Marshall. — The Wangaloa Beds. 455 



more numerous and more nearly equal, and the tubercles are relatively 

 larger, borne on more widely separated spiral carinae, and are not arranged 

 on definite vertical costae. The canal in both this species and P. brevirostris 

 is shorter than in typical forms of Perissolax. Fischer treats Perissolax 

 as a subgenus under Tudicula." 



Dr. Stanton further says that P. brevirostris is found in the Chico forma- 

 tion, of Cretaceous age, and this is separated by an unconformity from the 

 Martinez formation, of Lowest Eocene age, in which Heteroternta gabbi is 

 found. 



Cossmann says of the genus Perissolax (loc. cit., p. 72), " Bien que je sois 

 persuade que ce sous-genre est bien realite identique a Pyropsis- — c'est 

 a dire, a Tudicula- — et que les differences signalees sont due a l'etat de con- 

 servation de ces fossiles cretaciques, je conserve provisoirement Perissolax, 

 qui ne m'est connu que par des figures, probablement inexactes ou res- 

 taurees d'apres les moules ou des contre-empreintes."* 



Tudicula sulcata n. sp. (Plate XXXV, fig. 19.) 



Shell small, 17 mm. by 7 mm. Shell piroidal with a short spire. The 

 whorls of the spire are almost flat, with impressed sutures but without 

 distinct scuplture. Body-whorl large, with a large anterior canal longer 

 than the spire. Carina with a prominent ridge, with a somewhat smaller 

 one on either side. Five smaller spiral ridges between these and the 

 suture. Other similar but smaller ridges on the anterior canal. Outer lip 

 thin. Inner lip with a thin callus. 



Several specimens, but only one of them shows the beak complete. Type 

 in the Otago Museum. 



This species was first placed by Mr. Suter in the genus Latirus (Mazza- 

 lina), but a more perfect specimen caused him to classify it with Tudicula. 



Latirus (Mazzalina) longirostris n. sp. (Plate XXXIV, fig. 18.) 



Shell small, 8 mm. by 5 mm., piroidal with a long anterior canal. Spire 

 short, consisting of 4 whorls, which have a smooth surface. Suture 

 distinct, impressed. Body-whorl large, marked with 10 prominent spiral 

 striae about as broad as the intervening grooves ; similar striations extend 

 to the end of the anterior canal, which is long and straight. Outer lip thin. 

 Inner lip covered with a thin callus. 



Several specimens, in moderate condition. Type in the Otago Museum. 



The genus extends from the Cretaceous to the present day. I am in- 

 debted to Mr. Suter for the reference of this species to the genus. Better 

 specimens, however, make it probable that a change will have to be made. 



Cominella sublurida n. sp. (Plate XXXVI, fig. 33.) 



Shell moderate size, 26 mm. high and 13 mm. wide. Shape ovate, 

 spirally Urate and axially costate. Sculpture consisting of flat spiral lirae of 

 unequal size with linear interspaces. Axial costae present on all the whorls, 

 extending from the angle of the shoulder to the suture-line in front, but 



* Cossmann in a letter makes the same remark on this species as on Heteroterma 

 zelandica. In a recent publication Roy E. Dickerson records species of Perissolax from 

 the Martinez (Lower Eocene) and from the Tejon (Upper Eocene) of California. (R. E. 

 Dickerson, Fauna of the Martinez Eocene of California, Bull. Dep. Geol. Univ. Cat., 

 vol. 8, No. 6, 1914, p. 110 ; Stratigraphy and Fauna of the Tejon Eocene of California, 

 Bull. Dep. Geol. Univ. Col., vol. 9, No. 17, 1916, p. 451.) 



