84 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



paratively deep water, between 700 and 900 fathoms (1,280 and 

 1,646 meters). At three stations specimens were found in 298, 312, 

 and 476 fathoms (545, 571, and 871 meters). These are the only- 

 four stations less than 700 fathoms. The bottom temperatures were 

 given in but four cases— 38.2°, 38.3°, 41.1°, and 49.3° F. (3.4° C, 

 3.5° C, 5° C, and 9.6° C). This last was from a station with a 

 depth of but 312 fathoms (571 meters). 



The localities represented are: Sibuko Bay, Borneo; north of Cele- 

 bes ; between Gillolo and Maky an Islands ; off Bouro Island ; Gulf of 

 Boni; and Flores Sea. 



Cribrostomoides bradyi — Material examined. 



Genus CYCLAMMINA H. B. Brady, 1876. 



CYCLAMMINA CANCELLATA H. B. Brady. 



Plate 16, figs, la, 6. 



"Nautiloid Lituola" W. B. Carpenter, The Microscope, ed. 5, 1875, p. 536, figs. 



274a-c (in text). 

 Cydammina cancellata H. B. Brady (MS.) in Norman, Proc. Roy. Soc. London, 



vol. 25, 1876, p. 214; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 351, pi. 37, 



figs. 8-16.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 110, figs. 168- 



170 (in text) (not fig. 171). 



Description. — Test nautiloid, typically biconvex, but occasionally 

 slightly more convex on one side than the other; chambers numerous, 

 averaging about 13 chambers in the last-formed coil, ranging from 

 12 to 15; usually three full coils in the adult test; peripheral edge 

 of test broadly rounded, approximately semicircular; sutures dis- 

 tinct but only slightly depressed, chambers little if at all inflated, 

 curved anteriorly in a nearly even curve in side view; wall smooth 

 and polished when perfect, when eroded, showing the perforate, 

 cancellate appearance due to the exposure of the labyrinthic inte- 

 terior; aperture an elongate, curved slit at the base of the aper- 

 tural face, supplemented by a clustered series of rounded pores 

 occupying the central part of the apertural face, often becoming 

 very numerous in large specimens; color reddish- or yellowish-brown, 

 some of the individual chambers occasionally black. 



