THE NAUTILUS. 93 



10. G. securis Pr. Widely distributed, common, and quite vari- 

 able in size, shape, surface sculpture and color. Tlie shell is more 

 or less inflated ; the beaks are more or less prominent, broader or 

 narrower, often not calyculate, but simply rounded; the posterior end 

 is more or less truncate, the disproportion between the anterior and 

 posterior parts various ; the surface of the shell is usually dull or even 

 rough from fine scales of the epiconch, but sometimes smooth or even 

 glassy. The color varies from brown to a vivid yellow or orange 

 (crocea Lewis). 



11. C. sphcerica Anth. I have seen no authentic specimens and 

 no Calyculinse from the original place, and consequently am unable 

 to judge about it. It appears to be very near securis, also from some 

 Michigan specimens received as spharica. 



12. G. rykolti Normand. From Traverse City and from Straits 

 Lake, Michigan, Mr. Bryant Walker lias sent specimens of a Caly- 

 culina, which so closely resemble C. rykolti from Germany and 

 Sweden that they can hardly be regarded as distinct. More materi- 

 als may bring additional evidence. 



Larger specimens (of the size given as typical by Clessin) from 

 Saguache, Colorado, were in the collection of the late Dr. James 

 Lewis, now in possession of Mr. Bryant Walker. The agree with G. 

 rykolti, but must also be compared with the following : 



13. C. raymondi Cooper. The specimens I have from Washing- 

 ton (Spokane, Mrs. Olney, and Seattle, Mr. Randolph), are evidently 

 not mature. They have much resemblance with C. rykolti, and it 

 would be of special interest to know whether such forms also inhabit 

 eastern Asia. 



14. G. deformis Carpenter. My specimens are from Rhode Island 

 and New Jersey, not authentic but probably true. Whether this 

 Calyculina is a good species, or a form of securis, as has been as- 

 serted, I am unable to decide, for the present. At any rate, it is a 

 remarkable form, seems to be distinct. 



15. C. lacttstn's Mull. (?). To Mrs. M. Olney I am indebted for 

 a few specimens from the Spokane river, Washington, which can in no 

 way be distinguished from C. lacustris, from several European coun- 

 tries. They appear absolutely identical. More specimens from other 

 places would be very welcome. 



Of G. subfranversa Pr., lenticula GUI., and tenue Pr., I have no 

 materials. Under the first name, G. transversa from Texas have been 

 sent out. 



