468 HELIX 8. 153. 454. 
striata; spira planata; sutura profunda; anfr. 5!/, —6, convexius- 
culi, regulariter acerescentes, ultimus ad peripheriam angulatus, 
infra angulum inflatus; umbilicus infundibuliformis; apertura 
obliqua, subreniformis; perist. incrassatum, breviter reflexum, 
sinuosum, marginibus callo valido triangulari junctis. — Diam. 
maj. 7!/,—8!/5;, min. 61/, —7!/,, alt. 3—3!/; mill.» (B.) 
Helia Febigeri Bland. in  Tryon Amer. journ. conch. II. 1866. 
p. 323.0921. £40: 
— — (Polygyra) Binn. $^ Bland Landsh. North-Am. 
L p. 4108. f. 184. 
Polygyra. Febigeri Trion in Amer. journ. conch. III. 1867. p. 160. 
t:,10.:1 30.33. 
Habitat prope New-Orleans (Major G. L. Febiger). 
Obs. «Differt a reliquis generis speciebus deficiente excavalione an- 
fractus pone labrum.» (Tr.) 
S. 454. 
3355. thyroidus Say. (Coll. 1433.) I. 345 ((hyroides Binn.) Il. 262. 
IV. 343. V. 416. — Mesodon Zinn. Amer. landsh. p. 147. f. 2514. 
— Pütel Cat. p. 95. — Mesodon thyroides Tryon in Amer. journ. 
conch. HI. p. 41. t. 8. f. 4. — Var. rufa Michener in Tryon 
Journ. II. p. 53. (Heliv rufa De Kay.) — America borealis. 
3356. devia Gould. (Coll. 4434.) I. 383. III. 262. IV. 313. V. 417. — 
Newc. in Amer. journ. conch. I. p. 347. — Mesodon Binn. Amer. 
landsh. p. 152. f. 259. — Helix Baskervillei Pfr. (MI. 230. IV. 313.) 
— AHesodon devia Tryon in Amer. journ. conch. lII. p. 42. t. 8. 
f. 3. — Vancouver's Island. 
* * 
* 
3351. plectostoma Bens. (Coll. 1435.) I. 415. III. 262. IV. 343. V. 417. 
— Polygyra Pütel Cat. p. 93. — Darjiling et Montes Khasia. 
3358. Pinacis Bens. J V. 417. — Sikkim regionis Himalayanae. 
3359. H. macromphalus W. Blanford. | 
«Testa sinistrorsa, late umbilicata, depressa, discoidea, te- 
nuiuscula, pallido-cornea, superne plicis arcuatis obliquis incre- 
menti et liris spiralibus decussata, ad peripheriam et subtus fere 
laevis, striatula: striis nonnullis spiralibus circa umbilicum ali- 
quando distinguendis. Spira plana; apice vix emergente; su- 
tura leviter impressa. Anfr. 4!/—5!/5 planulati, arcte voluti; 
ultimus vix latior, supra peripheriam subangulatus, ad latus 
atque subtus convexus, antice leviter descendens. Apertura 
irregulariter lunaris, superne compressa, diagonalis; peristoma 
albido-labiatum, parum incrassatum, reflexiusculum, marginibus 
convergentibus, callo tenui junctis, externo supra peripheriam 
arcuato. Plicatio interna persimilis ei Helicis Pinacis et H. plecto— 
