218 
PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
146a. Trophon laciniatus var. inoratus (Pilsbry). 
PI. XXXIV, Fig. 8 C . 
1897 ^ vartans v. Ihering, in: Rev. Mus. Paul., v. 2, p. 296. 
1897 ^ inornatus Pilsbry, in: Pr. Acad. Philad., p. 330, textfig. 
This form, found — at Cape Fairweather — associated with the typical 
form of T. laciniatus , is hardly anything more than a variety of the latter. 
Its external form is more or less slender, sometimes quite swollen. Sur- 
face without lamellose varices, or only with slight traces of them, smooth 
except for lines of growth. 
Height, 60 mm, diameter, 37 mm. 
Remarks : We possess individuals that show slightly developed vari- 
ces, in some parts of the shell, which fact makes it the more certain that 
it is only a variety of T. laciniatus. The upper part of the whorls has 
sometimes a distinct angulation and a distinct, but narrow, flattened 
space near the suture (var. gradata v. Ih.) ; in other cases no trace of 
this angulation is seen, the whorls being evenly convex. 
This variety much resembles some of the varieties generally classed 
with T. geversianus , especially : T. geversianus var. calva ( Kuester & 
Kobelt, 1878, p. 305, pi. 75, f. 1, and Tryon, 1880, pi. 32, f. 338), and T. 
geversianus var. varians (Tryon, pi. 32, f. 346). Some of our specimens, 
for instance, that figured by Pilsbry, which are more obese and have no 
angulation, are indistinguishable from T. varians as figured by Tryon. 
On the other hand, we have specimens that are more elongate, and the 
complete lack of spiral sculptures, as well as the fact that this form is 
found associated with T. laciniatus , is in favor of the course adopted, to 
leave it with T. laciniatus. 
The fact that T. laciniatus offers the same variations as T. geversianus 
is very interesting, and would bring these two supposed species still 
closer together. 
Record of specimens : Cape Fairweather, 11 sp. ; San Julian, Darwin 
Station, above Patagonian beds, 3 sp. 
Distribution: T. varians , mentioned by v. Ihering from Santa Rosa (or 
Punta Raza, see pp. 112, 119 and 177), between Santa Cruz and San 
Julian, and from between San Jorge and Deseado, from the Tehuelche 
beds, is no doubt this form. 
