416 CRETACEOUS GASTROPODA 
readily distinguish this species from Act. turriculatus, n. sp. The spiral sulcations 
also appear to be somewhat finer and the transverse striation of the ribbings, 
representing the strive of growth, a little more distinct, than in the previous species. 
Locality —Comarapolliam, in whitish, siliceous, soft sandstone ; very rare. 
Formation.—Arrialoor group. 
2 Acrmon sEMINATUS, Stoliczka, Pl. XXVII, Fig. 16; Pl. XXVIII, Fig. 18. 
1846. (Tornatella semen) Forbes in Trans. Geol. Soc., Lond., VII, Pl. 15, Fig. 2: non idem, p. 135). 
Act. testa ovata, tenwi, polita, spira sub-turrita, apice acuminata; anfractibus 
convexiusculis, postice rotundate truncatis, duabus seu tribus stris punctatis, approxi- 
matis instructis ; ultimo anfractu sub-inflato, spira altiore, distanter spiraliter striato- 
punctato ; apertura ovata, columella wriplicata. 
Spiral angle 80°; sutural angle 6°. 
Height of spire : total of shell ... (considered as 1:00) on Be O:4.05 
Width of last whorl : height of shell ( > Hp) 503 ae 0;655 
Shell oval, consisting of five or six, slightly convex, and_ posteriorly sub- 
truncate whorls, which are near the suture marked with two or three spiral, 
punctated lines; the last whorl is higher than the spire and ornamented with 
similarly punctated, rather distant spiral lines; the columella has one fold. 
The thick ovate form and the posteriorly truncated whorls distinguish this 
species from others. Forbes gave a figure of it under the name of 7. semen, 
although his description is taken from another specimen, both being represented 
in Messrs. Cunliffe and Kay’s collection, presented to the Geological Society of 
London. 
Locality. —Garudamungalum, in bluish, calcareous sandstone; not rare. 
Formation.—Trichinopoly group. 
4, AcTrmon tTuRRICULATUS, Stoliczka, Pl. XXVII, Figs. 10-11; Pl. XXVIII, 
Fig. 19. 
Act. testa ovato-elongata, crassiuscula, polita, spira elevata, acuminata, an- 
fractibus convexiusculis, postice ad suturam paulo contractis, adpressis, spiraliter 
numerose punctato-striatis ; ultimo anfractu spira altiore, similariter punctato-striato, 
striis fortioribus distantibus, una vel duabus tenuioribus interpositis alternantibus ; 
apertura ovata, postice acuminata, antice rotundata, labro intus levi, ad marginem 
acuto, antice late ac leviter effuso, labio postice tenuissimo, antice crassiore, plica 
unica, torta, obliqua instructo, 
Spiral angle 50°- 60°; sutural angle 5°. 
Height of the spire ; total of shell ... (considered as 1:00) ve 0:39. 
Width of last whorl : height of shell .,. ( op » m)) O00 0:50. 
This species is distinguished from Act. seminatus, n. sp., by its more elongated 
form, and by having the whorls posteriorly not truncated, but slightly contracted 
and adpressed at the suture. The spiral punctated lines are posteriorly very 
