334 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



The distinguishing features of this species, as compared with those of 

 X. Mauifohenaif:, are the shorter and more conical spire of the former, its 

 obliquely expanding outer volution and different surface markings. 



LoxoNEMA, Phillips. 



The most typical species of Loxoneina, as described by Phillips and 

 others, are no doubt those whose surface is marked by sigmoidally arched 

 costuls' or crowded growth lines, parallel to the outer lip. Still, the fact 

 that Phillips himself, on page 139 of his " Palieozoic Fossils of Cornwall, 

 Devon and West Somerset," included in that genus his own L. retii:.ulatuiii, 

 whose whole surface is stated to be " reticulated ))y raised longitudinal 

 and spiral threads," evidently shows that he intended the original 

 diagnosis of the genus to be enlarged so as to include those species which 

 are marked also with spiral ridges or keels. The few species collected by 

 Messrs. Tyrrell and Dowling may therefore be arranged in two grcjups, 

 as follows. 



A. Typical and non-reticulate species, whose surface is either marked 

 only with sigmoidal costuhe, or growth lines, parallel to the outer lip, or 

 nearly smooth. 



LoXONEMA ALTIVOLVIS. (N. Sp.) 

 Plate 45, figs, 8 and 9. 



Shell rather large, elongate, subulate : volutions compressed laterally, but 

 slightly convex in the middle, the later ones of the spire about as high as 

 broad, the earlier ones unknown : outer volution considerably higher or 

 longer, but appjarently not very much broader than the one which immedi- 

 ately precedes it ; suture indistinctly defined and devoid of band in the few 

 specimens upon which the test is preserved, but deeply channeled in casts 

 f)f the interior • aperture subovate, higher than broad, attenuate above 

 and narrowly rounded below. 



Surface finely costulate and marked with closely and regularly dis- 

 posed, slightly flexuous and .siriiple raised lines, which cross the volu- 

 tions transversely. Upon the later vijlutions of the spire and upon the 

 upper and central poi-tion of the outer volution, these raised lines are 

 nearly straight or faintly concave, but on the base of the outer volution 

 they curve convexly and rather aljruptly backward. 



A few imperfect casts of the inteiior of .shells of this species, some 

 with small pieces of the test adhering to them, were collected by Mr. 

 Dowling, in 1888, on the south-west shore of Dawson Bay, at two small 

 points, one half a mile and the other three miles north of the mouth of 

 Bell River. Similar specimens, some a little more perfect and others 



