Palipozoic Divahtd Entomostraca. 01 



The fovc^^oiiif^ liavc a smootli surface, as is usual with tliis 

 genus ; whereas the specimen under notice has a niinutely 

 reticulate ornament. It occurs witli Primitia Icnvigafa (fi ^ '.)) 

 in a micaceous and calcareous shale, thin, hard, brittle, and 

 brownish, from the Ariiatschai Valley in Armenia; collected 

 by l)r. Cr. Hievens during a journey in the Caucasus (see 

 Dr. Fr. V. kSandbero-er's note in the * Neucs Jahrb. f. Min.,' 

 &c., 187.'}, p. 58), where these and probably other s|jecies are 

 associated with Spirtfer calcnnttus, J. Sow. { = Sp. Verneuili^ 

 !Murchison), and Il/ii/nchonel/a cuhoides. 



Tiie reticulation much resembles that of Bijthocrjprisf 

 f'lvulosa, Jones, Americ. Geol., December 1889, p. 3o8, 

 tigs. 1 and 2. The latter is figured with its convex border 

 upwards, and is more oblique and much narrower. 



2. Primitia munduhiy Jones, var. sacculns. nov. 

 iSandberger, MS. (PI. Vll. fig. 7.)' 



Lenorth. Heiprht. 



iniilim. uiillim. 



•8 -5 



Beijrichia miinrhihi, Jones, Ann. & Mag'. Nat. Hist. ser. 2, vol. xvi. 



18."),",, pp.90 and 174, pi. v. ^g. 23, and pi. vi. iig. 26 ("simplex, 



var."), and tigs. 2S-31. 

 iVimitid muiidiila, Jones and PIoll, ibid, ser. .3, vol. xvi. 180o, p. 419. 

 Priinifia itiio7ffii/(i, Jones, I'locecd. Geol. Assoc, "Palaeoz. Biv. Entoni. " 



l8ti'J, pp. 8, 10, and 13, figs. i. and ii. 

 Prim if ia mnmlula, Jones, Ann. & Mag. Nat. Hist, ser. 0, vol. iii. 18G9 



pp. 37.J and .•{78, pi. xvi. ^^a. 1 and 2, 4-9, pi, xvii. fig. 1, and wood- 

 cut, fig. 2, p. 370. 

 Primitia mnmhila, Jones, Americ. Geologist, December 1889, p. 337. 

 Primitia mnndida, var., Jones, Quart. Journ. Geol. Soc. vol, xlvi. 



IHW, p. '), ])]. iv. fig. 7. 

 Primitia mundiila and varieties, Jones, Contrib. Canad. Micropaloeont 



Part III., 1801, p. 64, pi. x. figs. 8 and 9, and p. 72. 

 Primitia mimdula, Krause, Zeitsch. Deuti^cb, geol. Gesell. vol. xliii. 



1801, p. 405, pi. XXX. ]^gs. 5-7. 

 Primitia mumlula and varieties, Jones, Quart. Journ. Geol. Soc. 



vol. xlix. 1803, pp. 201 and 290, pi. xii. figs. 2 0, and pi. xiii 



figs. 11-1.5. 



This hollow cast of the right-hand valve of Primitia is 

 rather more oval than the typical form (see Ann. &Mag. Nat. 

 Hist. ser. 6, vol. iii. p. 370, woodcut, fig. 2, and pi. xvi. 

 fig. 9). Among the many varieties that have been noticed, 

 modifications in the outline of the valves and in the dimen- 

 sions of the sulcus are frequent. In this instance the sub- 

 oblong valve (its edges seem to be fully represented in the 

 intaglio cast) has the ends not quite equal in curvature, but 

 more so than in the type-form ; and the sulcus stretches 



