MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSCA. 21 
Testacella maugei [érussac. 
1801 Testacella Aaliotoides Lam., Sys. An. s. Ver., p. 86 (women nudum). 
1805 — haliotidea pars, Drap., Hist. Nat. Moll. France, pl. 8, ff. 46-48. 
1819 — maugei Fer., Hist. Moll. , p- 94, pl. 8, ff. 10-12 ; Reeve, Brit. Moll., 1863, 
p. 32 and ff. ; Adams, Coll. Manual, 1896, p. 41, pl. Pais Ge 
1827 — asininum de Serres, Ann. Se. Nat., p. 409. 
1850 — Jlartetii Dupuy, J. de Conch., i., pp. 302-4, pl. 15, ff. 2 a—d. 
1851 — bruntoniana de Serres, Mem. Terr. Transp., p. dl. 
1855 — hatliotidea vy. scutuliwm Moq.-Tand., Hist. Moll. France, pl. 5, ff 20, 21. 
1855 — burdigalensis, Gassies, Grateloup’s Dist. eoees Epes p- 15 
1855 = — oceunica Grateloup, Dist. Geog. Limaciens, p. 
1855 — aquitanica Grateloup, Dist. Geog. Limaciens. ce 16. 
1855 — browniana Grateloup, Dist. Geog. Limaciens, p. 16. 
1855 -— OBE E eae a Dist. Geog. “Limaciens, p. 16. 
1855 — monspessulana Grateloup, Dist. Geog. Limaciens, p. 16. 
1855 = —- canariensis Grateloup, Dist. Geog. Limaciens, p. 16. 
1855 — alte-ripe Grateloup, Dist. Geog. Limaciens, p. 16. 
1855 — deshayesii Michaud, Desc. Coq. Foss., p. 3, pl. 2, ff. 10, 11. 
1881 nouleti Bourg. , Hist. Mal. Colline de Sansan, p. 15, 
1819 Pleetrophor Us orbignyi Fér., t. Simroth, Nacktselnecken Portug.-Azorischen, 
1891, p. 404, 
History.—Testacella mauged was discovered at ‘leneriffe in 1796 by 
M. Maugé, in whose honour it was named by Férussac, and according to 
Dr. urton, was said to have been first found in England by Mrs. Smith, 
in her warden at Bristol ; in 1812 Mr. 'Il.. Drummond “detected it in Miller 
and Sweet’s (now Garaway’s), Durdham Down Nurseries at Clifton, Bristol, 
and sent specimens to Dr. Leach, which were forwarded to and figured by 
Férussac. 
Although a very distinct species it is far from being accurately known, 
and from the earliest period has been and is still often confused with 7. halio- 
tidea by otherwise competent conchologists. M. Draparnaud figured un- 
doubted 7. mauge? as the adult form of 7. haliotidea, while Moquin-T'andon 
also figures what is probably the present species as 7° haliotidea v. scutulum. 
Gassies and Fischer, the able monographer rs of the genus, in their great 
work, ‘“ Monographie du genre 'l'estacelle” (pl. 1., f. 15) illustrate the repro- 
ductive organs of 7. haliotidea, but erroneously ascribe them to the present 
species ; this unfortunate confusion was accepted and endorsed in some of 
their writings by the famous limacologists, Simroth and Pollonera, and to 
add to these) regrettable mistakes, the jalliin: French biologist, Prof. Lacaze- 
Duthiers, has in his otherwise masterly work, ‘‘ Histoire de la 'l'estacelle,” 
perpetuated further misapprehension of the organization of this species, 
with which he was evidently unacquainted. 
The organization of 7. maugei is of a simpler and more primitive type 
than that of its congeners, and its more marked restriction to the confines 
of Western Hurope confirms this species as being the most ancient form of 
our Testacellw. 
Diagnosis.—ExTERNALLY, 7. maugei is readily recognisable by its large, 
convex, and semi-cylindrical shell, and by the lateral grooves upon the body 
of the animal being so wide apart at their origin at the peripallial furrow. 
INTERNALLY, the distinctive features are even more striking, the lingual 
sheath being quite deficient of lateral muscles and possessing only terminal 
retractors, while the right and left tentacular retractors are both affixed to the 
integument quite on the left side of the animal; the penis sheath differs 
from that of 7. scu¢ulum in its strikingly clavate shape, and from 7’. halio- 
tidea in the absence of the flagellum which is so marked a feature in that 
species. 
