HELIX.— Plate CXIII. 



stratiiiiiea, nifo iessellatd el atritjnld ; spird planiiis- 

 culd; anfnicllbtis tribiis ad ijuatuor, vix convexitisculU, 

 rapide accrescettUbus, ultimo depresso ; aperturd per- 

 obUqnd, ampld, suiocali ; perUlomale simplici, acuta, 

 marginiliUK appruximatis, callo tenumimo Juiic/i.i. 



The Helicoimianta-like Helix. Shell uinbilicatcd, 

 depressed, tliin, obliquely and closely rib-like striated, 

 straw-colour, streaked and tessellated with red ; spire 

 rather Hat ; whorls three to four, slightly convex, in- 

 creasing rapidly, the last depressed ; aj)crture very 

 oblique, large, lunar-oval ; lip simple, acute, with the 

 margins approximating, and joined by a very thin 

 callosity. 



Pfeiffeu, Pro. Zool. Soc. 1845. p. 125. 



riab. Juan Fernandez. 



Closely resembling the preceding species, from which it 

 differs in being uniformly smaller, and of more opakc sub- 

 stance. 



Species 651. (Mus. Cuming.) 



Helix tessellata. Hel. testd umbUkatd, dhcoided, 

 utrinqite pland, tenui, pallide corned, strigis anguslis 

 iwdatis ritfis pictd ; anfractibus sex ad septem, angm- 

 tissii/iis, ultimo suhtus subinjlato ; umbilico mediocri, 

 pernio; aperlurd lunato-rolundatd ; perisfomale sim- 

 plici. 



The tessellated Helix. Shell umbilicatcd, discoid, 

 flat on both sides, thin, pale horny, painted with 

 narrow waved red streaks ; whorls six to seven, very 

 narrow, the last slightly inflated beneath ; umbilicus 

 middling, open ; aperture lunar-rounded ; lip simple. 



Muulfeldt, Anton, Verz. p. 36. 



Ilab. Juan Fernandez. 



Another example of this interesting little type from 

 Juau Fernandez, of more discoid growth -than either of the 

 preceding species. 



Fig. 652. (Mus. Cuming.) 



The shell here figured proves to be a variety of //. Tur- 

 biniformis, PI. XXXVII. Sp. 167. 



Species 653. (Mus. Cuming.) 

 Helix arctispira. Hel. testa umbilicatd, depressd, sub- 

 discoided, con/ertim costatd, alLidd, epidermide Icnui 

 fuscescente indutd ; spird convexiusculd ; aafractibus 

 quiuque ad sex, convexis, angusti-nimis ; umbilico lata, 

 perspeclivo ; aperturd parvuld, subcerlicali, luiiato- 

 subcirculari ; peristomate simplici, acuta. 

 The arciied-simre Helix. Shell umbilicatcd, depressed, 

 subdiscoid, closely-ribbed, whitish, covered with a 



thin light brown epidermis ; spire rather convex ; 

 whorls five to six, convex, very narrow ; umbilicus 

 broad, perspective ; aperture rather small, subvcr- 

 tical, lunar-subcircular ; lip simple, sharp. 



Pfeiffer, Pro. Zool. Soc. 1846. p. 41. 



llab. Juan Fernandez. 



Closely allied to //. tessellata, but of smaller and still 

 more compressed growth, with a larger umbilicus. 



Species 654. (Mus. Cuming.) 



Helix Oparica. Hel. testd subumbilicatd, orhiculato- 

 convexiusculd, tenui, coslnhito-striatd, fuscescente, ob- 

 solete rubro-nmculatd ; spird depressd; atifractibus 

 quatuor ad quinque, angustis, cauvexiiisculis ; aperturd 

 late lunari ; peristomate acuta, usque ad umbilicum 

 producto ; dentibus tribus lamelliformibus in pariete 

 aperlurali, quatuor in nmrgine basali. 



The Opara Helix. Shell slightly umbilicatcd, orbicu- 

 larly convex, thin, rib-like striated, brownish, obso- 

 letely red-spotted ; spire depressed ; whorls four to 

 five, narrow, rather convex ; aperture broadly lunar ; 

 lip sharp, produced as far as the umbilicus ; three 

 lainelliform teeth in the wall of the aperture, four on 

 the basal margin. 



AxTox, Yerz. p. 39. 



Had. Island of Opara, Pacific Ocean ; Cuming. 



An interesting minute species, with the same typical 

 characteristics as H. contorta and sexlwnellata. 



Species 655. (Mus. Cuming.) 



Helix hystrix. Hel. testd umbilicatd, depressd, subdit- 

 cokted, regulariter coslulatd, corneo-luted, pilis rectis 

 rigidis deciituis hirsutd, superne rufo tessellata ; spird 

 pland, media subimmersd ; anfractibus quinque, con- 

 vexis, ultima descendente, basi lineis elevatis, inttrdum 

 obsoletioribus decussato ; umbilico lata, perspectiro ,- 

 aperturd lunalo-subcirculari ; peristomate simplici, 

 acuta. 



The porcupine Helix. Shell umbilicatcd, depressed, 

 nearly discoid, regularly finely ribbed, horny-yellow, 

 covered with erect rigid hairs, tessellated about the 

 upper part with red ; spire flat, slightly inuncrscd in 

 the middle ; whorls five, convex, the hist descending, 

 decussated at the base with raised lines, which arc 

 sometimes obsolete; umbilicus broad, perspective; 

 aperture lunar-subcircular ; lip simple, sharp. 



MioilKLs, I'feilfer, Symbcila", vol. iii. p. 07. 



Hub. Wahoo, Sandwich Islands. 



Tessellated in a conspicuous manner with dark ri'd, and 

 curiously bristled over with rigid hairs. 



