VOLA DUTEUGEI. 61 



Vola Syriaca Coxrad sp. 



Plate v., Bgs. 4 a-c. 



Janira St/riaca Conrad, Official Report, p. 230, App., PL i, Cg. G. 



A single specimen, in so much better condition than Conrad's type, that 

 it is here figured anew. The specimen is ahnost absohitely perfect, except 

 for the loss of the posterior ear, and of part of the other. It shows that 

 what, in his excellent description, Conrad calls " wrinkles " upon the ribs, 

 are more correctly thin erect scales of small height, and that upon the con- 

 cave or left valve they run more or less obliquely across the ribs and the 

 intervals between the ribs. On the convex or right valve the scales cross 

 the ribs at right angles with their length, but are hardly perceptible in the 

 interspaces. In each of the five spaces between the six larger ribs which 

 characterize the right valve are four smaller ribs, of which the two middle 

 ones exceed the outer in size. Coll. Bird. 



Locality and Position. — Conrad's type was found at Abeih, whence this 

 probably came. Related species are found in the zone of Ammonites Syri- 

 acus, and this may be from the same horizon. 



Vola tricostata Coquand sp. 



Janira tricostata Coquand (iiou Baylk), 1S62, Geol. et Paleont. de Constantine, p. 219, PI. xiii, figs. 3, 4. 

 " " Laktet, 1S75, Expl. Geol. de la Ucr Morte, p. 1.36, PI. xi, fig. 16. 



A lower (right) valve, incomplete, but showing well the characteristic 

 features of the species ; viz. six principal radiating ribs, the intervals of 

 which contain each three unequal intermediate ribs, the median rib being 

 always stronger than the other two. Coll. Thomson. 



Locallt// and Position. — Beirut district. Fraas knew the species from 

 Muktarah in the same district, and refers it to the zone of Ammonites 

 Syriacus. Coquand assigns it, in Algeria, to les assises rhotomagiennes. 



Vola Dutrugei Coquand sp. 



Janira Dutrugei Coquanb, 1862, Geol. ct Paleont. de Consfantiuc, p. 219, PI. xiii, figs. 1, 2. 

 " L.iKTET, 1875, Expl. G^ol. de la Mer Morte, p. 137, PI. xi, fig. 18. 



An imperfect lower (right) valve, which exhibits fairly the proportions 

 and arrangements of the ribs characteristic of the species. Coll. Thomson. 



