GASTROPODA. 65 



It remains to be decided, however, whether this species does not represent 

 one of Messrs. d'Arehiac and Haime's forms. As far as I am able to judge, it 

 bears the strongest similarity to Ovula elongata, d'Aroh., in general shape, but it 

 seems to differ in the generally larger size, the apparently slightly elevated spire 

 and the more flattened outer lip. Whether these differences really exist or not can 

 only be decided by comparison with Messrs d'Arehiac and Haime's original. In the 

 meantime I think it preferable to keep the two forms separate, particularly as 

 nothing is known with regard to the geological horizon of Ovula elongata, d'Arch. 



RACHIGLOSSA. 



Family: TOLUTWM. 

 Genus: STRIGATELLA, Swainson. 



Stkigatblla. spec. PL XVI. fig. 12-12a. 



A cast of a mitriform shell might be referred to this species. The whorls, of 

 which there are five still preserved, the apex being broken off, are slightly rounded 

 and separated by a deep suture. At the beginning they increase very slowly in 

 height, but the last whorl grows so rapidly that it occupies more than half of the 

 total height of 50 mm. Aperture unknown, but apparently high and narrow. 

 Anterior canal short and broad. 



Ornamentation of surface unknown. 



Locality and stratigraphical position. — Mazar Drik, horizon 8. 



Remarks. — The general shape of the shell indicates that it is related to the genus 

 Mitra, but as no columellar folds have been observed, this position is somewhat 

 doubtful. Pending the collection of better preserved specimens, I place it provi- 

 sionally under the generic name of Strigatella, Swainson. 



Genus : VOLUTA : Linn^. 



VOLUTA spec. PI. XVII. fig. 4. 



The pyriform shell attains a height of 100 mm.; the largest specimen, which is 

 considerably damaged, measures 92 mm. in height. It consists of about 3 to 4 low 

 whorls, forming a depressed spire and an enormous ventricose body whorl, which is 

 anteriorly attenuated. As far as can be seen, it ends in a short/broad, anterior canal. 

 The aperture is high, oval, but rather narrow ; the outer lip is apparently sharp. 



Locality and stratigraphical position.-M^ziv Drik, horizon 8 ; D6s valley, 

 horizon 4. , 



