282 PHOTINULA. 



distinct sutures; last whorl large, subcomplanate above, at the 

 periphery angularly rounded, not descending at the aperture, flat- 

 tened beneath, very elegantly and minutely lirate and closely 

 rad lately striate. 



Alt. 18, diam. maj. 19, min. 15 mill. (K. & M. in Bull. Soc. Phil- 

 omathique de Paris, 7th Ser., vol. 9, 1885, p. 104). 



Sta. Cruz, Patagonia. 



PHOTINIA HYADESI Rochebrune et Mabille. 



Shell covered-imperforate, orbicularly trochiform, subdiaphanous, 

 rather solid, shining, grayish flesh color, clathrulate with little 

 evident distant lirse and extremely narrow strise; spire elevated, 

 conic- pyramidal, distinctly lirate (the lirse acute, resembling carinse) ; 

 apex minute, somewhat obtuse; whorls 6, convex, irregularly (the 

 first slowly, subregularly, the remainder very rapidly) increasing ; 

 separated by a narrowly margined impressed suture ; last whorl 

 large, rounded-sloping above, at the periphery obtusely angulated, 

 planulate beneath, and ornamented with radiating strise and 3-4 

 lirse. not descending at the aperture ; aperture oblique, lunate, 

 rounded ; peristome acute ; columella deeply twisted, columellar 

 margin thickened in a white, shining, very narrow, umbilicus-con- 

 cealing callous ; outer margin slightly, basal well rounded. 



Alt. 10, diam. maj. 21, min. 14 mill. (E. & M., 1. c., p. 105.) 



Terra del Fuego. 



PHOTINULA DETECTA Rochebrune et Mabille. 



Shell imperforate, orbiculate-convex, a little thick, destitute of 

 cuticle, sub-rudely striate ; spire moderate, conical, little prominent ; 

 apex minute, subpapillar; whorls 6-7, rounded-convex, irregularly 

 (embryonic sensibly, following very rapidly, last more rapidly) 

 increasing, separated by subcanaliculate sutures ; last whorl largest, 

 rounded-sloping, obscurely angulate at the periphery, not descending 

 at the aperture ; base scarcely convex, at the umbilicus entirely 

 covered, impressed, and with 5-6 lines ; aperture oblique, transversely 

 oblong; peristome straight, acute; margins distant, joined by a 

 slightly thickened calcareous lamina; columella twisted, thick, 

 emitting a narrow callous ; outer margin well and elongately arched. 



Alt. 11, diam. maj. 24, min. 20 mill. (E. & M., 1. c., p. 105.) 



Around Sta. Cruz, Patagonia. 



