534 PATAGONIAN EXPEDITIONS : ZOOLOGY. 



Chilina fusca Mabille. 



Chilina f/isca ]\i\ts Mabille, Bull. See. Phllomathique de Paris (7), VIII, 



1883, p. 45. 

 Acyrogonia fusca Mabille et Rochebrune, Miss. Sci. du Cap Horn, VI, 

 1889, p. 25. 



The shell is fragile, brownish-corneous, ornamented with a few brown 

 spots ; columella white, somewhat twisted, a little thickened, but without a 

 fold. Length 16 to 17, diameter 8 mm. 



Punta Arenas (Lebrun). 



This species is the type oixkit^xovi^ Acyrogonia^ described as a new genus 

 of ChilinidcB, with the following characters: "Shell thin but quite strong, 

 the general shape acutely oval, spire projecting but not very slender ; colu- 

 mella arcuate, twisted but little, without the columellar folds characteristic 

 of Chilina, and descending to the base of the aperture." 



This group is known only by the original account. Neither of the two 

 species has been figured. I do not think it generically distinct from Chilina. 

 In some species of that genus the columellar fold is reduced to an incon- 

 spicuous vestige. 



Chilina nervosa (Mabille et Rochebrune). 



Acyrogonia nervosa Jules Mabille et Rochebrune, Mission Scientifique du 

 Cap Horn, VI, Mollusques, Pt. H., p. 26 (1889). 



A more compact, ventricose species than C fusca, with the aperture 

 wider, the columella thick, arcuate, impressed in the middle and without 

 a fold. Length 16, diam. 10 mm. 



Punta Arenas, in pools (Lebrun). 



Chilina falklandica Preston. 



Chilina falklandica Preston, Annals and Magazine of Natural History 

 (8), V, January, 1910, p. in, pi. 4, fig. 2. 

 Near C amosna. Length 15, diam. 8, aperture 9.5 mm. 

 Falkland Islands. 



Chilina strebeli sp. nov. 



■ (Plate XLIV, Figs. 24-28.) 



The shell is elliptical, with a short, conic and acute spire ; rather solid. 

 Sculpture of rather coarse and unequal wrinkles along growth-lines and 



' Acyrogonia Jules Mabille et Rochebrune, Mission Scientifique du Cap Horn, VI, Mollusques, 

 p. 25, 1889. 



