4.60 CRETACEOUS GASTROPODA 
posterior sutural ones are the strongest; the intermediate tubercles being much 
smaller. The species resembles in other respect Cerith. Arcotense, but its whorls 
appear to be broader in proportion. 
CERITHIUM SCALAROIDEUM, Forbes, p. 201. 
On p. 202, line three from above, add the following note after the word Nor- 
folk,—Cerith. reticulatum referred to in Woodward’s Geology of Norfolk, is a 
sub-fossil or living species; its form is much more slender than that figured by 
Reuss and quite distinct from the cretaceous species. 
18. CrRITHIUM TRICHINOPOLITENSE, Lurbes, Pl. XVI, Fig. 5, and Pl. XIX, Fig. 4. 
1867. Cerithiwm (Sandbergeria) antecedens, Stol., antea p. 202. 
The examination of Forbes’ original has shown that both are identical. Forbes’ 
figure is rather insufficient, showing the spiral striation indistinctly. There are 
from 3 to 5 stronger spiral strize with some smaller ones between them. 
A large number of new species belonging to Cerithium are figured by Guéranger in his Album 
paléont., 1867. 
XXI. Fumnily,—_UELANIID A. 
With regard to a large number of interesting species and genera belonging 
to this and allied families the American Journal of Conchology and Journal of 
Academy of Natural Sciences of Philadelphia ought to be consulted. 
XXXVI. Pamily,—RISSOIDA. 
P.277. Rissoa Bosqueti, Miller (Suppl. to Petreef. Aachner Kreidef., 1859, 
p. 21, pl. 8, fig. 9) ought to be mentioned here. 
XXXVII. Funily,—HULIMID. 
P. 288. Huchrysalis. Waving since obtained a more detailed account of this 
new genus of Laube I would only draw attention to the very elongated form of 
some of the triassic species ; the aperture is almost in all very small and pointed 
on both ends (see Denksch. Akad., Wien, 1868, XXVIII, pt. IIT, p. 41). 
XXXVITI. Funily,—_NATICIDA. 
P. 295. Ptychostoma, Laube (ibid., p. 17). It seems a little doubtful whether 
this genus will stand as it was instituted. The type species Pt. plewrotomoides 
(not plewratomoides) as also Pé. gracile very much resemble Scalenostoma, Desh. 
(P YRAMIDELLIDA, see p. 459) and the third species Pé. Sancte-crucis appears to be 
closely allied to Neritoma, Morris (see p. 337). 
