150 



I'liOVKKDINGH OF THE NATIONAL MUSEUM. 



vol.. .XXXI. 



Measurements of Holospira ( Ccdostemnta) dallL 



HOLOSPIRA (CCELOSTEMMA) HERRERy^, new species. 



Plate IV, tig. 14. 



Shell rather large, hroadly clul) shaped, l)lLtish flesh colored. Nuclear 

 whorls one and one-half, mhuitely granulose, light 

 horn 3'ellow. Terminal cone short, increasing very 

 rapidl}^ in width. The first two whorls succeeding 

 the nucleus light brown, the rest bluish white. The 

 greatest diameter of the shell coincides with about 

 the tenth whorl, from this the spire tapers very 

 gradually anteriorly to the penultimate turn. The 

 first two or three turns are marked by quite regu- 

 lar, oblique riblets, but these soon giv^e way to 

 mere irregularly developed lines of growth on the 

 succeeding volutions. The whorls of the terminal 

 cone are well rounded, while those of the c} lindrical 

 portion of the spire are almost flattened. Sutures 

 weak, appearing as lightly impressed lines. On 

 the penultimate whorl the lines of growth become 

 stronger, forming poorl}^ defined rif)lets. Peri- 

 phery of the penultimate whorl decidedly angu- 

 lated. Base of the last whorl short, brown, min- 

 utely punctm'ed in the type (deeply rimate in the second specimen) 

 crossed by the riblets, which are much better developed here than on the 



Fig. 10. — Interior view 

 of holosi'ira herre- 



