ACTAONINA. 471 
whorl (fig. 16 a), but are well marked where the anterior compression commences. 
Aperture ovate-elongate with a thin straight outer lip and a smooth columella. 
Relations and Distribution.— Differs from Actxonina pulla in the fineness of 
the striations, though, if we accept the view of Stoliczka, this may be somewhat a 
matter of preservation. Resembles Actxonina sparsisulcata, d’Orbigny (‘ Terr. 
Jur.,’ ii, p. 166, pl. 285, figs. 14 and 15). This form occurs in the Lincolnshire 
Limestone at Weldon, in the Parkinsoni-zone of Burton Bradstock, and in the 
Cadomensis-bed at Oborne. 
Since I do not venture to constitute this as a distinct species, it may be 
regarded as a possible variety of Actwonina pulla. 
417. AcTr#ONINA (STRIACTHONINA) TENUISTRIATA, sp. nov. Plate XLII, figs. 18, 19, 
19a. 
1885. AcTHONINA HUMERALIS, Phillips, striated variety. Hudleston, Geol. Mag., 
1885, p. 202, pl. v, 
fig. 3. 
Cf. also Acrmonina Sartuacensis, d’Orbigny. Terr. Jur., vol. ii, p. 167, pl. celxxxvi, 
figs. 1 and 2. 
Description : 
Height ‘ ; : ; ~  L2mam: 
Body whorl to total height : 5 a (idee UD. 
Spiral angle : d ; = 60%. 
Shell cylindro-conical; the spire occupies about one fourth of the total height, 
and consists of five or six whorls, which are cylindrical with tabulate posterior 
margin, except towards the very sharp apex, where they are slightly convex. The 
entire shell is pervaded by fine and close striato-punctate ornament. There is a 
strongly impressed line on the posterior margin of the whorls, and a somewhat 
finer line on the flat area between the margin and the suture. The body-whorl is 
a narrow cylinder much compressed anteriorly ; aperture ovate-elongate with a 
smooth columella. 
Relations and Distribution.—This may be regarded as a narrow represeutative 
of Acteonina Sarthacensis ona lower horizon. (Cossmann says that A. Sarthacensis 
is really a Bathonian species, and not Bajocian as represented by d’Orbigny.) On 
the other hand, if we accept the suggestion of Stoliczka as regards striation in the 
Tornatellide, Actxonina tenuistriata may be nothing more than a different mineral 
condition of Acteonina humeralis. This was the view I took in 1885. There are, 
however, certain slight differences of shape which favour the notion of their being 
distinct species. 
