GLOSSARY. 



195 



INSTABILIS, in-staybil-iss, unsteady, 

 inconstant. 



INTERMEDIA, inter-meedy-ah, in- 

 termediate, lying between two 

 extremes. 



INTERSECTED, inter-sekt-ed, di- 

 vided, cut across; lines which 

 cross each other are said to inter' 

 sect one another. 



INVERTEBRATE, in-verty-brate, 

 having no backbone. 



INVOLUTA, in-vo-lute-ah, enfolded. 



INVOLUTE, invo-lute ; INVOLUTED, 

 invo-lute-ed, rolled inwards. 



IRIDESCENT, irry-dess-ent, coloured 

 like a rainbow. 



LABIOSA, lay-be-o-sah, having a 

 large lip. 



LACUSTRIS, lak-uss-triss ; LACUS- 

 TRE, lak-uss-tre, living in lakes. 



L/EVIS, lee-viss, smooth. 



LAMELLATA, lammel-ate-ah, fur- 

 nished with small plates. 



LAMELLATED, lammel-ate-ed, pro- 

 vided with plate-like layers. 

 (Lat. lamella, a small leaf, or a 

 plate of metal.) 



LAMELLIBRANCHIATE, lam-elly- 

 branky-ate, belonging to the 

 Lamellibranchiata, an Order of 

 bivalve molluscs which have 

 leaf -like gills. 



LAMINATA, lammy-nate-ah, having 

 plates or folds. 



LAMINJE, lammy-nee, thin plates 

 or layers. 



LAM i N ATED, lammin-ate-ed, having 

 plates or layers. 



LANCEOLATE, lance-o-late, like the 

 head of a lance. 



LAPICIDA, lappy-side-ah, a stone- 

 cutter, a lapidary. 



LARVA, larve-ah, the grub or cater- 

 pillar of insects ; plural, larvae, 

 lar-vee. 



LATERAL, latter-al, belonging to 

 the side; in bivalve shells the 



lateral (or side) teeth are those 

 which are placed at a greater or 

 less distance from the umbones, 

 towards the sides. 



LATIOR, layshy-or, broader. 



LEACHII, Leachy-i, named after 

 Dr. Leach. 



LIGAMENT, ligga-ment, the horny 

 and elastic ridge by which the 

 two parts of bivalve shells are 

 united ; it is placed behind the 

 umbones, and is either external 

 or internal. 



LIMAX, li-max, slug. 



LIMACID^E, li-mace-id-ee, a family 

 of land molluscs. 



LIMN^EA, lim-nee-ah, living in 

 marshes. 



LIMN^EID^E, lim-nee-id-ee, a family 

 of univalve molluscs. 



LINEAR, linn-e-ar, like a line, con- 

 sisting of lines. 



LINEATUS, li-ne-ate-us ; LINEATA, 

 li-ne-ate-ah, marked with lines. 



LINES OF GROWTH, the lines (stria} 

 formed by the edges of the suc- 

 cessive layers of shelly matter 

 deposited by the animal from 

 time to time as it constructs its 

 shell. 



LINGUAL RIBBON, ling-gwal rib- 

 bon, the tongue-like organ with 

 which the mouth of Gasteropo- 

 dous molluscs is provided; it is 

 armed with teeth, which vary in 

 number, shape, and arrangement 

 in the different genera and species, 

 and serves for the attrition or 

 mastication of food. 



LIPS. When a univalve shell is 

 held with the apex upwards and 

 the mouth facing the observer, 

 that portion of the margin on the 

 right side, which takes its rise on 

 the penultimate whorl, and is 

 continued downwards and round 

 till it reaches the base of the axis 

 or pillar of the shell, is called the 

 outer lip ; the inner lip (or colu- 

 mellar /#), when present, is con- 



