ACM^A. 27 



A. STRIGATELLA Carpenter. PI. 7, figs. 83, 84, 85. 



The shell is ovate, a little wider behind, elevated ; apex at the 

 front fourth of the length. Young with excessively fine dose radiat- 

 ing strict crossed by growth -lines, largely worn off in adult specimens. 

 Apex very acute in young, eroded, dark brown and polished in old 

 shells. Coloration : Marked with irregular, forking black stripes on 

 a white ground, interspersed around the apex when not eroded, with 

 dots and small narrow or needle-shaped white streaks. Inside bluish- 

 white, with the central area indistinctly irregularly clouded with 

 brown. Border wide, vividly tessellated with blackish-brown. 



Length 19, breadth 14, alt. 7 mill. 



Cape St. Lucas, L. California. 



A. strigatella CPR., Ann. Mag. N. H. 3d. Ser. xiii, p. 474. A. 

 strigillata CPR., Suppl. Rep. 1863, p. 618. Collisella strigatella 

 DALL, Araer. Journ. Conch, vi, p. 253. 



The figures and description are from a type in the Smithsonian 

 Institution collection. The A.filosa of Carpenter of which I have 

 seen the type, seems to be a variety of this, differing in sculpture and 

 the more depressed form. The Carpenterian specimen of strigatella 

 in the Philadelphia collection has the radiating stripes less regular, 

 more anastomosing. 



A. FILOSA Carpenter. PL 7, figs. 80, 81, 82. 



Similar to A. mesoleuca in form and texture ; but sculpture much 

 more delicate ; young shell smooth ; then with delicate acute lirulse, 

 scarcely granulose, very distant, sometimes obsolete; interstices 

 wide, smooth; thin, flat. Oval, subdiaphanous, blackish-brown 

 radiately strigate or variously maculated with corneous. Inside 

 livid or whitish, the colors of the outside showing through ; border 

 broad, acute. Length '7, breadth '56, alt. '12 inch. (Qpr.) 



Panama. 



Lottia f patina C. B. AD., Cat. Panam. Sh. no. 367. Acmcea (f 

 floccata, var^filosa CPR., P. Z. S. 1865, p. 276. 



In shape and texture, but not in color or sculpture, these shells 

 resemble A.fascicularis ; in the latter respects, A. strigatella. ( Cpr.) 



I have examined the type of this species. It has much the 

 appearance of A. strigatella, but differs in sculpture, having the liru- 

 lse very delicate and more widely separated. It measures, length 

 171, breadth 14, alt. 2i mill. 



