MACROCYCLIS. 



57 



face striated ; concave margin smooth, with a median pro- 

 jection. 



Lingual membrane with — rows of 23 — 1 — 23 teeth ; centrals 

 long, slender, pointed ; laterals none ; uncini in a curved, trans- 



Fi?. 06. 



Lingual dentition of Macroeyclis concava. 



verse row, long, slender, those nearest the edge very much 

 smaller and thorn-shaped. 



The animal has been described and figured on p. 53. 



MacrocycUa 

 sportella. 



Macrocyclis sportella, Gould.— Shell much depressed, convex 

 above, concave beneath, sloping into a broad, tnnnel-shaped umbilicus ; 

 surface delicate aud shining, of a pale, yellowish-green color, regularly 

 sculptured with sharp, coarse strise of growth, which are 

 crossed by fine, crowded, revolving lines, which usually 

 cut merely the summits of the radiating ridges, so that, to 

 the naked eye, the surface appears but minutely granu- 

 lated, but under a magnifier the raised spaces are seen to 

 be well-defined squares ; whirls five, separated by a deep 

 suture, the outer one proportionally large ; aperture nearly 

 circular, a little angular at base, modified by the preceding whirl ; peri- 

 stome acute, simple. Greater diam. 12, height 6 mill. 



Helix sportella, Gould, Proc. Bost. Soo. Nat. Hist. II, 167 (1846) ; Moll. 



Ex. Ex. 37, f. 42 (1852) ; T. M. II, 211, pi. xxii, a, f. 1.— W. G. 



BiNNET, Terr. Moll. IV, 19.— Pfeiffeb, Men. Hel. Viv. I, 111.— 



Bland, Ann. N. Y. Lye. VII, 366 ; VIII, 165. 

 Macrocyclis sportella, Teyon, Am. Journ. Conch. II, 245, pi. iii, f. 7 (1866). 



From San Diego to Paget Sound. 



