47 
8 Dr. P. P. Carpenter on new Forms of Mollusks. 
31. ? Hydrobia compacta. 
1H. testa levi, curta, compacta, latiore; marginibus spire vix ex- 
curvatis ; anfr. nucl. normalibus, apice mamillato; norm. iv., tu- 
midis, suturis distinctis ; spira curtiore; basi rotundata ; apertura 
subovata; peritremate continuo ; labio definito. Long. -04, long. 
spir. *02, lat. °03 poll., div. 70°. 
This unique shell may be a Barleeza. 
32. Hyala rotundata, 
Hi. testa (quoad genus) magna, tenui, alba, diaphana; anfr. nucl. 
?D. testa subdiaphana, rufo-cornea, nitida; marginibus spire parum 
A, testa nitida, turrita, majore, solidiore, pallide fusca ; anfr. nucl. 
C. testa C. tumenti simillima, sed umbilico minore, haud carinato ; 
a 
culum distinguish it. 
B. testa regulari, rufo-fusca, hic et illic pallida, maxime nitente ; 
normalibus, apice mamillato; norm. iv., globosis, rapide augenti- 
bus, suturis valde impressis ; basi rotundata ; apertura subrotun- 
data, ad suturam subangulata; peritremate continuo; labio a 
pariete separato, rimulam umbilicalem formante ; columella valde 
arcuata. Long. ‘18, long. spir. ‘09, lat. °1 poll., div. 40°. . 
A unique shell, resembling a marine Brthinia. 
33. ?Duiala electrina. 
excurvatis ; vertice nucleoso, helicoideo ; anfr. iii., tumidis, suturis 
haud impressis, apice magno mamillato; anfr. norm. iii., subplanatis, 
suturis distinctis; sculptura haud expressa; tota superficie cos- 
tulis obscuris, latis, spiralibus, quarum vi.—viil. in spira monstran- 
tur, et ili.—v. circa basim rotundatam, interdum obsoletis, cincta ; 
costulis radiantibus cire. xviii., subobsoletis; apertura regulariter 
ovata, ad suturam angulata, peritremate continuo; basi haud um- 
bilicata; columella regulariter arcuata. Long. -09, long. spir. °07, 
lat, ‘03 poll., div. 30°. 
34. <Acirsa Menesthoides. 
levibus; norm. vi., subplanatis, suturis distinctis ; lineis crebris 
spiralibus insculpta, quarum cire. viii. in spira monstrantur ; testa 
adolescente lirulis radiantibus obsoletis decussata; apertura sub- 
ovali; columella solida, imperforata. Long. ‘42, long. spir. ‘3, 
lat. °16 poll., div. 25°. 
35. Cythnia asteriaphila. 
tenuissima, diaphana; anfr. iv., tumidis ; vert. nucl. normali, haud 
stylineo, apice mamillato : operculo tenuissimo, elementis concen- 
tricis, nucleo submediano sinistrorsum sito. Long. 03, long. 
spir. ‘015, lat. -025 poll., div. 60°. 
A solitary specimen was found by Dr. Stimpson, imbedded in 
star-fish, like Stylina ; from which genus the vertex and oper- 
36. Bittium nitens. 
be (oe. or os aes 
ee eee 
og 
foe ot 
