44(6 MAZATLAN TTNIVALVES 



Sab. — Panama ; 8 sp. under stones, sponges, marine plants, 

 &G. near low water mark ; C. B. Adams.— M.&za.i\&n. ; 20 sp. 

 oj0r Chama and Spondylus ; I! pool Col. 



Tablet 2035 contains the smallest and the largest specunens. 



Family SCALAEIAD^. 



Genus SCALAEIA, Lam. 



Phil. Randb. Conch, p. 178. 



Scala, (Klein,) K. ^ A. Ad. Gen. vol. i. p. 220. 



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



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



564. Scalaeia hexagona. Sow. 



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



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

 Clathrus (Scalaria) hexagona, JS. Sf 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, 

 div. 30". 



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

 Mazatlan ; 2 sp. ; IJpool Col. 



Tablet 2036 contains 1 specimen. 



565. Scalaeia supbasteiata, n. s. 



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

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

 ductis, lineis rectis, marginem alferum spirce parallelis, ascen- 

 dentibus ; anfr. primis S2nraliter tenuissime striatis, adultis 

 IcBvibus ; umbilico nullo. 



Differs from S. mitrjeformis 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. '4;i, 

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

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



Tablet 2037 contains the larger specimen. 



