200 DE. C. T. TRECHMAT^X OX [vol. Ixxiil, 



From the description it is clear that Mojsisovics only had shells 

 in the young stage. Some of those that I obtained, and apparently 

 identified correctly with Halohia liochstetteri, reach a much more 

 adult stage, and show the sudden forwai'd bending of the ribs. 



He goes on to sa}" that Lindstrom rightly considered this form 

 to be distinct from Daonella lomnieli, but erred in identifying it 

 (though under reserve) wdth the Spitsbergen form H. zitfeli, from 

 which it is easily distinguished by its less numerous, wider, and 

 more often w^a^y ribs. He compares it with S. "riigosa, a form 

 Avhich attains a wide horizontal range in the E aropean Alps, Bittner^ 

 regards H. lioclistetteri as more closely related to S. zitteli 

 than to H. rugoaa, an opinion with which I thoroughly agree. 



Tlie specimens illustrated by Mojsisovics were said to come from 

 the 2Ionotis-ric]iniondic(na Beds at Kichmond, near Nelson. By 

 analogy with the Alpine and Spitsbergen Halobias he places this 

 form high in the Carnic, in which case it should not occur with 

 -Pseudomonotis richinondiana, a Noric fossil. I never saw any 

 Halobias in the Pseudomonotis Beds in New Zealand, and 

 -Ps. richmondiana generally . occurs entirely by itself. I think, 

 therefore, that the specimens that Hochstetter obtained must be 

 from some other locality, possibly the Wairoa Gorge. Arthaber ^ 

 attributes Halohia hochsfetteri to a Noric horizon, probably 

 because of its supposed occurrence in the same bed as Pseudo- 

 monotis richmondiana. 



Halobia cf. AUSTEiACA Mojsisovics. (PL XXI, fig. 4.) 



1874. ' Uebev die Triadischen Pelecvpodeiigattungen Daonella & Halohia ' p. 26 

 & pi. iv, figs. 12-13, pi. V, tig. 14. 



The shell is about as long as it is high ; the beak is slightly 

 •directed forwards ; the ribs are not ver}'^ numerous, flattened, 

 irregular in width, and separated by rather sharply-cut furrows, 

 some of which are deeper than others. The ribs are finer and 

 more closely set on the posterior portion of the shell. Near the 

 liinder hinge-margin a considerable portion of the shell is smooth. 

 The primary ribs are split at various distances below the beak 

 into two or four secondary ribs. The anterior ear is rather wide ; 

 it bears one or two faint radial ribs, and is not sharply differ- 

 -entiated from the rest of the shell. Concentric ripples are most 

 prominent on the umbonal region, and pass across the anterior ear 

 iis well as over the I'est of the shell. A specimen in my collection, 

 which has the margins somewhat broken, measures about 2G mm. 

 in length and 24 mm. in height. 



Locality and horizon. — Bed e, Otamita, Hokonui Hills, 

 where I collected three or four specimens, none of them very well 

 preserved. Carnic. 



Be marks. — This shell apparently belongs to the group of 

 Halobia rarestriata of the classification of Mojsisovics ; it comes 



^ Eibliography, 6, xlv, p. 254. 

 - Bibliography, 13, p. 241. 



