310 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



OPHIONEREIS DUBIA (Mttller and Troschel). 



See for bibliography: 



Ophionereis diiMa Loriol ('94), p. 19. — H. L. Claek ('01), p. 248. — Kgehleb 

 ('05b), p. 458; ('07), p. 315; ('07b), p. 246.— H. L. Clark ('15), p. 289. 



Locality. — Albatross station 5159; Sulu (Jolo) Archipelago; Tawi 

 Tawi Group; Tinakta Island (N.) bearing N. 82° W., 2.59 kilometers 

 (1.4 miles) distant (lat. 5° 11* 50" N., long. 119° 54' 00" E.) ; 18 

 meters (10 fathoms) ; February 21, 1908 ; co. S. 



One specimen (Cat. No. 41016, U.S.N.M.). 



Notes. — The diameter of the disk is 5.5 mm. The specimen agrees 

 well with the descriptions of authors and with Savigny's figures. 

 The genital slits are entirely smooth, and this feature does not permit 

 of referring the specimen to 0. porrecta, which is frequently met 

 within the Indo-Pacific region. 



OPHIONEREIS SEMONI (Doderlein). 



Plate 61, figs. 1, 2. 



Ophiotrlton semoni Doderlein ('97), p. 2SS, pi. 15, figs. 8, 8a. 

 Ophionereis semoni Kcehxer ('05), p. 54, pi. 6, figs. 7, 8; pi. 14, fig. 4. — H. 

 • L. Clark ('15). p. 290. 



Locality. — Albatross station 5249; Gulf of Davao; Lanang Point 

 bearing N., 1.85 kilometers (1 mile) distant (lat. 7° 06' 06" N., long. 

 125° 40' 08" E.) ; 42 meters (23 fathoms) ; May 10, 1908 ; Co., S. 



One specimen (Cat. No. 41012, U.S.N.M.). 



Notes. — The specimen is of small size, but it is very well character- 

 ized ; the diameter of the disk is 4 mm., and the arms are 25 mm. long. 

 The color of the disk is a light greenish yellow ; the arms show evenly 

 spaced narrow brown cross bands. 



I have thought it well to include two photographs of this specimen 

 with a greater enlargement than that which Doderlein used (pi. 61, 

 figs. 1,2). 



In 1905 I gave the reasons for which it seemed to me necessary to 

 retain O. semoni in the genus Ophionereis. 



Ophionereis semoni has been found in different localities in the 

 Sunda Islands at very variable depths down to 94 meters (52 fath- 

 oms). 



OPHIODORIS CONTRARIUS Koehler. 



Ophiodoris contrarius Kcehler ('04), p. 75, pi. 12, figs. 3, 4. — H. L. Clark 

 ('15), p. 290. 

 Locality. — Albatross station 5601a; Gulf of Tomini, Celebes; 

 Limbe Island (NE.) bearing N. 38.36 kilometers (20.7 miles) distant 

 (lat. 1° 13' 10" N., long. 125° 17' 05" E.) ; 1,399 meters (765 fath- 

 oms) ; November 13, 1909 ; S., Glob., Ptr. 

 One specimen (Cat. No. 41334, U.S.N.M.). 



