208 rSOCEEDINGS OF THE MALACOLOGICAL SOCIETr. 



evolution was analogous in both hemispheres, while Mr. M. Cossmann 

 (speaking, I am sure, on insufficient evidence) has claimed that this 

 was not the case. The fossil is quite immature, but I incline to the 

 belief that the adult would show a form not very far removed from 

 Psephcea concinnn, Brod." 



The species differs from the typical Lapparia, and partly also from 

 Caricella, by the almost complete absence of spiral sculpture and the 

 presence of five columellar plaits, and it therefore becomes questionable 

 whether it should not form a new subgenus or section of one of the 

 two genera. I have classed it under Lapparia because I think it shows 

 more affinities with that genus than with Caricella. Both genera are 

 recorded from the Eocene and not from newer formations, and it 

 therefore is open to question whether or not part of the Oamaru Series 

 should be relegated to the Oligoccne period. 



An interesting fact was pointed out by the late Captain F. W. 

 Hutton in his "Index Faunae Novae-Zealandise " (p. 17): Several 

 genera of marine mollusca appear in the Eocene of Australia, but 

 did not reach New Zealand until the Miocene and Pliocene periods. 

 I am not sufficiently well actjuainted with the Australian Eocene 

 Volutidaj to say whether forms are known which might be considered 

 the ancestors of our species. 



The species is named in honour of Professor James Park, our 

 distinguished geologist. 



Pleueotoma Pareoraensis, n.sp. PI. XVIII, Fig. 3. 



Shell fusiform, thin and fragile, height of aperture less than that of 

 the spire, upper whorls nodulous, body-whorl finely spirally grooved. 

 The sculpture consists of small oblique nodules on the upper three 

 whorls below the nucleus, but faintly indicated on the following 

 volutions. On the fourth and following whorls shallow, close, spiral 

 grooves adorn the lower half; on the body-whorl a fine spiral groove 

 below the suture is present, and from below the sinus-area subequi- 

 distant, somewhat deeper, spiral grooves occur down to the base. 

 Spire high, turreted. Protoconch lost. Whorls about 8 to 9, flatly 

 shouldered, convex below the periphery, body- whorl convex, con- 

 tracted towards the ba.se. Suture distinct, but shallow. Aperture 

 oblong, shorter than the spire, produced into a prominent, slightly 

 flexuous canal, truncated at the base. Outer lip rather sharp and 

 thin. Columella slightly sinuous and covered by a thin and narrow 

 callus. Sinus distinctly marked by growth periods, broadly rounded, 

 not deep, situate between the suture and periphery. Height about 

 20-22, breadth 6 mm. 



Locality. — White Rock, Pareora River, Canterbury, New Zealand 

 (Professor J. Park). 



Formation. — Labelled " Oamaru Series, Oligocene." Miocene 

 (Professor J. Park, 1905). 



Type in my collection. In outline and sculpture this species stands 

 nearest to Brillia BucJuoumi, Hutton, which, however, is a more 

 solid shell, much more distinctly shouldered, and with the axial costae 

 persisting on all the whorls. 



