90 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



AMMOBACULITES TE^fDIMARGO (H. B. Brady). 



Haplophragmium tenuimargo H. B. Brady, Proc. Roy. Soc. Edinbiirgh, vol. 11, 

 1882, p. 715; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 303, pi. 33, figs. 

 13-16. 



Ammobaculites tenuimargo Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 

 117, figs. 180-183 (in text). 



Four specimens of this species of rather smaller size than may be 

 typical, but otherwise of the form and character of the specimens 

 shown in the figures by Brady, occurred at D5420, between Cebu 

 and Bohol Islands, 127 fathoms (233 meters); bottom temperature, 

 59° F. (15° C). 



Ammobaculites tenuimargo — Material examined. 



AMMOBACULITES CALCAREUM (H. B. Brady). 



Plate 17, fig. 3. 



Haplophragmium calcareum H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 

 9, 1884, p. 302, pi. 33, figs. 5-12. 



As might be expected from the records given in the Challenger Re- 

 port, which were all but one from shallow water of the tropics, this 

 species is common in the material from this region. It has occurred 

 at a large number of stations and usually in considerable numbers. 

 Specimens exceed in size those obtained by Brady, some of them 

 measuring over 4 mm. in length. Apparently both microspheric 

 and megalospheric forms of the species occur. The material of the 

 test varies according to bottom conditions. It is always of fairly 

 coarse material, but smoothly cemented, the proportion of colored 

 cement being unusually large, as noted by Brady. 



Most of the stations are in the Philippines proper, but a few are 

 in the more southern region, in the Gulf of Boni, etc. In depth the 

 stations range from 50 to 565 fathoms (91 to 1,074 meters), but three 

 stations being less than 200 fathoms (366 meters), and few over 400 

 (732 meters). The range of depth compares rather well with that 

 given from Challenger stations, at which this species occurred. Bot- 

 ton temperatures range from 40.1° to 55.4° F. (3.5° C. to 15.2° C), 

 and at the shallowest station, 50 fathoms (91 meters), the bottom 

 temperature was 76.3° F. (24.6° C). 



