120 Transactions. 



Art. X. — Some New Fossil Gastropods. 



By Professor P. MarshaU, M.A., D.Sc, F.G.S., Otago University. 



[Read before the Otago Institute, 7th December, 1915.] 

 Plate XI. 



The following new species, belonging to the genera Pugnelliis and Avellana, 

 which appear to occur in Cretaceous strata only in other parts of the world, 

 were obtained from the younger strata of Otago during the past year. 



Pugnellus australis n. sp. Plate XI, figs. 1, 2, .3. 



Shell of moderately large size, turreted, carinate. Sculpture consists of 

 a conspicuous nodulose spiral rib on the carina, showing 9 nodes on the 

 part of the body-whorl that is not hidden by the very large callosity of the 

 lips. Two other less conspicuous nodulous spiral ribs on the body-whorl. 

 A large number of fine spiral striae on the body-whorl — in all, about 50. 

 Nodules on the body-carina extend backward as ridges, gradually decreasing 

 in size, and disappearing near the suture. Nodules also extended forward 

 and bent round towards the aperture. Nodules near the callosity of the 

 outer lip less pronounced. Spire of 4 whorls, each whorl convex, with a 

 nearly flat base. Suture linear, slightly canaliculate. Aperture narrowly 

 oval, rounded at the top, but with 2 rudimentary canals at the base. 

 Columella straight. Callosity of the outer hp very large — 18 mm. wide. 

 It extends over the top of the spire, and unites with the callosity of the 

 inner lip, and together they cover about half of the body-whorl. The 

 middle part of the outer lip is produced into a prominent rounded claw, 

 with a scaly structure. Columella straight. 



Height, 47 mm. ; width, 40 mm. 



Type and two paratypes in the Otago University Museum, Dunedin. 



Locality. — Wangaloa, South Otago. 



The genus Pugnellus has hitherto been recorded from Cretaceous rocks 

 only. It has rather a wide occurrence, which is, however, almost wholly 

 circum-Pacific. It has been found in the Eipley and the Chico beds of 

 California, the Ariyalur of India, the Quiriquina of Chile, the Cazador of 

 south Patagonia, in the Cretaceous of Borneo and of Libya. It has not 

 yet been found in Australia. 



The genus is closely allied to Conchothyra ; in fact, Wilckens considers 

 the genera may be identical.* Conchothyra is well known to occur in beds 

 at the Selwyn Rapids, Waipara, and the Trelissick basin. It is always 

 associated with a Cretaceous fauna. 



Avellana paucistriata n. sp. Plate XI, figs. 4, 5, 6, 7. 



Shell small, nearly globular. Sculpture a series of about 17 small spiral 

 lines on the body-whorl. Near the base these are narrow, with nearly 

 equal interstices. Towards the middle of the body- whorl they are much 

 wider and flat, with narrow interstices. Those near the suture can hardly 

 be distinguished. In one well-preserved specimen 7 of these spiral ribs 

 are distinct near the base, but there are none on the middle of the whorl, 

 and an additional 2 are developed close to the suture. The interstices are 

 marked by minute transverse ridges. In some specimens 5 spiral lines can 

 be distinguished on the 2nd whorl. Spire short, consisting of 4 whorls. 



* 0. Wilckens, ''Die Lamellibranchiaten, Gastropoden, &c., der oberen Kreide 

 giidpatagoniens," Ber. naturf. Gesellsch. Freiburg, Band 15, p. 20, 1907. 



