194 
antico decliviore, postice subacuminato, sinu siphonali an- 
gustissimo profundo sursum spectante, limbo interno ob- 
solete radiatim suleato. Long. 37, alt, 34 mill. — St. Juan 
de Nicaragua spec. plura. 
286. Polymesoda(Egetaria)pullastraMörch. 
— T. late ovalis, tenuis, albescens, radiatim subtilissime 
striata valde inaequilateralis convexiuscula, antice brevissime 
angustata, postice late rotundata; margo dorsalis anticus 
proeipite declivis, posticus rectus fere horizontalis, postice 
angulo obtuso; margo ventralis parum arcuatus; area po- 
stice violaceotincta; dentes cardinales praecedentis, sed 
minus validi; dens lateralis posticus valvae sinistrae remo- 
tissimus, compressus, inter Jaminas 2 valvae dextrae rece- 
ptus; dens anticus subapproximatus. Sinus siphonalis an- 
gustissimus, sursum spectans. Long. 301/,, alt. 23 mill. —- 
Realejo specimen unicum mortuum ubique erosum. -- Forma 
Veneris pullastrae et decussatae L. 
287. Dosinia Dunkeri Philippi Abbild. 1844. 
p. 170. t.2. f.5. — Puntarenas ad prof. 15 org. specimina 
5/, plus vel minus ventricosa; sinus siphonalis plus vel 
ıninus acuminatus. 
288. Dosinia simplex Hanl.? Catal. pl.15. f.41. 
Sow. Thes, fig. 6. — D. lunaris Sow. Thes. f. 33 quoad 
formam partis posticae testae melius quadrat. Long. 203/,, 
alt. 21 mill. — Realejo. 
289. Tivela undulata Sow. Thes. p. 618. f. 12. — 
Realejo specimina plura. Long. 58, alt. 45 mill. 
290. Var. praecedentis? Cytherea planulata Brod. Beech. 
voy. pl. 43. f. 6. Differt a praecedente postice declivior, 
angulo ventrali postico magis acuminato, carina umbonali 
fortiore, antice subtilius striata. Long. 58, alt. 48 mill. — 
Realejo valva solitaria. 
291. Tivela radiata Sow. Proc. 1835. p. 23. Thes. 
f, 31; C, Byronensis Gray Anal. 1838: p. 304; V. Salan- 
