2i62 iMi'- ^V. II. Benson on new Land Shells from 



young, when extricated from it, attach themselves to the body of 

 their parent. 



Like other species belonging to the same genus, Lycosa pal- 

 lida, in constructing its cocoon, slightly connects the margins of 

 the two compact portions, beneath which the thin fabric of the 

 zone is folded. This simple contrivance affords an admirable 

 provision for the development of the young in the foetal state by 

 an increase in the capacity of the cocoon consequent on the mar- 

 gins of the compact parts becoming detached by means of the 

 expansive force within, the eventual liberation of the young 

 being effected by the rupture of the zone, which is the weakest 

 part. This interesting fact in the oeconomy of the Lycosce appears 

 to have escaped the observation of arachnologists. 



XXIV. — Descriptions of new Land Shells from St. Helena, Ceylon, 

 and China. By W. H. Benson, Esq. 



1. Succinea imperialis, nobis, n. s. 



Testa ovata, tenui, nigoso- striata et remote plicata, striis spiralibus ob- 

 soletis et rugis nonnullis prope marginem anteriorem muuita, dia- 

 jihana, nitidula, sub epidermide rubra, epidennide strigis virente- 

 luteis et purpureo-fuscis alternautibus oruata ; spira brevissima, 

 apice prominulo, obtuse, sntura impressa ; anfractibus 2 convexis, 

 penultimo superne perconvexo, ultimo amplo, f longitudinis 

 Eequante ; columella arcuata ; apertura amplissima, ovali, vix ob- 

 liqua, intus aurantia, uitida ; peristomate simplici, acuto, basi 

 leviter emarginata, marginibus callo angulum superiorem aperturse 

 implente junctis, columellari filari, reflexiusculo, intrante. 



Long. 19, diam. 13 mill. ; long, apert. 15i lat. 11 mill. 



Hab. in insula St. Helenae. Lieut. Lefroy. 



I have ventured to describe this handsome shell as new, 

 although a Succinea {Helisiga St. Helena') has been described by 

 Lesson from the same place; but his short description* and the 

 measurement differ so much from the characters above given, 

 that, notwithstanding my not having seen his figure, I can 

 hardly err in considering my species as new. 



2. Succinea orientalis, nobis, n. s. 



Testa ovato-conica, tenui, striata, nitidula, sordide cornea, apice rutilo, 

 papillate, sutura distineta ; anfractibus 3i convexis, ultimo pone 

 columellam nuUo modo attenuato, f longitudinis secpiantc; columella 

 subcallosa ; apertura mediocri, ovab ; peristomate simplice, margini- 

 bus callo tenui junctis, columellari subverticali. 



Long. 10, diara. 6 mill. ; long, apert. 6, lat. 4. 



Hab. ad Macao, Imperii Sinensis. Cantor. 



* " Helisif/a St. Helena;. T. glabenima anipla ovata, unispirata, fiisco- 

 rubcUa, fragillima. Piam. 7, alt. 3 lin." — Lesson, Voy. Coquille, p. 3\(i, 

 as quoted by L. PfoifFcr. Monogr. vol.. ii. 



