90 GASTEROPODA. HELICIDZ. 
Genus 38. ABIDA. 
Chondrus, 2. Cuvier. 
Abida, C. Prideaux MSS. 
Testa cylindrica, acuminato-turrita ; ad apicem obtusiuscula. 
Apertura ovata, posticé truncata. Peritrema margimatum, 
reflexum, posticé inchoatum. Umbilicus perforatus. Tenta- 
cula superiora mediocria: inferiora brevia. 
Shell cylindric, acuminately-turrited; its apex somewhat 
obtuse. Aperture ovate, truncate behind. Peritreme mar- 
gined, reflexed, commenced behind. Umbilicus perforate. 
Upper tentacula moderate. 
Although there are several European species belonging to 
this genus, one only is found in Britain. 
ABIDA SECALE. 
A. testa anfractibus convexiusculis, obliqué striatis, apertura 
7, 8—plicata. 
Pupa Secale, Drap. Hist. des Moll. 64. pl. 3. figs. 49, 50. 
Turbo juniperi, Mont. Test. Brit. 340. t. 12. fig. 12; M. & 
R. Trans. Linn. Soc. viii. 182; Dill. Desc. Cat. 877 ; Turt. 
Conch. Dict. 221. 
Odostomia juniperi, fem. Edinb. Encycl. vii. 76. 
Chondrus Secale, Cuv. Rég. Anim. i. 408. 
Animal nigricans ; tentacula superiora interné subtus albida. 
Variat lateribus lutescentibus aut fuscis. 
Habitat in cretaceis sub muscis et lapidibus. 
Shell, with its whorls rather convex, and obliquely striated 
transversely. Aperture with seven or eight lamelle. Height 
five-sixteenths of an inch. 
Colour pale brown, sometimes inclining to fuscous. Peri- 
treme and teeth white or whitish ; the former sometimes tinted 
with pale flesh-colour. The dorsal aspect of the extremity of 
the last whorl above the peritreme is whitish, marked with three 
white lines, which correspond to the three anterior folds of the 
shell, which are in fact seen through the shell at this point. 
Abida Secale is by no means uncommon in chalky and oolite 
