OF SOUTHERN INDIA. 415 
C. ACTHON, Montfort, 1810. 
1. Acton (SOLIDULA) SEMEN, Forbes, sp. Pl. XXVII, Figs. 5, 6, 7. 
1846. Tornatella semen, Forbes, Trans. Geol. Soc., Lond., VII, p. 135. 
1850. <Acteon id., d’Orb., Prod. II, p. 219 ;—idem auctorum. 
Act. testa crassiuscula, ovato-elongata, anfractibus sub-convexis, postice ad 
suturam obtuse abbreviatis, spira turriculata, ultimo anfractu cylindraceo ; superficie 
lirata, striis incrementi minutissimis notata, liris latis, levigatis, sulcis multum angus- 
tioribus, postice crasse punctatis ; apertura ovata, labro ad marginem tenui, intus 
brevi-sulcato, antice late, haud profunde insinuato, labio tenui; columella antice 
duabus plicis obliquis instructa. 
Spiral angle 50°- 65°; sutural angle 8°- 10°. 
Fig. 5. Fig. 6. Fig. 7. 
Height of spire : total of shell (consd. as 1:00) vee =040.7 0°52. 0°40. 
Width of last whorl : height of shell (consd. as 1:00)... 0°48. 0°49, 059. 
The characteristic distinctions of this species are the rather solid structure of 
the shell, with deeply punctated and narrow spiral sulcations, the produced spire 
and the cylindrical shape of the last volution, which is, like all the previous ones, 
truncated posteriorly along the suture. The columellar folds are rather anterior 
and somewhat distant from each other, though they approximate much more at 
the lip of a perfect specimen. ‘The two specimens represented under figures 6 and 7 
are from the white limestone of Ninnyoor; they appear to have the last whorl 
somewhat shorter in proportion to the height of the shell and less cylindrical in 
shape, but I do not think that these differences are sufficient to warrant specific 
distinction. 
This is the species described by Prof. Forbes under the above name, though 
he has figured a different shell for it, Act. seminatus, n. sp. 
In form it is closely allied to Act. affinis, Sow., from Blackdown, but this last one 
is said to have a posterior fold on the inner lip, though I have not been able to 
detect it in several of the Blackdown specimens. 
Localities —Garudamungalum, in bluish sandstone, common; Ninnyoor, in 
whitish limestone; very rare. 
Formations.—Trichinopoly and Arrialoor groups. 
2. Actmon (SoLmpuLA) PuGILIs, Stoliczka, Pl. XXVII, Figs. 8, 9. 
Act. testa ovato-elongato, anfractibus numerosis, convexiusculis, postice ad 
suturam adpressis, sulcis angustis, undique puncturatis notatis composita, liris trans- 
versaliter striolatis ; apertura angusta, columella antice oblique biplicata. 
Spiral angle 60°- 65°; sutural angle 6°- 10°. 
Fig. 8. Fig. 9. 
Height of spire : total of shell (considered as 1:00) ie 1. O71389 0°41. 
Width of shell : itsheight... ( a sae) Mans .. 0°50 0°50. 
The obtusely acuminate form of the spire and the greater convexity of the 
whorls, which are posteriorly at the sutures slightly contracted, but not truncated, 
