44 Messrs. Jones and Kirkby on Carboniferous Entomostraceu 



("Arenaceous shale," Local, p. 100). Dark, fragile, slightly 

 micaceous shale, with Crinoids, Modiola (?), &c., and containing 

 obscure valves and casts of Leperditia subrecta (?) and Kirkbya 

 annedens, but nothing exactly corresponding to the figure. Prof. 

 M^Coy suggests that this " is perhaps Cypris Scotoburdigalensis 

 of Hibbert ; but this dwarf form of L. Okeni, smaller even than 

 the variety subrecta, would hardly match " C. Hibberiii," which 

 is stated to be " frequently upwards of a line in length," and 

 " the largest species of Cythere of the Irish palaeozoic rocks " 

 (though " C. inflata" is said to reach 2 lines in length), except 

 when regarded as one of the modifications of L. Okeni, which 

 we believe to be the correct view of its relationship, though not 

 contemplated in the work before us. 



. IS. " Cythere impressa. Yellow Sandstone; Dromard, Drapers- 

 town. Synops. p. 166, pi. 23. fig. 16; Local, p. 48 ("Are- 

 naceous shale," Local, p. 100). Grey, fine-grained, micaceous, 

 hardish shale, with Modiola (?) and Serpula. Some obscure 

 casts of Leperditia subrecta and of other Entomostraca are pre- 

 sent; but there is nothing exactly like the figure, which is 

 stated to represent a form about half a line long, and " very 

 common in the slates and shales of several districts "( p. 166). 



14. "Cythere inflata. Lower Carboniferous Limestone; 

 Bally duf, Dungarvon, co. Waterford." Synops. p. 167, pi. 23. 

 fig. 17; Local, p. 68. Grey crystalline shelly limestone, veined. 

 Without any visible specimen of Entomostraca. 



14*. White crystalline limestone, from Laracor, Trim, co. 

 Meath (Local, p. 68). This has a small Entomoconchus and a 

 minute hollow mould where a Leperditia subrecta has probably 

 been. The figure may have been taken from a small Entomo- 

 conchus, a Cypridella, or other nearly related Cypridine Ento- 

 mostracon. 



. Prof. M'Coy states that his " C. infl,ata " is the " largest and 

 most abundant " of the Carboniferous Cytheres (from 1 to 2 lines 

 in length), and that it abounds in the dark foetid limestones, 

 but is " rare in the light-coloured limestone, where C. inornata 

 supplies its place." 



15. "Cythere inornata. Yellow Sandstone; Cultra, Holy- 

 wood." Synops. p. 167, pi. 23. fig. 18; Local, p. 48 ("Are- 

 naceous shale," Local, p. 100). Bluish-grey fissile shale, fine- 

 grained and micaceous, with numerous casts and broken valves 

 (?V to tV iiich long) of Leperditia subrecta and L. Scotoburdi- 

 galensis, sometimes showing the eye-spot. Prof. M'Coy states 

 that his " C. inornata " is rarely ^ line in length, and that it is 

 *' very common in several localities.^' 



The Permian Cythere referred by one of us to C. inornata, 

 M'Coy, is decidedly not the same as this, which is the common 

 dwarf variety of Leperditia Okeni, Miinster, sp. 



