238 MAZATLAN UNIVALVES 
time; seven are only known from Panama, and four from 
Jamaica. They are all of exquisite beauty. 
295. VitTRINELLA Panamensis, C. B. Ad. 
V. t. subdiscoided, majore, solidiore, alba ; anfr. iv. et dimidio, 
quarum pene duo normales ; anfr. primis levibus, postea pente- 
gonatis ; carind maxime prominente vix super suturam impres- 
sam ; carina satis prominente in spird, alterd sub peripheriam ; 
quartd minus prominente in basi, quintd umbilicum maximum 
circumeunte ; supra et infra inter carinas clathratis, clathris 
(circiter xxii.) subconcavis, interstitia quadrata, profunda for- 
mantibus ; totd superficie et umbilico elegantissime spiraliter 
striata, striis clathris superantibus ; apertura vix rotundatd, a 
carimis angulatd, peritremati continuo, inter duas carinas anfr. 
penult. attingente, labro sinuato, postice expanso. 
C. B. Ad. Pan. Shells, no. 263, pp. 187, 316. 
One very fine specimen only was found of this (for the genus) 
large species, which has allowed of a description somewhat 
more in detail than that of Prof. Adams, who did not note the 
very characteristic spiral strie. It is rather more elevated 
than V.parva, with an additional keel and deeper pits. Long. ‘03, 
lat. ‘065 by °057, div. 160°. 
Hab.— Panama; 24 sp. in sand; C. B. Adams. — Mazatlan ; 
1 sp. off Spondylus ; Z’pool Col. 
Tablet 1146 contains the specimen. 
296. VITRINELLA PaRva, OC. B. Ad. 
V. t. discoidali, spirad planaté, anfractibus iv. et dimidio, 
supra et infra monstrantibus ; clathris quadratis, solidis, trans- ~ 
versis tnstructa, plus minusve distantibus, xiii. ad xxii., a carinis 
spiralibus decussatis ; anfractibus junioribus levibus, postea 
quadrigonatis ; carinis duabus medits, distantibus ; anguld 
tertid prope suturam, quarté regionem umbilicalem circumeunte ; 
jugo juata sutwram et cavitate inter gugum angulamque subcon- 
cava instructa ; peritremati ab anfractu penultino via inter- 
rupta ; labio angulato, undulato, postice swperante. 
C. B. Ad. Pan. Shells, no. 264, pp. 187, 316. 
Vitrinella clathrata, P. P. C. Cat. Prov. 
The Panama shells in Cuming’s collection have the transverse 
bars much more numerous than those from Mazatlan, and 
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