188 lOKICULA^ 



LITUACEA. Lam. A family of tte order Polytlialamous Ce- 

 phalopoda, Lam. containing the genus Spirula, fig. 471. 

 LITTJITUS. Montf. Spieolina, Lam. Microscopic. 

 LITUOLA. Lam. A genus of microscopic Foraminifera. 

 LITUOLiE. Lam. The third family of Polythalamous Cepha- 

 lopoda, Lam. the shells of which are described as partially spiral, 

 , the last whorl continuing in a straight line. The transverse 

 septa which divide the chambers, are in general pierced by a 

 siphon which breaks itself ofi* before it reaches the succeeding 

 ; septum. This family contains the genera of microscopic Pora- 

 minifera Lituola and Spirolina. The genus Spirula, also placed 

 in this family, does not by any means agree with Lamarck's 

 definitions, "the last whorl continuing in a straight line." 

 LITUUS. Hump. Ctclostoma? Lam. 



LIYID. (From lividus.) Of a pale, duU, blue colour. The 

 adjective is sometimes used as a specific name. Ex. Conus 

 lividus, Sanguinolaria livida. 

 LOBAEIA. Schum. SANaTiiNOLAEiA rosea, Lam. (fig. 98) and 



other similar species. 

 LOBATE or LOBED. Divided into parts. 

 LOBATULA. Eleming. A genus composed of two very minute 

 species of chambered shells. Serpula lobata and S, concame- 

 rata, Mont. Test. Brit. 515. 

 LOMASTOMA. E-afinesque. An imperfectly defined genus, 



probably belonging to the Limnacea. 

 LONGrlTUDIlM'AL. Lengthwise. Longitudinal strise, ribs, &c. 

 are those which radiate from the apex and follow the spiral 

 direction of the whorls, in spiral shells ; and from the umbo to 

 the ventral margin in bivalves. The term " decourantes" is 

 employed by Erench conchologists. The bands in Achatina, fig. 

 286, are longitudinal or spiral. 

 LOPHXJERUS. Poli. Chiton squamosus, and similar species. 



The marginal insegment in regular scales. 

 LORICULA pulcheUa. Gc. B. Sowerby, Jun. Ann. Nat. Hist. 

 Vol. XII. 1843. p. 260. Darwin, Eossil lepad^, p. 84. A 

 very beautifully formed Cirripede, found in the lower chalk. 



