NATICA. 
259 
probable that most of the Buspiroid Naticas of the Inferior Oolite possess this 
character, but it can only be seen under certain conditions. 
Var. GLOBATA. Plate XX, figs. 5 and 6. 
Description : 
Spiral angle . . . 95° — 100°. 
Height of body- whorl to entire shell . . 76 : 100. 
The chief characteristics of this variety are a more globose and sloping body- 
whorl, and a somewhat shorter spire. The canaliculation is but slight, and the 
Buspiroid character less evident. This is a case where it is not so easy to 
formulate a distinction between Natica and Euspira. The larger specimen 
(fig. 5) is from the concavus-hed at Bradford Abbas, where this variety occurs to 
some extent. The aperture is semilunar and effuse; fine lines of growth are 
decussated by fine spiral lines (not visible without the aid of a lens), and besides 
this are two or three larger lines, like undeveloped carinse. Such globose forms 
seem to point somewhat in the direction of Natica cincta. Specimens occur more 
or less intermediate between the angular and globose varieties, 'l^he most globose 
of all are those in the Lower Trigonia-grit (fig. 6), which is probably about the 
same horizon as the concavus-hed at Bradford Abbas. 
195. Natica, cf. Loeieei, d’Orbigny, 1850. Plate XX, fig. 8. 
1850. Natica Loeieei, d'Orligny. Prod., i, p. 264. 
1852. — — — Terr. Jur., ii, p. 190, pi. cclxxxix, figs. 6, 7, 
Bibliography i ^c. — D^Orbigny was the first to point out that a form similar to 
Natica adducta, but more elongate and having a smaller spiral angle, occurs in the 
Inferior Oolite of Asnieres (Sarthe) and Niort (Deux Sevres). This he called 
Natica Lorieri; it is described as having an umbilical fissure. The Bnglish 
specimens which I have ventured to assign to this species, either directly or as 
varieties, show but little trace of umbilicus. However, the mere presence or 
absence of an almost invisible umbilical fissure ought not to have much weight. 
Description : 
Spiral angle ..... 80°. 
Height of body- whorl to entire shell . . 72 : 100. 
Length ..... 25 — 30 mm. 
