102 THE LAND AND FRESH VATER MOLLU3CA OF DORSETSHIRE. 



2. T. MAUGEL, Ferussac. 



Resembles the abov species in many respects, the two principal 

 longitudinal grooves are similar, but the secondaries not being 

 oblique the interspaces are rhomboidal. The upper portion of the 

 body is more rugose, which is seen to advantage when the animal is 

 at rest and not extended, mottled-brown on a red or whitish 

 ground, individuals diffei materially in this respect; the -ventral 

 front is bright orange-colour and occupies quite half of the body. 

 The mottled spots, which extend over a large portion of it, give it 

 the appearance of a pattern. The tentacles are thin and slender, 

 not swollen at the extremity. The eyes occupy the some position 

 as those of the other species, but are less distinct. The colour of 

 the tentacles differs in individuals, dark in some, and nearly white 

 in others. L.2.5. B.0.4. 



Shell more convex than T. haliotidea, relatively longer and 

 nirrower; the spiral point and anterior margin are less conform- 

 able to the median line, and lie more obliquely. The concentric 

 striae of growtn differ in individuals of this species; in some cases 

 they are roughly raised, in others they are almost smooth ; the 

 interior is smooth and glossy. L.0.27. B.0.14. 



This species was first discovered in 1801, near Teneriffe, by M. 

 Maug6 ; about 40 years afterwards it was found at Bristol, since then 

 in other parts of Somersetshire, also at Plymouth, Cork, Swansea 

 and Jersey. 



It appears to be indigenous to Madeira, the Canary Islands, 

 Portugal, and the South-west of France. 



Rectory Gardens, Corfe Castle (Eustace Bankes). 



FAMILY in. HELICIDJS. 



The different species of this family are very numeroub ; it is 

 calculated that more than two thousand are distributed through- 

 out the world, aud found under every condition of climate, 

 from the summit of snowy mountains, to the scorched deserts of 

 tropical lands ; some prefer moist dank places, others dry, and 

 in full sun-glare. Pfeiffer described no less than 1149 species of 

 the typical genus Helix in 1848. 



Mr. Grwyn Jeffreys gives the following table, in which the 

 family may be divided : 



1. Succinea. Shell oval, usually not quite covered by the body. 



2. Vitrina. 3. Zonites. Shell globular or round, glossy, sometimes 

 covered in part by a lube or expansion of the mantle. 



4. Helix. Shell shaped like the last, bat not glossy, nor any part 

 of it covered by the mantle. 



