230 



CRUSTACEA. 

 OSTRACODA. 

 Apaechites Whiteavesii, Jones. • 



Aparchiies Whiteavesii, Jones 1889. Ann. and Mag. Nat. Hist, ser. 6., 



vol. III., p. 384, pi. 17, fig. 10, and wood- 

 cuts 5 and 6 on p. 385. 



Lower Fort Garry (in the parish of St. Andrews), Dr. R. Bell, 1880 : 

 a cast of the interior of both valves. 



A " subglobular Leperditioid Ostracod, with strong dorsal angles fore 

 and aft, and a steep postero-dorsal and more gentle antero-dorsal slope, 

 the former falling into a bolder curve than the latter; and with the 

 ventral outline almost semicircular. The ventral and end margins 

 of the united valves are thick and bevelled inwards, and slightly fluted 

 there." Professor T. Rupert Jones (op. cit.). 



Apaechites paevdlus, Jones. (Sp. nov.) 



Plate 22, figs. 4, a-c. 



"The specimen figured is a,n Aparchites, and it is related to A. suh- 

 ovatus, Jones, from the Lower Silurian strata of Dufton, Westmoreland,* 

 and of Girvan, Scotland.! It has not, however, exactly the same outline 

 as any of the figured specimens, and it is decidedly more convex along 

 the median line than any of them. It is elongate-ovate in shape; smooth, 

 cream-coloured, in a soft, whitish limestone. The difference above mi^n- 

 tioned lead me to regard it as a distinct species, which I name Aparchites 

 parvulus. 



" It is too narrow and too convex for Aparchites Billingsii, Jones, \ 

 and very much smaller, being only three millimetres long by one mm. 

 and a half high." Professor Jones, in a letter to the writer, receivt.d 

 4th July, 1896. 



Little Black Island, Lake Winnipeg, D. B. Dowling and L. M. Lambe, 

 1890 : a single right valve. 



For the preceding description and the drawings reproduced on Plate 

 22 (figs. 4, a-c), the writer is indebted to Professor Jones. 



* Quarterly .Journal of the Geological Society of London, vol. XLIX. (1893), p. 292 ' 

 pi. 12, figs. 7 and 8. 



■|- Ibidem, p. 297, pi. 13, figs. 4 and 5. 



{Annals and Magazine of Natural History, Series 5, vol. VIII. (1881), p. 345 (Lepcr- 

 ditia), pi. 20, figs. 9, a-h. 



