THE NAUTILUS. 91 



Alabama and Louisiana. Specimens from Kentucky (Bowling 

 Green, collected by Miss Price) are slightly different in shape, 

 being more rhomboid, but probably range with contracta. 



3. C. hodgsonii n. Somewhat like contracta, but rather larger, 

 somewhat more elongated ; the shell is thicker, the nacre whitish, 

 the hinge stronger ; the posterior end is not so markedly or so ob- 

 liquely truncated. The surface is rather dull, the color a vivid yel- 

 low, to plumbeous around the umbones, in older specimsns. It has 

 some resemblance with C. transversa^ but is less elongated, more 

 equipartite, the shell and hinge are stouter, the superior margin and 

 the hinge more curved, especially so the posterior lateral teeth. 



Size: long. 14, alt. 11. diam. 6.5 mill. 



From a mill pond at Albion, 111., collected years ago by Mr. C. S. 

 Hodgson. It is in many collections under various names, e. g., 

 Sphaerium aureum Pr., from which it is very different. So well 

 marked a form must be described and named, even if known from 

 only one place, so far, and even if it should ultimately prove to be a 

 variety, e. g., of C. contracta, which, however, is not probable. I 

 take pleasure in naming it after its discoverer, Mr. Hodgson. 



4. G. transversa Say. Widely distributed and common in all 

 kinds of waters. Fairly constant in shape, but rather variable as to 

 size and color. 



5. C. fem'ssii n. sp. Shell elongated, equipartite, rather well in- 

 flated, beaks in the middle, narrow, moderately prominent, somewhat 

 inclined forward, slightly or not calyculate ; superior margin curved, 

 sloping from the beaks anteriorly and posteriorly ; scutum and scu- 

 tellum slight but distinct, long and narrow ; inferior margin well and 

 regularly curved ; anterior and posterior part rounded, without any 

 angles, the former somewhat less high ; surface with some irregular, 

 not sharp, but partly rather deep strias, more or less arranged in 

 zones, polished ; color plumbeous around the beaks, with broad light 

 yellow zones along the margins; shell thin, hinge fine, plate quite 

 narrow, teeth thin and slight, the laterals placed at angles with the 

 longitudinal axis, rather long ; ligament fine and very long. 



Size: long. 13, alt. 10, diam. 7 mill. 



Hab.: Oklahoma City, Oklahoma, Arkansas, Frierson, Louisiana; 

 in the former States collected by Mr. Jas. H. Ferriss, in whose honor 

 the species is named, in the latter by Mr. L. S. Frierson. 



So far as known, the present Calyculina is decidedly distinct, and 



