146 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
Genus CRISTELLARIA. 
CRISTELLARIA ARTICULATA Reuss. 
Cristellaria articulata REruss, Sitzungsb. Akad. Wiss. Wien, XLVIII, 
USER, (O. BB, fol W, wie, O2 
This species was described by Reuss in 1870 under the genus C7vis- 
tellaria, although he had previously placed it under the genus Robu- 
lina, 2 name now in disuse. The shell is stoutly built, thicker and 
with more angular margin than Crestellaria rotulata. ‘There 1s also 
a smaller number of segments in typical specimens. 
“Wine examples of Cristellaria articulata occur in the dredged 
sands from off Culebra Island, 390 fathoms, and off Nightingale 
Island, Tristan da Cunha, 100 to 150 fathoms. In the latter locality 
the species is very abundant, and what is more remarkable the species 
assume wild-growing forms, such as are represented by figs. 1-4, pl. 
Lxrx.”@ found by the writer in the New Jersey Cretaceous and vari- 
ously recorded in Tertiary deposits. Cvistellaria are not abundant in 
any of the material we have here studied, but there are as many spe-— 
cles represented as there are occurrences. We find this species typi- 
cally developed at Station H. 4696. . 
CRISTELLARIA CALCAR (Linneus). 
Nautilus calcar LINNAUS, Syst. Nat., 12th ed., No. 272, p. 1162; 1788, Syst. 
Nat., 18th (Gmelin’s) ed., No. 2, p. 3370. 
As now used the species designated as Cristellaria calcar comprises 
those smooth-shelled involute nautiloid types with a spmous periph- 
ery. The spinous and flange-like border is exceedingly variable. 
Of cosmopolitan distribution at moderate depths. Geologically re- 
corded in the Tertiary. Present at Station D. 4000. 
CRISTELLARIA CREPIDULA (Fichtel and Moll). 
Nautilus crepidula FicHTEL and Moun, Test. Microsc., 1803, p. 107, pl. xix, 
figs. g-i. 
The above may well serve as the type of complanate elongate-oval 
Cristellariw with segments at first involute and later drawn out and 
separated by straight septa. The periphery is not carinate, although 
thin and round. A shallow water form and more frequent in temper- 
ate than in tropical seas. It has a long geological history and has 
been described by the author from the Cretaceous marl of Vincen- 
town, New Jersey. It is the most common species of the genus in the 
19 bottles of Albatross dredgings. Occurs at Stations D. 4000, 
H. 4430, H. 4508, and H. 4694. | 
@ Brady, Chal. Rept., IX, p. 547. 
