Ortmann — Invertebrate Fossils from Patagonia. 377 



very fine lines of growth, but no trace of spiral sculpture. 

 Mouth elongated, canal short. Sinus of outer lip semicircular, 

 situated in the sutural depression, close to the suture ; at the 

 point of junction of the outer lip with the columella there is a 

 distinct nodulose, callous swelling. Height, I3 mm ; diameter, 



\.Kvs\m. 



Santa Cruz 



34. Borsonia patagonica sp. nov. Shell subfusiform, bicon- 

 ical ; whorls ca. 6, last whorl a little larger than half of the 

 shell. Whorls convex, depressed in the upper part, with a 

 slight swelling just below the suture. Depressed part smooth, 

 the rest ornamented by 10-12 longitudinal rib-like swellings, 

 which are slightly tuberculiform on the upper whorls ; on the 

 last whorl they are rib-like, but less distinct. Besides the ribs, 

 there are spiral cords on the lower part of the whorls ; they 

 are wanting on the depressed part, but continue, on the last 

 whorl, upon the canal. Mouth elongated, canal of medium 

 length. Outer lip with a moderately developed sinus, which 

 is situated in the sutural depression. Columella with two 

 plaits, the lower one sometimes quite indistinct. Height, 19 mm 

 (not complete) ; diameter, 9 mm . 



Santa Cruz. 



35. Actceon semilcevis sp. nov. Shell elongated-ovate, rather 

 slender, spire short, conical, about one-quarter of the length 

 of the shell. Whorls four, convex. Suture distinct, a slight 

 carina running close to the suture and parallel to it. Below 

 this carina there is an indistinct spiral groove. Below the 

 latter the surface of the shell is smooth ; but in the lower 

 third of the last whorl there are 5-7 spiral furrows, which are 

 rather broad, almost as broad as the flat intervals. Mouth 

 elongated, wider below, columella with a distinct fold below. 

 Height, 7 mm ; diameter, 3*5 mm . 



Mt. of Observation. 



Crustacea. 



36. Scalpellum juliense sp. nov. Only the carina known. 

 Carina narrow, elongated, strong and solid, curved; basal mar- 

 gin bluntly pointed ; surface smooth, only with lines of 

 growth. Tectum strongly arched in its upper part, only 

 slightly so in its lower ; upper part solid, its cross section almost 

 quadrangular, with a prominent ridge on the concave side, 

 formed by the junction of the inflected parietes. Parietes 

 very narrow, separated from the tectum by a distinct but blunt 

 ridge. The carina of S. solidulum Steenstr. (See Darwin, 

 Monogr. foss. Lepad., 1851, p. 12, pi. 1, f. 8) resembles so much 

 the present fossil, that I have no doubt, we have to deal here 

 with a closely allied species. 



San Julian. 



