166 HYDROCENA §. 5. 6. 



41. plleosa Pfp. (Coll. 348. — Omphalotropis Pfr. 

 in Proc. 1S54. p. 308. — Ad. Gen. p. -300. — Cy- 

 clost. p/icosum Pfr in Proc. Zool. Soc. 1852. p. 

 61. — Cliemn. ed. nov. p. 361. t. 46. f. 41. 42. — 

 Omphalotropi.s plicosa Pfr. Pneum. n. 13. — lic- 

 alia p/icosa Gray Phan. p. 222.) Mon. p. 311. 



42. H. acutilirata Pfr. 



T. aperte perfortita , tuvbinata, tenuis , liris acutis niagis 

 minusve confertis, nonnullis interdum carinaeformibus , cincta, 

 cornea; spira conica, apice acuta; anfr. 5^2 convexiusculi, 

 ultimus basi inflatus; apertura obliqua, angulato-subovalis ; 

 perist. simplex, subrectum, marginibus callo tenui junctis, 

 sinistro subangulato. — Operc. corneum, paucispirum. — Long. 

 10, diam. Gi/^ mill. Ap. 52/3 mill. longa , medio 4^/3 l'^ta. 

 (Coll. Nr. 349.) 



Hydroccna acvtiUrata Pfr. in Proc. Zool. Soc. 1855. p. 106. 



— mu/tdinrata -Pfr- 11 et .-f. Adams Gen. rec. Moll. II. p. 300? 



Habitat .,Lord Ho\ve's Island'' Novarum Hebridarum (Mac- 

 gillivray). 



43. II. Annatonensis Pfr. 



T. perforata, globoso-conica, tenuis, carinis pluribus peri- 

 phericis, acutis, lirisque compressis, confertis, vix elevatis mu- 

 nita, parum nitida, iusca ; spira acute conica , sursum palles- 

 cens ; anfr. 6 convexiusculi , ultimus ventrosus; apertura vix 

 obliqua. irregularitcr ovalis ; perist. tenue, album , marginibus 

 approximatis , dextro brevissime expanso, columellari superne 

 recedente, cum parte inferiore subangulatim juncto , angustis- 

 simo. — Operc? — Diam. maj, 8, min. 62/3, alt. b mill. 

 Ap. 5 mill. longa, ^'/^ lata. (Mus. Cuming.) 



Cyclostoma Annatoncnsc (Cyclostomus?) Pfr. in Proc. Zool. Soc. 1855. 

 p. 105. 



Habitat in insula Annaton s. Aneiteum Novarum Hebridarum 

 (Macgillivray). 



Obs. Speciei praecedenti proxime afrmis videtur. 



44. If. Testita Pfr. 



T. perforata, oblongo-conica, tenuis, striata et spiraliter 

 conferte lirata, epidermide fuscula vestita; spira pyramidata, 

 acutiuscula ; anfr. 6 plani, ultimus carina acuta infra medium, 

 secunda circa perforationem nonnullisque minoribus basalibus 



