72 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



CRISTELLARIA TRICARINELLA Reuss. 



Plate 34, figs. 1, 2. 



Cristellaria tricarinella Reuss, Sitz. Akad. Wiss. Wien, vol. 46, 1862, p 68, pi. 7, 

 fig. 9; pi. 12, figs. 2-4. — H. B. Beady, Rep. Voy. Challenger, Zoology, vol. 

 9, 1884, p. 540, pi. 68, figs. 3, 4. 



Description. — Test elongate, greatly compressed ; earliest chambers 

 close coiled, following ones soon becoming elongate, but extending 

 back to the previous coil, giving an elongate subtriangular form to 

 the later developed portion, sutures limbate; periphery of the test 

 with a flange-like keel at each side, the border between them concave 

 or with a median raised keel in addition to the lateral ones, wall 

 unornamented except for the limbate sutures and keeled periphery. 



Length 1.5-2 mm. 



Distribution. — Brady records this species in the North Pacific from 

 one Challenger station off the Philippines in 95 fathoms. The only 

 North Pacific stations from which I have had material are Albatross 

 D4840 in 154 fathoms, bottom temperature 39.9° F., and D4900 in 

 139 fathoms, bottom temperature 52.9° F., off Japan. This is the 

 same region from which so many southern species seem to reach 

 their northern limits, that it is not surprising to find this species 

 there, which is really from its distribution a species of tropical 

 waters. 



CRISTELLARIA TRICARINELLA Reuss, var. SPINIPES, new variety. 

 Plate 33, fig. 2. 



Description. — Like the typical but the early chambers of the close 

 coiled portion showing limbate sutures and the apical end of the 

 test bearing a large stout spine. 



Type-specimen. — Cat. No. 8546, U.S.N.M., from Albatross station 

 D4900 in 139 fathoms, bottom temperature 52.9° F., off Japan. 



CRISTELLARIA CALCAR (Llnnseus). 



Plate 32, fig. 4. 

 "Nautilus minimus non umbilicatus" Gaultieri, Index Test., 1742, pi. 19, 



fig.C. 

 "Nautili (Lenticulse radiatae)" Soldani, Testaceographia, vol. 1, pt. 1, 1789, p. 



54, pi. 33, figs, aa, bb. 

 Nautilus calcar Linnaeus, Syst. Nat., ed. 12, 1767, p. 1162, No. 272; (Gmelin'e) 



ed. 13, 1788, p. 3370, No. 2. 

 Robulina calcar d'Orbigny, Foram. Foss. Bass. Tert. Vienne, 1846, p. 99, pi. 4, 



figs. 18-20. 

 Cristellaria calcar Parker and Jones, Ann. Mag. Nat. Hist., ser. 2, vol. 19, 1857, 



p. 289, pi. 10, figs. 10-12. — Parker, Jones, and H. B. Brady, Ann. Mag. 



Nat. Hist., ser. 4, vol. 8, 1871, p. 242, pi. 10, fig. 91— H. B. Brady, Rep. 



Voy. Challenger, Zoology, vol. 9, 1884, p. 551, pi. 70, figs. 9-15— H. B. 



Brady, Parker, and Jones, Trans. Zool. Soc, vol. 12, 1888, p. 224, pi. 44, 



fig. 14.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 318, pi. 66, fig. 1.— 



Fornasini, Mem. Accad. Sci. 1st. Bologna, ser. 5, vol. 10, 1902, p. 46, fig. 



45.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 146. 

 Robulina aculeata d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 289, No. 14. 



