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THE VOYAGE OF H.M.S. CHALLENGER. 
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Scheme of the Genus LAGENA. 
(The marginal numbers correspond to those in the Distribution Table.) 
I. Typically, round in transverse section. 
Laguna globosa, Walker & Jacob, sp. Typically, subglobular, entoso- 
lenian, and smooth externally, . . .PI. LVI. figs 
apiculata, Reuss, sp. Apiculate or mucronate forms of the same, — 
longispina, Brady. Globular or somewhat compressed, with long 
basal spines, ...... — 
L. ovum, Ehrenberg, sp. Regularly elliptical, .... — 
L. ovata, Terquem, sp. Obovate or trowel-shaped ; broad and rounded 
at the apertural end, pointed at the base, 
L. botelliforviis, Brady. Cylindrical, or elongate ovate, bent, . 
figs 
figs 
fig. 
A. 
fig- 
Lagena lsevis, Montagu, sp. Flask-shaped ; with ectosolenian neck ; smooth 
externally, ...... 
L. clavata, d’Orbigny, sp. Similar, but tapering to a point at the base, 
L. gradllima, Seguenza, sp. Attenuated, fusiform, often curved, 
generally distomous, ..... 
L. elongata, Ehrenb., sp. Attenuated, cylindrical, often distomous, 
L. truncata, Brady. Truncate, and armed with a ring of peripheral 
' spines at the base, ..... 
figs 
B. 
— figs 
— fig- 
figs 
Lagena aspera, Reuss. Pyriform, surface decked with small, irregular, 
rounded or angular projections, . . .PI. LVII. figi 
rudis, Reuss. Surface rough with large and irregular projections, 
interspersed with dimples or depressions, . . C. 
L. ampulla-distoma, Ry. Jones. Subglobular, ecto-entosolenian ; with 
roughened or areolated surface, especially near the base, — fig. 
L. distoma-margaritifera, Parker & Jones. Attenuated, fusiform, 
studded with beads or interrupted costae ; distomous, PI. LVIII. fig. 
■Lagena hispida, Reuss. Surface aculeate or spinous, . . .PI. LVII. figs 
hystrix, Reuss. Surface beset with tube-like truncated spines 
of unequal length, ..... D. 
L. distoma-acideata, P. & J. Elongate, fusiform, beset with prickles ; 
distomous, ...... E. 
figs 
fig. 
Lagena striata, d’Orbigny, sp. Flask-shaped, surface ornamented with very 
numerous fine longitudinal striae, ... — 
lineata, Williamson, sp. Ovate, mucronate, finely striate, ento- 
solenian, ...... — 
L. distoma, P. & J. Elongate ; cylindrical or slightly fusiform ; with 
fine parallel striae ; distomous, . . .PI. LVIII. figs 
L. curvilineata, Balkwill & Wright. Surface ornamented with fine 
meandering striae, ..... F. 
i. 1-3. 
s. 15-18. 
i. 33-36, &e 
5. 
6 . 
;. 7-12, &c. 
i. 24-26, &c. 
29. 
s. 31, 32. 
3 . 7-12. 
5. 
16. 
;. 1-4. 
. 22, 24, &e. 
13. 
. 11-15. 
