446 MAZATLAN UNIVALVES 



Hob. Panama ; 8 sp. under stones, sponges, marine plants, 

 &c. near low water mark ; C. B. Adams. Mazatlan ; 20 sp. 

 off Chama and Spondylus ; L'pool Col. 

 Tablet 2035 contains the smaUest and the largest specimens. 



FAMILY SCALAHIADJE. 

 GENUS SCALAEIA, Lam. 



Phil. Handb. Conch, p. 178. 



Scala, (KtemJ H. $ A. Ad. Gen. vol. i. p. 220. 



Clathrus, Oken, Lehrb. p. 257, 1815. 



Cyclostoma, Schum. (teste H. fy A. Ad.) non Lam. 



564. SCALAEIA HEXAGONA, Sow. 



Proc. Zool. Soc. 1844, p. 29 -TJies. Conch, p. 98, no. 60, pi. 33, 

 f. 67. C. B. Ad. Pan. Shells, p. 197, no. 285. 



Clathrus (Scalaria) hexagona, H. fy A. Ad. Gen. i. 222. 

 Known by the six curves of continuous varices which ascend 



the spire in spiral lines. Long. '62, long. spir. '44, lat. *28, 



dfo.m 



Sab. Acapulco, Col Moffat Panama ; 1 sp. C. B. Adams. 



Mazatlan ; 2 sp. ; L'pool Col. 

 Tablet 2036 contains 1 specimen. 



565. SCALAEIA SUPEASTEIATA, n. s. 



S. t. turrita, graciliore, compactd ; anfr. normalibus vii. 

 attingentibus, rotundatis ; costis xii. acutis, vix superne pro- 

 ductis, lineis rectis, marginem alterum spirts paralleUs, ascen- 

 dentibus ; anfr. primis spiraliter tenuissime striatis, adultis 

 l&vibus ; umbilico nullo. 



Differs from S. mitraeformis and its congeners in being 

 broader, with the whirls not touching, and the shoulder-pro- 

 jections very slight. Only one nearly perfect, and two young 

 dead specimens, probably conspecific, were found. Long. '43, 

 long. spir. '27, lat. '25, div. 40. 

 Sab. Mazatlan ; extremely rare ; L'pool Col. 



Tablet 2037 contains the larger specimen. 



