 

 and perforated with a complete or incomplete circle of peripheric holes. The 

 short spire is composed of four rods and one transverse beam. 



Habitat. San Diego, California (Hassler Exp.). One specimen, 170 mm. 

 long. 



