60 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
N. radicula Lin. 
Naut. radicula Lin., 1758, Syst. Nature, ed. X. p. 711. 
Nod. radicula v’ORB., 1826, Tab. Méth., An. Sc. Nat., VII. p. 252, Mod. 1 (N. solute 
Rewss proxima). 
Nod. radicula Gots, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 4, p. 10, 
Pl. I. Figs. 1, ? 2. 
Nod. radicula Br., 1884, Chall. Rep., IX. p. 495, Pl. LXI. Figs. 28-31 (glandulini- 
Sormis). 
Owing to its great variability in its ovoid-cylindric shape, in its either slender 
or stout growth, in the degree of constriction of the sutures, and in the relative 
length of the segments, it will be nearly impossible to trace a distinct boundary 
line between N. radicula and N. laevigata on one side, and N. soluta Reuss 
on the other. Such forms as Gland. rotundata Bornem., Gland. mutabilis 
(partially) Reuss are intermediate forms between WN. radicula and levigata ; 
and N. radicula D’ORB. (Mod. 1), with deep sutural constrictions and globular 
segments, is not distinguishable from N. soluta and N. Geinitzi Reuss, which 
can with difficulty be distinguished from N. glabra D'Or. In his valuable 
paper on Nodosarie Terziarie del Piemonte, 1894, Bull. Soc. Geol. Ital., XII. 
(1893), fase. 4, Rev. E. Dervieux has pointed out five varieties of this species. 
Naut. radicula Montaau, Test. Brit., 1803, was by English rhizopodologists 
once suspected to represent a Clavulina, but in Chall. Rep., 1X., Brady has 
identified it with N. radicula, About fifty different denominations have been 
bestowed on this form by authors. 
Pacific. 1201 fathoms ; rare ; slender form. 
Caribbean Sea. 120 fathoms; rare ; stout. 
N. comata Barscu. 
Nautilus comatus Batscu, 1791, Conchyl. Seesandes, Pl. I. Fig. 2, a-d. 
Nod. ( Glandulina) glans D’ORB., 1826, Tab. Méth., An. Sc. Nat., VII. p. 252, No. 2, 
Mod. 51. 
@ Nod. radicula var. Raphanus Gos, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. 
Hdl., XIX. 4, Pl. I. Figs. 9, 10 (extenuated form). 
Nod. comata Br., 1884, Chall. Rep., LX. p. 509, Pl. LXIV. Fig. 1-5 (stout forms). 
This handsome species has not been met with by the ‘ Albatross,’ but it 
occurs sparingly in the Caribbean Sea at moderate depths. Small and exten- 
uated samples merge into N. scalaris Batscu, 
Caribbean Sea. 300-400 fathoms (Goés). 
ALLIED Form:— 
N. scalaris Bartscu. 
Nautilus scalaris Batscu, 1791, Conchyl. Seesandes, Pl. II. Fig. 4. 
Nod. radicula yar. scalaris Gots, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. 
Hdl., XIX. 4, p. 21, Pl. I. Fig. 8. 
i! 
; 
| 
ee 
