Subexcavated. A little excavated. 

 Subfusiform. Moderately fusiform. 

 Subglobose. Moderately globose. 

 Subglobular. Moderately globular. 

 Subhyaline. Moderately glassy. 

 Subimperforate. Not much perforated. 

 Suboblong. Moderately oblong. 

 Subobsolete. Almost disappearing. 

 Subovate. Nearly ovate. 

 Subparallel. Almost parallel. 

 Subperforated. Almost perforated. 

 Subquadrate. Almost four-sided. 

 Subreflectecl. Moderately turned back. 

 Subrotund. Moderately round. 



V 



Subspiral. Moderately spiral. 



Subtriangulate. Moderately or almost triangular. 



Subtrigonal. Moderately three-angled. 



Subtruncate. Moderately cut off. 



Subumbilicated. Moderately umbilicated. 



Sulcated. Grooved. 



Sulcus. A longitudinal furrow. 



Superanal. Above the anus. 



Supra-peripheral. Above the periphery. 



Symmetrical. Alike on both sides or uniform in all parts. 



Symphyuote. Having the posterio-dorsal portion of the shell flattened and 



produced, as in Symphynota complanata. 

 Terrestrial. Living on the land. 

 Testaceous. Composed of shelly matter. 

 Torsion. A twisting around. 

 Tortuous. Twisted or winding. 



Torpid. Half unconscious or asleep, as a snail during hibernation. 

 Translucent. Not quite transparent ; light is seen through the thin edges of the 



object. 



Transparent. Objects may be seen through the substance. 

 Transverse. Referring to the form of a shell when it is wider than high. 

 Tricuspidate. Having three cusps. 

 Trifid. Having three branches. 

 Trigonal. Having three angles. 

 Trilobate. Having three lobes. 



Tripartite. Divided into three parts, as the foot of some snails. 

 Truncate. Having the end cut off squarely, as some Unios. 

 Tuberculate. Covered with tubercles or rounded knobs. 

 Tumid. Swollen. 

 Turbiuate. Having the form of a top. 



162 



