314 Dr. P. P. Carpenter on new Forms of Mollusks. 
Genus BryoPpHILa*. 
Animal Aviculideeum, viviparum : inter algas, etc., habitans. 
Testa Pinneeformis, extus prismatica, intus subnacrea : ligamentum. 
solidum : umbones extantes, terminales, intus concavi. 
10. Bryophila setosa. 
B. testa parva, regulari; cinerea, salmoneo seu chocolateo, intus sub- 
nacreo, exquisite tincta: t. juniore planata, semirotundata, dor- 
saliter recta, zequilaterali, conspicue punctata : t. adolescente sub- 
diaphana: t. adulta solidiore; umbonibus rectis, terminalibus, 
intus alte excavatis ; marg. dorsali breviore, recto; antico recto ; 
ventrali et postico late rotundatis: extus epidermide subspongiosa 
yestita, radiis setarum subdistantibus, marginibus eleganter pecti- 
natis: intus ligamento solido dorsaliter producto; limbo palli 
eequaliter prope marginem decurrente ; cicatr. adduct. submediana, 
inconspicua ; postice hiante; antice propter byssum tenuem si- 
nuata. Long. ‘13, lat. *2, alt. *1 poll. 
Like a minute Pinna, or a transverse Margaritiphora without 
ears, or an Jsognomon without pits. Differs from the other 
_ Aviculids in being viviparous, like some other minute bivalves. 
11. ? Atys casta, 
?4. testa elongata, tenui, subdiaphana, albida; antrorsum paulum 
tumidiore ; spira celata, lacunata, (t. adultee) haud umbilicata ; 
columella paulum intorta, effusa; umbilico antico minimo ; labro 
postice producto, obtuse angulato ; tota superficie subtiliter spira- 
liter striatula. Long. °4, lat.*18 poll. 
On the confines of the genus, related to Cylichna. 
12. Ischnochiton parallelus. 
I. testa ovata, subelevata (ad angulum 120°); rufo-fusea, olivaceo 
tincta; valvis latis, marginibus parum rotundatis, interstitus par- 
vis ; valvis intermediis valde insculptis; areis lateralibus seriebus 
granulorum a jugo radiantibus circiter vi.; interdum irregularibus, 
granis rotundatis, separatis, extantibus; areis centralibus clathris 
creberrimis, jugo parallelis, horridis, extantibus, interdum granu- 
losis, ornatis ; valvis terminalibus seriebus granulorum, cire. xx., 
interdum bifurcantibus, ut in areis lateralibus, ornatis; mucrone 
vix conspicuo ; limbo pallii angusto, pilulis furvicaceis creberrimis 
minutis conferto; lobis valvarum bifidis, terminalibus fissuris 
circ. xi. a parte externa simplici disjunctis. Long. *7, lat. 48, 
alt. °16 poll. 
Belongs to the group with minute setose scales. . 
13. Ischnochiton (? var.) prasinatus. 
I. testa I. parallelo forma et indole simili, sed vivide viridi; ar. 
diag. seriebus bullularum irregulariter ornatis; ar. centr. clathris 
* Bpvov, sea-moss; didos, loving. 
