444 CRETACEOUS GASTROPODA 
29-33. Dent. fragile, and Dent. gracile of Meek and Hayden, D. subarcuatum, Conr., D. nanai- 
moense, Meek, and D. Ripleanum, Gabb, mostly appear to belong to Dentalium. 
84. Dent. pauperculum, Meek and Hayden, is an Antale. 
35. Dent. Chilense, D’Orb., very much resembles in form our Antale. 
36-37. Dent. Cooperii and stramineum, Gabb, Pal. Calif., I, p. 1389, are true Dentalia. 
88. Dent. ( Ditrupa) pusillum, Gabb, ibid., is a Gadila. 
39. Dent. syriacum, Conrad, from Palestine, is either an Antale or a Pyrgopolon. 
40. Dent. cretaceum, Conrad, from Syria, I do not know. 
241-42. Dent. Wilsoni and octocostatum of Fraas from Palestine (Wirtemb. Jaresh., XXIII, 
p- 239) are probably Annelides. 
In our South Indian cretaceous rocks occur four species, the descriptions of which are given 
below :—= 
43.  Dentalium crassulum, Stol. 
44, Antale Arecotinum, Forbes, sp. 
45, »  glabratum, Stol. 
46. Fustiaria parvula, Stol. 
Dent. hamatum, Forbes, (Trans. Geol. Soc., London, VII, p. 188, Pl. XV, Fig. 8), is, according 
to the originals, examined by me in the London Geological Society’s collection, based upon an 
imperfect cast of a longitudinally ribbed Serpula. Forbes’ original figure is taken from a fragment 
imbedded in a calcareous sandstone, which is wholly perforated with these Annelid tubes, the shells 
being thick; externally they appear to have four longitudinal somewhat distant ribs on one-half of 
the circuit and five somewhat closer set on the other. The external layer of the shell is more compact 
than the inner, which breaks in thin lamelle. On the section the longitudinal ribs are perfectly 
clearly traceable, but the shell is so thoroughly attached to the rock that it always only leaves 
the cast visible as soon as the specimen is broken longitudinally. 
CVIII. DENTALIUM, Aldrovandus, 1642. 
1. DentTatium crassuLtum, Sfoliczka, Pl. XXVII, Fig. 21. 
Dent. testa crassa, elongata, parum curvata, longitudinaliter costis undenis 
crassioribus atque nonnullis minoribus interpositis ornata, transversaliter minutissime 
striolata ; sectione rotundata. 
This species is distinguished from allied forms, like Dent. decussatum, Sow., 
and D. nutans, Kner, by the number of distant longitudinal stronger ribs, being 
eleven in the entire circumference, and having sometimes two to three thinner ribs 
between them. Two of the stronger ribs on the left side, but near the median dorsal 
line, are generally somewhat more approximate than the others. The posterior 
termination is rather sharply pointed, though its surface is a little corroded on most 
of our specimens ; there is, however, no slit present. 
Locality —South of Serdamungalum, in yellowish arenaceous limestone ; appa- 
rently very rare. 
Formation.—Trichinopoly group. 
