THE NAUTILUS. 



80 



rather fine axial threads, becoming finer behind the aperture ; suture 



narrowly canaliculate, its lower edge finely denticulate; last whorl 



decidedly solute, free about one-fifth of its length ; 



aperture almost regularly oval, vertical when viewed 



from its outer edge, oblique when viewed from the 



front; outer lip heavy, rounded and well reflexed; 



inner lip narrov/er, scarcely reflexed above; base 



within the umbilical reg'on with faint spiral lira?; 



color brownish white, marked with brown spots 



arranged in longitudinal and revolving series. 



Operculum paucispiral, finely ridged, calcareous 

 without, horny within ; nucleus exeentric. 



Length 25, greatest diameter 14, least diameter 

 11 mm. Length of aperture 10, diameter 7 mm. 



Another shell. Length 21, greatest diameter 13, least diameter 

 7 mm. Length of aperture 9, diameter G mm. 



Found on a high limestone hill back of Thomazeau, Haiti, many 

 specimens, living and dead. 



This species is somewhat closely related to Chondropoma wein- 

 landi Pft iffer, which is found on the plain about Thomazeau, but it 

 is larger, solider, more finely developed and painted, and has the 

 last whorl much more solute and the outer lip more solid and 

 reflexed. It varies a good deal in size and color pattern. There 

 are occasionally faint longitudinal brown bands, and the darker 

 spots which are usually longest in a spiral direction may become 

 angular, rounded or almost blunted into axial rows. 



C 7 



It is a magnificent species, often quite as beautiful as C. magnificum. 



SOME NOTES ON THE NORTH AMERICAN CALYCULINJE, WITH NEW 



SPECIES. 



BY DK. V. STERKI. 



The genus Calyculina has been pointed out by T. Prime 1 without 

 a name, and named by Clessin. 2 It seems well-defined, since no 

 species have been seen which were in doubt whether to be ranged 

 under Sphrerium or Calyculina. 



1 Mon. Corbiculidae, 1865, p, iv. 



2 MaLBl. xix., 1870, p. 150, and used in "Cycladeen," p. 253. 



