4A6 MAZATLAN UNIVALVES 
fab.—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 smallest and the largest specimens. 
Famity SCALARIADA. 
Genus SCALARIA, Lam. 
Phil. Handb. Conch. p. 178. 
Seala, (Klein,) H. & A. Ad. Gen. vol. i. p. 220. 
Clathrus, Oken, Lehrb. p. 257, 1815. 
Cyclostoma, Schum. (teste H. & A. Ad.) wem Lam. / 297 
564. SCALARIA HEXAGONA, Sow. 
Proc. Zool. Soc. 1844, p. 29 :— Thes. Conch. p. 98, no. 60, pl. 33, 
f. 67.—C. B. Ad. Pan. Shells, p. 197, no. 285. 
Clathrus (Scalaria) hexagona, H. & A. Ad. Gn. 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°. 
Hab.—Acapuleo, Col. Moffat.— Panama; 1 sp. C. B. Adams.— 
Mazatlan ; 2 sp.; Z’pool Col. 
Tablet 2036 contains 1 specimen. 
565. SCALARIA SUPRASTRIATA, 2. 8. 
S. t. turrita, graciliore, compacta ; anfr. normalibus vii. 
attingentibus, rotundatis ; costis xil. acutis, vix superne pro- 
ductis, lineis rectis, marginem alterum spire parallelis, ascen- 
dentibus ; anfr. primis spiraliter tenuissime striatis, adultis 
levibus ; umbilico nullo. 
Differs from S. mitreformis 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°. 
Hab.— Mazatlan ; extremely rare; L’pool Coé. 
Tablet 2037 contains the larger specimen. 
