60 Prof. T. E. Jones on the 



1. Beyrichia siricttsulcata, Sandberger, MS. 



2. {Bollia) ohliqua, Sandb. MS., corrected in 1890 



to devom'ca, Jones. 



3. [Strepula) annulata, Sandb. MS. 



4. Primitia sacculus, Sandb. MS. 



Dr. F. von Sandberger some time since favoured me with 

 either specimens or drawings of these and some other Devonian 

 forms, namely : — 



5. Bollia vart'ans, Sandberger, MS. Dillenburg. 



6. Drepanella serotina, Sandb. MS. Dillenburg. 



7. Entomis niticla (F. A. Roemer). Altenau, Harz. 



8. ■ ? semen, Sandb. MS. Briinn, Moravia. 



9. serratostriata (Sandb.). Cabri^res, France. 



10. ? fet'i'^/a^a, Sandb. MS. Armenia, 



11. AparcMtes reticulatus, sp. n. Armenia. 



II. Description of the Species. 



1. Aparchites reticulatus, sp. n. 

 (PI. VII. figs. A a, Ah, A c.) 



Length. Height. Thickness of carapace, 



niillim. niillim. millim. 



1-1 -65 -5 



Somewhat scaphoid and leperditioid in shape, but without 

 distinct dorsal angles, and thicker at the smaller than at the 

 other end *. This has evidently alliances with the Lower- 

 Silurian Aparchites mutus, Jones [Cytheropsis concinnal, 

 Jones, Ann. & Mag. Nat. Hist. ser. 3, vol. i. 1858, p. 254, 

 pi. ix. fig. 3 ; Primitia muta, Jones and Holl, op. cit. vol. xvi. 

 1865, p. 425 ; Aparchites mutus, Jones, op. cit. ser. 6, vol. iii. 

 1889, p. 385), with the Devonian A. mitis, Jones (Contrib. 

 Canad. Micropal., Part III., 1891, p. 91, pi. xi. fig. 15) ; and 

 with the Upper-Silurian Aparchites concinnus, Jones [Cythe- 

 ropsis, Ann. & Mag. Nat. Hist. ser. 3, vol. i. 1858, p. 249, 

 pi. X. figs. 3, 4 ; Primitia, op. cit. vol. xvi. 1865, p. 424, 

 collated with P.minuta-\ (Eichwald), Quart. Journ. Geol. 

 Soc. vol. xlvi. 1890, p. 7, pi. iii. figs 18-23). 



* The greater convexity at the higher end of the valve is an unusual 

 feature. It occurs in Primitia scitula, Jones, and in Bythocypris indian- 

 ensis, Uirich. The lower and more compressed end of the carapace is the 

 anterior end in most of the Ostracoda; but the above-mentioned species 

 and others seem to be exceptions to this rule. _ 



t Such of these individuals as have a slight mid-dorsal depression 

 belong to E. O. Ulrich's new genus Leper dii\i\ella (' Lower-Silurian 

 Ostracoda of Minnesota,' 1894, p. 636). A good account of Aparchites is 

 given at p. 643 of this memoir. 



