PalcBOZoic Bivalved Entomostraca. 63 



4. Primitia lavigaia (Sanclberger, MS.), sp. n. 

 (PL VII. figs, 3 a, h.) 



Scaphoid in outline, with straiglit back, obliquely curved 

 ventral margin, semicircular hinder and contracted front 

 margin, sloping upwards (broken). Sulcus on the anterior 

 third, relatively large. Surface gently and uniformly convex, 

 smooth, as far as shown by the small remaining patches of 

 the test. 



This occurs, together with Aparchites reticulatus (fig. 4) , 

 in the^ little piece of thin Upper-Devonian limestone from 

 Armenia, referred to at page 61. 



5. Entomis serratostriata (Sandberger). 

 (PL VII. figs. Q>a,Q>b.) 



Length. Ileio'ht. Thickness of carapace, 



millim. millim. millim. 



1-6 -95 -6 



Ann. & Mag. Xat. Hist. ser. 6, vol. vi. 1890, p. 320 (for synonyms), 

 ph xi. tigs. 1 a, b, 2 a, b. 



The form of these little fossil valves is so often and so much 

 modified by pressure that it is difficult to define their exact 

 shape. The specimen here figured is probably as near to tlie 

 original form as any we have met with. 



It occurs (with Spirigerina reticularis? Sind Fieri nea ventri- 

 cosa ?) in a dark grey Upper- Devonian Limestone (weathcruig 

 ferruginous), from Cabieres, near Montpellier, France. 



6. BarycJdlina? semen, Sandberger, MS., sp. n. 

 (PL VII. figs. 5 a, 6(>.) 



This little oval striated valve has the aspect of beino-a near 

 relative to Entomis serratostriata, but it has no furrow, only 

 a central pit, and its superficial ornament differs in havino- 

 rows of definite meshes between the strise, some rectangular in 

 single rows, and some in double rows, with a line of angular 

 (vaudyke) junction. This ornament reminds us of tluit of 

 Entomis [Darychilina?) variostriata, Clarke (Ann. & Ma"-. 



