HYPERLIOCERAS DESORI. 97 



thick variety. The carina at the top of the figure gives it an appearance of being 

 hollow-keeled ; but this is only due to the ventral area being broken away, and the 

 outline not being so represented by the artist. Plate XVIII, fig. 3, is the front 

 view of the same fossil, in outline. This specimen came from Bradford Abbas, and 

 was collected by my father. Plate XVIII, figs. 4 and 5, illustrate the two views of 

 a smaller specimen of this peculiar variety, which is smooth at a very early age. 

 Plate XVI, figs. 12 and 13, give a young specimen of the species, with its test 

 well preserved. 



Hyperltoceras Desori (Moesch). Plate XVII, figs. 6 and 7. 



1867. Ammonites Desoei, Moesch. Der Aargauer Jura ; Beitrage Geol. Karte 



Schweiz, pi. i, figs. 8 a, b. 



1885. Haepoceeas Desoei, Hang. Beitrage Monog. Harpoceras ; Neues Jabr- 



buch fur Min., &c. Beil.-Bd. iii, p. 624. 



Discoidal, compressed, strongly carinate, almost without umbilicus; whorls 

 broad, ornamented with sigmoidal lines of growth well curved on lateral and 

 ventral areas (faintly marked ribs on outer area) ; whorls sloping slightly from the 

 middle towards the ventral area, which is flat and narrow, and carries a large 

 distinct carina. Inner margin concave, with the upper portion overhanging the 

 lower, thus still further occluding the very small umbilicus, and causing it to 

 resemble a female screw. A small portion of each of the inner whorls is not 



they yield is — with the fewest possible exceptions in the case of the railway-cutting, — exactly the same 

 (see above, p. 5). Fossils for which I give tbe locality as Bradford Abbas may have come from either 

 of these three places, or from some of the numerous openings which have from time to time been made 

 in different parts of the parish. I never thought it necessary to use distinctive labels for the specimens 

 from these places, save in a few exceptional instances ; but I was most particular to do so in other 

 cases when any question of a different development of strata came in, even though the localities might 

 be very close together. Babylon Hill lies within the parish of Bradford Abbas, and has probably 

 supplied many of the fossils labelled as from Teovil, a town in the adjoining County of Somerset. 



In order to make everything as clear as possible, I would expressly mention a matter which still 

 does not seem to be properly understood, namely, that the Cephalopoda-bed of Gloucestershire, and 

 the Cephalopoda-bed of Dorset, are on two totally different horizons. The former contains the 

 Opalinum-zone and Striatulurn-beds ; the latter name was loosely used to cover the half dozen feet of 

 rock at Bradford Abbas containing the Murchisoncs-zone, the Concavum-beds, and the representatives of 

 the Sauzei- and Sumphriesianum-zones. It was also extended to include the greater development of 

 Humphriesianum-zoue near Sherborne. Considering that the term " Cephalopoda-bed " was applied 

 to the Dorset Inferior -Oolite strata under the totally erroneous idea that they coincided with the 

 Gloucestershire bed of that name, it seems to me advisable that the term should be dropped altogether 

 so far as Dorset is concerned. 



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