244 



BULLETIN lOO, UNITED STATES NATIONAL MUSEUM. 



CRISTELLARIA CASSIS (Fichtel and Moll). 



Plate 49, figs. 2a, b. 



"Cornii Hammonia" Plancus, Conch. Min., 1760, p. 120, pi. 1, fig. 11. 

 "Litui crispati et orbiculi" Soluani, Testaceographia, vol. 1, pt. 1, 1789, p. 63, 



pi. 56, figs. I, K, etc. 

 Nautilus cassis Fichtel and Moll, Test Micr., 1803, p. 95, pi. 17. 

 Cristellaria cassis Lamarck, Tabl. Encycl. et Method., 1816, pi. 467, figs. 3a-d. — 



H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 552, pi. 68, fig. 10. 



Description. — ^Test much compressed, ovate, early chambers regu- 

 larly coiled, later ones becoming elongate and showing a tendency 

 toward uncoiling; umbilical region with prominent bosses and single 

 bosses appear on the sutures near the peripheral edge; umbilical 

 region broadest in front view, wall otherwise smooth; sutures little 

 if at all depressed, of clear shell material; peripheral border with a 

 definite, very thin keel; aperture radiate, at the peripheral margin of 

 the chamber. 



Length up to 4 mm. or more. 



DistnhvMon. — This species occurred at a number of Albatross sta- 

 tions in the region from the following localities: Jolo Sea; off eastern 

 Palawan; several stations on the east coast of Luzon; Gulf of Tomini, 

 Celebes; Patiente Strait; off Bouro Island and Gulf of Boni. 



The depth of these stations ranges from 480 to 901 fathoms (887 

 to 1,648 meters), the average depth being 614 fathoms (1,123 meters). 

 The bottom temperatures where given average 44.7° F. (7.0° C). 



At some of the stations off the east coast of Luzon this species was 

 abundant, but at the others it was represented by but few specimens. 

 It has not previously been recorded from the North Pacific. 



Cristellaria cassts — Material examined. 



CRISTELLARIA CASSINOIDES Cushman. 



Plate 48, figs. 2 a, h. 

 Cristellaria cassinoides Cushman, Proc. U. S. Nat. Mus., vol. 51, 1917, p. 659, 



Description. — Test elongate, much compressed, arcuate, early 

 chambers coiled, later ones uncoiling and forming an elongate growth 



