Gen. Conchyliolithus. Fam. ANOMiXiE. 7 
Specimen e. is the mmcleus of the petrifaction, wholly divested of the coats or layers, and con- 
sequently exhibiting the interior form of the original — This, as in most anomt>, appears to have 
been very remarkable — Near the beak of the nucleus arise two large, rounded gibbosities, one on 
each side, somewhat flattened, wrinkled on the surface, and surrounded by a strong furrow; 
beneath these, towards the margin, two others, generally less in diameter, but more convex or 
prominent, and with their surface smooth, without furrows or wrinkles. It is evident that these 
prominences in the cast, must have taken their form from cavities on the inner surface of the 
original shell ; the use of these cavities, however, it will be scarcely possible to ascertain Perhaps 
those near the beak might contain the twisted appendages which are peculiar to the genus anomia, 
and which were first noticed, we believe, by Davila*, and described by him as two slender, gristly 
ligaments, proceeding from each side of the inner part of the beak, and returning to it again after 
various involutions. The furrows, surrounding the upper gibbosities of our fossil, are probably 
impressions from these appendages ; or, at least, from some other bodies of a like nature. Nuclei 
similar in form are not uncommon to many other of the imperforated anomihe. 
5. Conch. Anomites subrotundus, longitudinaliter sulcatus sfriatusque : 
striis tuberculatis, valva altera subglobosa. 
Tab. 16. Fig. 2. 
Thick-beaked jdnomite. 
Sedes ; strata vetusta, calcaria. 
Common in most parts of the county where limestone occurs. 
Obs. The varieties in this fossil are nearly the same as in giganteus, from which, as before 
remarked, it scarcely differs but in size, and the want of the extended sides, which particularly 
mark that species. They both, perhaps, originate only from different growths of the same shell ; 
but, as we have not, as yet, observed in any specimens the intermediate form, which mu.st natu- 
rally ensue from this supposed difference of growth, we have thought it right to consider them, at 
present, as distinct species. 
6 . Conch. Anomites semiorbiculatus, valva plana decussatem stiiata, altera 
gibbosa longitudinaliter striata, natem versus transversim rugosa. 
Tab. 32. Fig. 1, 2, 3. Tab. 33. Fig. 4. 
Farieiates. 
a. V. nate valvulte convexae tequata. 
V. — — — — — gibbo trilobato notata. 
Semireticulated Anomite. 
crassus. 
semireti- 
culatus. 
* Catalogue Systematique & Baisonn4e. 
