338 COXTRIBUTIONS TO CAXADIAN PAL,EONTOLO(iY. 



volutions transversely and are parallel to the outer lip, have a slightly 

 concave curvature above, or posteriorly, and an etiually slight but convex 

 curvature below. They are closely and very regularly disposed and so 

 S)nall as to be invisible without the aid of a lens. 



Height or length of the only specimen collected, which, as already 

 stated, is slightly imperfect anteriorly, nine millimetres and a half : max- 

 imum l^readth of the outer volution of the same, about three mm. 



DeN-ils Point, Lake Wimdpcgosis, J. B. Tyrrell, 18S9 : a single but 

 unusually well preserved mould of the exterior of the .shell, in dolomite. 

 The figure on Plate xlv is taken from a gutta percha impression <jt this 

 mould, upon which the foi'egoing description also is based. 



This species and the one previously descriljed, although encii'cled by 

 distinct spiral I'idges, are also marked with the sigmuidal costuhe or 

 growth lines parallel to the outer lip, which are so characteristic of 



LoXdIti'llHI. 



A fifth species of Loj-oh'iiki is indicated by a single and nearly perfect 

 cast of the interior of the shell, collected by Mr. Tyri'ell, in 1889, at 

 Roderick Point, Birch Island, Lake Winnipegosis. The (lutline and pro- 

 portions of this specimen are (juite unlike those of cither cjf tlie four 

 species already described or identihed, but as its surface markings are 

 entirely unknown, its spjecific relations cannot be ascertained. 



(S.) Macrociiilina subcostata, Schlotheim. (Sp.) 



Plate 44, Hys. 4 and 5. 



BuGcitiiUa anhco^latn^, .Schlotlieim. 1S20. Pctrefactenkuude, [). l.^O, pi. xii, fig^. 3. 



liuccinu'iii ivibrlcatmii, S(jwerby {parw). 18!27. Mill. Conch., vol. VI, p. 1117, pi. dlxvi, fig. 



2, riglit-hand figure. vn\y. 

 Macrocheihi.^ttrcidattn;, I*liillii).4. 1841. Pal. FtiHs. Cornvv., Dev., and W. Soniers, p. 



l.Sil, pi. 1.x, fig. 194. 

 Macrnckcilu.^ (:Iori{/f(fn^, Pliilli[>s. Il)id., p. 104, pi. xxxix, fig. 1115. 

 Mncrorlirihis ,SchliiUiii/ni, d'Atx-h'mc and de Venieiiil. 1S42. Trans. Geol. See. Lond., 



Ber. 2, vol. VI, pt. 2, p. 354, pi. xxxii, fig. 2. 

 LnX'numii FliiJIipai, F. A. Roenier. 1843. Verst. Havz., p. .3(1, pi. viii, fig. 9. 

 Loxcnintui. aprf:sf<'i('Hi, F. A. R<.)enier. I.Vji<l., ]>. 30, pi. viii, fig. 10. 

 Biicci)iiiin arcufataiii, (loldfusK (pars). 1844. Petref. (Jerni.. \ol. Ill, p. 28, p). clxxii 



fig 15b ordy. 

 il/acror/i' ?7/(.v .s'/7'0o.s^r'^/(.s-, T.schern: sciii'w. 1887. Mem. Com. (Je-ol. Kuss. vol. Ill No 



3, p. 171, pi V, figs. Oa, 1 1. 

 Miicrnchilnia siiheiistiitii . Whidlinrne. 18!)!. Mi-m. I)ev. ]''aun. S. Kugl.and, vol. I, p. 

 150, pi. xvi, figs. l-(i. 



Dawson Bay, Lake Winnipegosis, on a small island south-west of A\'hi- 

 teaves Point (one specimen), and on auotlier about three miles north of .Salt 



