68 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



REOPHAX DENTALINIFORMIS H. B. Brady. 



Plate 12, fig. 4. 



Reophax dentaliniformis H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, 

 p. 49; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 293, pi. 30, figs. 21, 22.— 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 87, fig. 121 (in text). 



Specimens from this region are not quite typical, having as a rule 

 the chambers shorter and more rotund than in the type, but there is 

 some variation. Most of the stations are in more than 250 fathoms 

 (457 meters) and it is most frequent and best developed in material 

 from those stations which have the greater depth and the lower 

 temperatures. 



Hitherto the records for this species have been almost exclusively 

 from deep waters, but more than half of these noted here are less 

 than 500 fathoms (914 meters). 



The localities for this species include Chma Sea off Luzon ; between 

 Negros and Siquijor; Sibuko Bay, Borneo; Gulf of Tomini, Celebes; 

 north of Celebes; and off Bouro Island. 



Reophax dentaliniformis — Material examined. 



REOPHAX NODULOSUS H. B. Brady. 



Plate 12, fig. 5; plate 10, figs. 1, 2. 



Reophax nodulosus H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 52, pi. 4, 

 figa. 7, 8; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 294, pi. 31, figs. 1-9.— 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 87, fig. 122 (in text). 



This species iias occurred at several stations, usually in gi-eat num- 

 bers with sand, and showing the same range of variation as in the 

 figures given by Brady in the CTiallenger Report. The specimens 

 are large as a rule, and are m comparatively deep and cold water, as 

 might be expected from the conditions of its occurrence elsewhere. 



It is interesting to note, however, that at the shallowest station 

 of this lot, D5589, in 260 fathoms (480 meters), it was very abundant 

 and very variable, showing almost completely the various forms fig- 



