510 MAZATLAN UNIVALVES 



serrantibus ; aperturd subelongatd ; labro intus viii.-dentyto ; 

 labioparum extante, secundum strias spirales ad basin indentato. 



This species is described from young shells and fragments 

 of adults. Portions of about a dozen specimens were found. 

 The sculpture more resembles Metula, but the mouth is 

 Anachoid. The ribs are not distinctly marked, except in the 

 young shell ; but undulate, with the interstices as in Pisania. 

 The length of the adult is not known ; lat. '13, long, apert. *1, 

 div. 40. 

 Hal. Mazatlan ; extremely rare, off Spondylus ; L'pool Col. 



Tablet 2428 contains 3 young shells and rragments. 



651. ANACHIS PYGM^EA, Sow. 



Columbella pygmsca, Sow. Proc. Zool. Soc. 1832, p. 119 : TJies. 



Condi, p. 141, no. 89, pi. 40, f. 163. Mull. Syn. Nov. Test. 



Viv. p. 90. Chenu, Conch. III. pi. 25, f. 1, 2. C. JB. Ad. 



Pan. Shells, p. 97, no. 100. 



(Columbella) Anachis pygmsea, H. fy A. Ad. Gen. i. 184. 

 Comp. Columbella costulata, C. B. Ad. Contr. Conch no. 4, 



p. 58, (Jamaica.) [=A. pygmsea, var. Panama, Bridges J] 



This shell is like a minute A. costellata, but there is scarcely 

 any spiral sculpture except in the young shell, and round the 

 b ase in the adult where it is very strong. The colour varies 

 from light horn with a few purple-brown patches, to a nearly 

 uniform black brown. The labrum has about 6 teeth ; the 

 labium wrinkled by the basal striae. The first four whirls are 

 smooth and transparent, after which the normal sculpture 

 appears. The ribs are well marked, but the interstices are 

 not deeply chiseled. The smallest (nuclear) shell measures 

 *03 by '022; the largest, long. '25, long. spir. "13, lat. "11, 

 div. 40. 

 Hob. St. Elena ; on dead shells, in sandy mud, 10 fm. ; Cum- 



ing. Panama ; common under stones at low water mark ; 



C. B. Adams. Mazatlan ; extremely rare, on Spondylus ; 



IS pool Col. 



Tablet 2429 contains 7 young sp. in different stages of 

 growth ; and 3 adult, differing in colour. 



652. ANACHIS G-ASKOINI, n. s. 



A. t.parvd, solidiore, subturrita; albidd, lineisfuscis angustis 

 spiralibus, anfr. ult v., penult, ii. ; inter posticas duas in costis 



