452 Transactions. 



backwards into a shallow crescent. Spiral threads sharp, 10 in the pen- 

 ultimate whorl, 8 in the whorl above it ; the threads pass over the 

 costae without any interruption. Body-whorl with a large shallow groove 

 in the middle, thus forming two carinae ; the costae stop at the upper 

 end of this groove, but the spiral threads are continuous to the end of 

 the canal. Spire of 5 whorls, each shouldered ; suture impressed but not 

 canaliculate. Aperture with a thick inner lip, the callosity covering part 

 of the base. 



Several specimens, in a moderate state of preservation. Type in the 

 Otago Museum. 



In size this species closely resembles S. parva of Hutton, but it is more 

 elongated and the costae and spiral bands are more distinct. The genus 

 Struthiolaria occurs in the Tertiary formations of Chile and Patagonia, but 

 the age of these is uncertain. Wilckens regards them as Miocene. In the 

 Cretaceous of those countries Struthiolariopsis occurs, but this genus is not 

 admitted by Cossmann. 



Struthiolaria (Pelicaria) sp. 



A large specimen, 52 mm. by 45 mm. Shell nodulous and turreted with 

 three carinae on the body-whorl. A very large callosity extends to the top 

 of the spire. Not well enough preserved for a full description. 



Ampullina spiralis n. sp. (Plate XXXIV, fig. 17.) 



Shell of moderate size, 25 mm. by 20 mm., a larger specimen 25 mm. 

 wide. Shell subglobose, striated. Sculpture consisting of somewhat shallow 

 spiral grooves with intervening flat ridges of irregular width ; lines of 

 growth numerous and thin, with an occasional thick one ; a strong spiral 

 groove just below the suture. Spire low, conoidal, consisting of 4 convex 

 whorls. Body-whorls large in proportion, suture slightly impressed. Aper- 

 ture nearly vertical, semilunar ; outer lip thin ; inner lip with some callus. 

 Umbilicus distinct. 



Three specimens, in moderate state of preservation. Type in the Otago 

 Museum. 



Suter remarks that this genus occurs in the Tertiary. 



Architectonica inornata n. sp. (Plate XXXIV, fig. 9.) 



Length, 6 mm. width, 13 mm. 



Shell subdiscoidal. Whorls spirally unisulcate near the suture. Lines 

 of growth conspicuous. Body-whorl with a prominent carina. One spiral 

 ridge on the base a quarter of the distance from the carina to the um- 

 bilicus ; 2 small spiral ridges above the carina ; 2 others and a large 

 rounded rib near the suture ; the intervening distance between the upper 

 and lower ridges with very fine spiral lines. Suture distinct but not 

 strongly marked. Lines of growth numerous and distinct all over the 

 body- whorl. Umbilicus large, its border much crenulated. 



One specimen only. Type in the Otago Museum. 



Architectonica is said by Suter to occur in the Tertiary. Cossmann, who 

 uses Lamarck's name Solarium for this genus, mentions the occurrence of 

 two doubtful species from the Eocene, one from the Oligocene, and a num- 

 ber from the Pliocene and subsequent periods.* 



* Ess. de Conch, comp., 1915, p. 165. 



