176 DR G. W. LEE ON 



Loxonema cf. anglicum d'Orbigny. 

 Phillips, Palaeozoic Fossils of Cornwall, 1841, fig. 188. 



Four specimens, very small and fragmentary, must be placed in the group of 

 Loxonema rugiferum (Phillips), but the whorls are higher than in this species, thus 

 pointing to closer affinities to Loxonema anglicum d'Orbigny. Another character 

 they appear to have in common with it, is that the ribs are continuously uniform in 

 size, showing no tendency to become evanescent in their upper part. This latter 

 feature has already been pointed out by the Rev. G. F. Whidborne.* 



The name Loxonema anglicum was given by d'Orbigny t to a Devonian species 

 which Phillips had described in 1841 (loc. cit.) as a Devonian representative of his 

 Carboniferous Melania rugifera, from which it differs in the characters indicated. 



The materials are too fragmentary to determine whether they really belong to the 

 Devonian species, which has, however, already been recorded from Carboniferous rocks, 

 the name fio-uring in Struve's list of Carboniferous fossils from the Moscow basin. 



o 



Loxonema sp. b. (PL II. fig. 43.) 



The largest of three fragments is composed of four whorls measuring 3 '5 mm. in 

 length. The ornamentation consists of straight, sharp equidistant costse, more numerous 

 on the younger whorls than on the later ones, and belongs to the type exhibited in 

 Loxonema strigillatum de Koninck (loc. cit., 1881, pi. vi. fig. 22) and in Loxonema 

 wisherse Krotow.J But the Nowaja Semlja shell differs from these in having the whorls 

 less convex and a more shallow suture. In shape it resembles Loxonema semicostatum 

 Meek and Worthen ; § but in the latter the costse increase in number in the older part 

 of the shell, whilst in this case it is the reverse. 



Loxonema? sp. c. (PL II. fig. 49.) 



A nearly complete specimen, measuring 5*5 mm. in length and If mm. across the 

 body-whorl, has doubtful generic affinities, since it is bucciniform, with a large body- 

 wborl t and an apparently twisted columella, as in certain species of Macrocheilina, but 

 the ornamentation is like that of a Loxonema. Since the state of preservation is such 

 as to preclude the possibility of determining whether the columella was callous or not, 

 its true generic position must remain doubtful. 



The first two whorls are unornamented ; the third and the fourth have a few broad 

 transverse folds, whilst the ornamentation of the body-whorl is totally different, consist- 

 ing of straight raised lines, closely set and very numerous. 



* A Monograph of the Devonian Fauna of the South of England, Pal. Soc, 1896, vol. iii. p. 43. 

 t I' rod nunc tic I'tili'ttiitoloyie, vol. i., 1850, p. 62. 

 I Mem. Com. G4ol. Russie, vol. vi., 1888, pi. i. fig. i. 

 § Geol. Survey Illinois, vol. v., pi. xxix. fig. 2. 



