20-i JF. H. Hudleston — On the Yorkshire Oolites. 



gi'ound that it had already been given by Sowerby to another species. 

 This objection is not regarded as valid. 



Phillips, in his last edition, says that Act. gigantea occurs in the 

 G. 0. (? Grey Oolite) of the White Nab : i.e. on the horizon of the 

 Scarborough Limestone. The only specimen ever seen by me is 

 the one in the Bean Collection at the British Museum ; this is a 

 cast, and probably comes from the Millepore Rock of Sycarham just 

 round the north point of Cloughton Wyke. I believe it to be the 

 same specimen as the one figured by Morris and Lycett. It has a 

 wider spiral angle than D'Orbigny allow^s, and may be regarded as 

 an obtuse variety, approaching certain forms of Act. Scarbiirgensis. 

 Indeed, except in being longer, the Millepore specimen referred to 

 Act. gigantea is scarcely to be distinguished from the variety of Act. 

 Scarburgensis figured herewith (Fig. 9). In the Millepore specimen 

 the aperture is proportionally shorter. It was evidently a shell with 

 a very thin test, hence its occurrence for the most part as a cast. 



Stated to occur in the upper beds of the I.O. at Minchinhampton. 



88. — AcT^ONiNA Scarburgensis, Lycett, 1863. Plate V. Figs. 



9, 9a. 



1863. Actceonina Scarburgensis, Lye. Supp. Gt. Ool. Moll. p. 28, pi. xxxiii. fig. 13. 

 1875. Actceonina Scarbiirgensis, Lye. Pliillips, G.Y. 3rd ed. p. 260. 



Bibliography, etc. — The author describes his species as ventricose, 

 being shoi'ter and more tumid than Act. convoluta. Lye. Length 14 

 lines ; diameter of last volution 10 lines. The test, which is thin, 

 is partially preserved : it has a corneous aspect. From a single 

 specimen in the Leckenby Collection. 



Descriptions, A. — Elongate variety. Specimen from the Coi'n- 

 brash (zone 4), Scarborough. My collection. Almost in the condition 

 of a cast. Figs. 9, 9a. 



Height 35 millimetres. 



Proportion of width to entire height 51 : 100. 



Spiral angle 70°. 



Height of body-whorl to entire shell 70 : 100. 



Shell oval, smooth, and composed of 6 or 7 whorls, with a spire 

 about three-tenths the entire height ; suture slightly sunk. The 

 whorls are rounded at the shoulder, sub-compressed at the sides. 

 Body-whorl large and moderately ventricose, but with flat sides. 

 The aperture is thoroughly characteristic of Actceonina. There is 

 probably some indication of a slight umbilical slit. 



A portion of the shell towards the base is preserved, being rather 

 less than \ mm. in thickness, and portions of the inner layer of the 

 shell of extreme tenuity adhere to the cast and retain the impression 

 of the lines of growth. 



Another specimen, B. — Ventricose variety. Same horizon and 

 locality. Leckenby Collection. Not figured. 



This resembles Lycett's type (which is also in the same collection), 

 but it has a more perfect spire, though less shell on the body-whorl. 

 The spiral angle is nearly 80°. In the spire alone 7 whorls are pre- 

 served, and exhibit the channelling of the suture very distinctly. 

 The body-whorl is relatively shorter and stouter than in the speci- 



