FROM THE LAGOON AT FUNAFUTT. 179 
Cornuspira wnvoluens, Reuss, 1863, Sitzungsh. Akad. Wiss. Wien 
vol. xlviii. p. 39, pl. i. fig. 2. 
C. mvolvens, Reuss, Flint, 1899, Rep. U.S. Nat. Mus., Rep. for 1897, 
p. 303, pl. 48. fig. 3. 
The above species is represented here by some rather dwarfed 
or immature examples. 
Lagoon, Funafuti. Sample 17 (12 fathoms) ; sample 18 
(73 fathoms). 
PENEROPLIS, Montfort [1808]. 
PENEROPLIS PERTUSUS (Forskdl). 
Nautilus pertusus, Forskal, 1775, Descr. Anim. p. 125, no. 65. 
Peneroplis pertusus (Forskal), Mobius, 1880, Foram. yon Mauritius, 
p. 78, pl. iii. figs. 9-12, 
P. pertusus (Forskal), Flint, 1899, Rep. U.S. Nat. Mus., Rep. for 1897; 
p- 304, pl. 48. fig. 4. 
The forms of Peneroplis, usually regarded as varieties of a 
single species, are clearly related, but possibly do not show a 
more complete series of passage-forms than many other so-called 
species of Foraminifera. The specimens found at Funafuti fall 
into three groups-—namely, the nautiloid form with dendritine 
apertures, the compressed nautiloid and prolengthened form, and 
the delicate crosier-shaped type (subgenus Monalysidium). The 
first-named is by far the commonest form found at Funafuti. 
Lagoon, Funafuti. Sample 1 (10 fathoms); sample 17 
(12 fathoms) ; sample 18 (73 fathoms). 
PENEROPLIS ARIETINUS (Batsch). 
Nautilus (Lituus) arietinus (pars), Batsch, 1791, Conch. See-sandes, 
p- 4, pl. vi. fig. 15, e. 
Peneroplis arietinus, Parker, Jones & Brady, 1865, Ann. & Mag. Nat. 
Hist. ser. 3, vol. xvi. p. 26, pl. i. fig. 18. 
P. pertusus (Forsk.), type c, Brady, 1884, Rep. Chall. vol. ix. p. 204, 
pl. xiii. figs. 18, 19, 22. 
The rectilinear portion of the series in our specimens some- 
times shows a tendency to curve either inward or outward. 
This type is evolved from an emaciated P. pertusus by the 
unrolling of the last coil or so of chambers. 
Lagoon, Funafuti. Sample 17 (12 fathoms); sample 18 
(74 fathoms). 
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