338 G. T. Trechmann — Cretaceous Mollusca 



none of the figures show the elevated protoconch of the Xew 

 Zealand shell. 



Locality. — Selwyn Rapids, rather common in one piece of rock. 



HOLCODISCDS (KOSSMATICERAS) GEMMATU8, Hlipe. (PI. XXI, Pig. 6.) 



Ammonites gemmatus, Hupe, Gay's Hist. Chile, 8, 35, pi. i, fig. 3, 1854. 

 Holcodiscus gemmatus, Hupe, Steinmann, " Ceph. d. Quiriquina Schichten " : 



N.J. fur Min., Beil. Bd. x, p. 68, pi. vi, figs, la, b, 2a, b, 1895. 

 Wilckens, " Kevision d. Fauna der Quiriquina Schichten": N.J. fur Min., 



Beil. Bd. xviii, p. 187, 1904. 

 Kilian et Beboul, " Les Cephalopodes Neocretac^s des iles Seymour et Snow 



Hill" : Wissensch. Ergebnisse der Schwed. Sudpolar Exped., Stockholm, 



1909. 

 A fragment of an Ammonite was obtained at Selwyn Rapids, but 

 owing to the blasting operation only about a third of the sutured 

 portion of the last whorl could be found. It has been partly crushed 

 and the sutures cannot be made out without destroying the specimen, 

 but the outer shell with its ornamentation is very well preserved. 

 The last whorl embraces about half the previous one and the umbilical 

 slope is steep, almost vertical. The venter is rounded and the ribs 

 cross it with great regularity. They are equally spaced on the 

 venter, but are less regular on the sides. Only about half the 

 number of ribs that cross the venter reach the umbilical shoulder, 

 approximately every alternate rib disappears rather less than half- 

 way from the venter to the umbilical slope. Of those that continue 

 two or occasionally three unite at the umbilical shoulder to form 

 a series of rather closely spaced sharp oval nodes whose apices are 

 directed backwards. The ribs are slightly sinuous on the sides. 



This fragment agrees so closely in external ornamentation with 

 the examples figured from Quiriquina and Antarctica that there can 

 be no doubt of its identity. It is common in the Upper Cretaceous 

 of Seymour Island, but has not been found in South Patagonia, 

 where, however, the three Indian species, IT. Theobaldtnus, Bhawani, 

 and JEmilianus, all of Stoliczka, occur. In addition to the three 

 forms just mentioned the Aryalur Beds of the Indian Senonian yield 

 the closely allied species, S. Madrasinus, Stol., Kandi, Stol., and 

 Kalika, Stol. 



Locality, — Selwyn Rapids, one specimen. 



Belemnites sp. (PI. XXI, Fig. 9.) 



A single Belemnite fragment was collected at Selwyn Rapids. 

 It measures 24 mm. in length and forms the terminal part of a guard, 

 but no trace of phragmocone remains. It seems to have been rolled 

 and is split in two pieces longitudinally. The rock adheres so 

 closely to the outer surface that very little of this is visible. In size 

 and shape it resembles very closely some more or less rolled 

 fragments of Belemnite guards that occur at Brighton, 12 miles 

 south of Dunedin, in a hard pebbly shell bed resting almost directly 

 on the coal, which rests in turn on the eroded schists. Hector called 

 this fossil Belemnites Lindsayi. The bed was classified as Tertiary 

 by the earlier New Zealand geologists, but this correlation will 

 probably have to be revised, and Professor Marshall is inclined to 



