HA WAITAN HOLOTHURIANS— FISHER. 735 



(Lesson), but differs in havino- numerous scattered curved or straight 

 rods with swollen notched tips, in addition to the minute smooth rods 

 in muscle bands. T. purjnirea has, moreover, sigmoid deposits in the 

 external porisome besides the scattered aggregations of wheels. It is 

 found at the Falkland Islands. C.pisa/u'i, from the Chonos Archi- 

 pelago, coast of Chile, 45° south latitude, also resembles uniserialis^ 

 having C-shaped deposits in the tentacles and one row of wheel papillas 

 in each of the three dorsal interambulacra. Phanil is nearev pu7'27urea 

 than is unifierialls. 



Genus TyENIOGYRUS Semper. 



T;viilogi/rus Sempeu, lloluthuiien, 1868, ji. 2o. Type, t'hirodola austraiiana 

 Stimpson. 



Tentacles 10 to 12. Deposits, S-shaped rods, and sometimes wheels 

 with six spokes, grouped in papilla\ 



Semper's genus Txniogyrns^ founded on Stimpson's Chlrodota ((u-s- 

 tnth'ana, a fairl}" close relative of Ludwig's contoiia^ is quite distinct 

 from either Cldrldota or Troclwdota. 



TiENIOGYRUS, species. 

 Plate LXXXII, Hk- -'• 



From Station 3919, south coast of Oahu Island, 257 to 220 fathoms, 

 gray sand, there is a fragment of a T;eni<Kjyrus evidently closely 

 related to T. contorta (Ludwig). Tentacles 12; digits probably about 

 11 or 12, but tentacles are too contracted to ascertain accurately. 

 Wheel papilhi3 are present, but the integument is too much injured to 

 ascertain arrangement. Polian vesicles 10, of unequal size; madre- 

 poric canal single. Deposits, wheels, in groups, and very numerous 

 sigmoid rods (Plate LXXXll, lig. 2). The wheels resemble those figured 

 by Theel,^ and have a diameter of 0.09 to 0.175 nmi,, while the sigmoid 

 particles are slightly different, as may be seen b}^ comparing figures. 

 The latter are 0.185 to 0.23 mm. long, being thus smaller than in 

 contorta. 



The color of the specimen is whitish in alcohol, and the length is 

 about 60 mm. The specimen is apparently nearl}^ whole, but has 

 been twisted and rubbed over sand till it resembles a dirty piece of 

 cord. About the only differences which can be determined are in the 

 number of Polian vesicles and size and shape of the sigmoid deposits. 

 The species is evidently close to contorta. 



« Challenger Holotliurioidea, Pt. 2, pi. n, lig. 2a. 

 Proc. N. M. vol. xxxii— 07 47 



