MUSEUM OF COMPARATIVE ZOOLOGY. 5 
marked longitudinal series. The dorsal papille 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 papille 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 ambulacra. Scattered among these warts, 
the small papille 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. 
(?) Stichopus fuscus, Ludwig. 
The specimen seems to agree in all respects with the description of Ludwig, 
with the exception of the dorsal papilla, which have not been satisfactorily 
mentioned by Ludwig. In the specimen from San Diego all the papille 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. 
