LEPTOSPIRA. 181 



contains all the Cirripedes or Multivalyes, the different kinds of 

 which are not distinguished in the accounts given by early- 

 writers of the habits of the animals. (Fig. 14 to 43.) It was 

 formerly applied to the Limpets or Patella. In fact, the ancient 

 definition was " Concha petrae adhserens," and would apply to 

 any shells attached to rocks. Mr. Darwin, however, in his work 

 on the Lepadse, has very properly restricted the term " Lepas" 

 to the genus described in this work as Pentelasmis. PL ii. 

 fig. 34. 

 LEPT^NA. Dalman. A genus belonging to the Brachiopoda ; 

 and thus described : — " Hinge compressed, rectilinear, frequently 

 exceeding the width of the shell." It forms part of the genus 

 Producta, Sow. Pig. 206, L. depressa. 

 LEPTOCHITON. Gray. Chiton Cinereus, Chiton Cajetanus, 

 . and similar species, 



LEPTOCONCHUS. EiippeU. (AeTrroe, leptus, thin; Koyxoc, 

 conchos, shell.) This shell resembles a young Magiltjs in 

 general appearance, although the animal is said to differ. In the 

 young Magilus also, the inner lip is reflected over the body whorl, 

 which is not the case in Leptoeonchus, Bed Sea. PI. i. fig. 11. 

 LEPTOCONTJS. Swainson. A sub-genus of Conus, consisting 

 of Conus grandis, amadis, duplicatus, AustraHs, &c. Sw. p. 312. 

 LEPTOLIMNEA. Swainson, A sub-genus of Limnea, described 

 as being nearly cylindrical. Limnea elongata, Sow, Gen. fig. 6. 

 LEPTOlSr. Turton, 1822. Solen Squamosus, Montague, and 

 . other species described as " flat, nearly orbicular, equivalve, in- 

 equilateral, a little open at the sides- Hinge of one valve with 

 a single tooth, and a transverse linear lateral one on each side ; 

 of the other valve, with a cavity in the middle and transverse 

 deeply cloven lateral tooth on each side, the segments of which 

 divaricate from the beak;" See Kelladijb, L. squamosum. PI. 

 iii. fig. 62. 

 LEPTOSPIRA. Swainson. A sub-genus of BuHnus, thus de- 

 scribed : " Spire excessively long, sub-cylindrical ; body whorl 

 largest; outer lip thickened; apertiu-e oval; no teeth, striata, 

 Sw. Chem. 153. f. 1226. signata Sw." Sw. p. 335. 



