STROPHOMENA. 149 
rugosa ; and hence it is at least uncertain whether he himself did not intend the 
latter species by his name, even though Blainville’s interpretation scarcely seems to 
represent that shell. Moreover de Blainville, who first published a specific but not 
a generic description, refers toan English geniculated species of the genus, meaning 
probably St. rhomboidalis. Consequently there seems no sufficient reason for 
overthrowing Davidson’s nomenclature, which, whether it should ultimately prove 
to be strictly in accord with the laws of priority or not, is both well established 
and clear. 
In 1828 Dalman formed the genus Leptena for the three shells—Leptena 
rhomboidalis, L. euglypha, and L. transversalis. If L. rhomboidalis be reserved for 
the genus Strophomena, there seems no reason why Davidson may not be followed 
in taking L. transversalis as the type of Leptena. 
1. SrRopHomENA RHOMBOIDALIS, Wilckens, var. ANALOGA, Phillips. 
1769. ConcHITa RHOMBOIDALIS, Wilckens. Nachtricht vy. seltenen Verst., p. 77, 
pl. viii, figs, 43, 44. 
1836. Propucta anatoGa, Phillips. Geol. Yorks., vol. ii, p. 215, pl. vii, fig. 10. 
1859. SrropHomENA ruUGOSA (Phillips), Hall. Pal. N. Y., vol. iii, p. 195, pl. xix, 
figs. 1 a—y. 
1865. — RHOMBOIDALIS, var. ANALOGA, Davidson. Brit. Foss. Brach., 
vol. iii, pt. 6, p. 76, pl. xv, figs. 16—17. 
1867. = — Hall. Pal. N. Y., vol. iv, pt. 1, pp. 76 and 
414, pl. xii, figs. 16—18? and pl. 
xv, figs. 15, 16. 
1879. — —_ Barrande. Syst. Sil. Bohém., vol. v, pl. xli, 
figs. 1—38; pl. ly, fig. 3, 1,2; 
pl. xcii, figs. 1—3 a, Et. E, F. 
1887. -- “= Tschernyschew. Mém. Com. Géol., vol. iii, 
pt. iu, p. 108, pl. xiv, fig. 25. 
1887. PxiecTaMBONITES RHOMBOIDALIS, @hlert. In Fischer's Manuel Conch., 
p. 1283, fig. 1048. 
1889. — — Nicholson. Manual Paleont., vol. i, p. 
663, fig. 518. 
1892. Leprmna RHOMBOIDALIS, Hall. Pal. N. Y., vol. viii, pt. 1, p. 279, pl. viii, 
figs. 17—31; pl. xva, figs. 40—42 ; and 
pl. xx, figs. 21—25. 
Localities —From Lummaton fifteen specimens are in my Collection, and eight 
in the Woodwardian Museum. From Wolborough there are eight fine typical and 
similar specimens in Mr. Vicary’s Collection, one in the Museum of Practical 
Geology, and one in the British Museum. 
Remarks.—Unlike St. nodulosa, the rugee on young specimens are as prominent 
