4 Dr. P. P. Carpenter on new Forms of Mollushs 



•liagoiialiter parum producta ; marginibus subquadrangulatim ro« 

 tundatis ; umbonibus prominentibus, valde antice intortis ; tota 

 superficie ut in C. decussata sculpta, costulis crebris radiantibus 

 aequidistantibus, hie et illic aliis intercalatis ; lirulis concen- 

 tricis decussantibus : intus raargine dorsali brevissimo, arcuato, 

 dentato ; ligamento curtissimo, in fossa omnino interna, celata, la- 

 mina definiente, sito ; lamina cardinali sub umbonibus intus por- 

 recta, dentibus validis instructa ; marginibus internis omnino cre- 

 jiatis ; cicatr. adduct. subaequalibus, ventraliter sitis. Long. •!, 

 lat. -12, alt. -09 poll. 



Located provisionally in Crenella from its likeness to C. de- 

 cussata, but with peculiarities of hinge and adductors which 

 approach Nuculina on one side and Cardilia on another. 



Genus Beyophila*. 



Animal Aviculidaeum, viviparum : inter algas, etc., habitans. 

 Testa Pinnaeformis, extus prismatioa, intus subnacrea : ligamentura 

 Bolidum : umbones extantes, terminales, intus concavi. 



10. Bryophila setosa. 



B. testa parva, regular! ; cinerea, salmoneo seu chocolateo, intus sub- 

 iiacreo, exquisite tincta : t. juniore planata, semirotundata, dor- 

 fealiter recta, sequilaterali, 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 

 r-jstita, radiis setarum subdistantibus, marginibus eleganter pecti- 

 natis : intus ligarpento solido dorsaliter producto ; limbo pallii 

 sequaliter prope marginem decurrente ; cicatr. adduct. submediana, 

 inconspicua ; postice hiante ; antice propter byssum tenuera si- 

 nuata. Long. '13, lat. "2, alt. '1 poll. 



Like a minute Pinna, or a transverse Margaritipliora without 

 earij, or an Isognomon without pits. Differs from the other 

 Aviculids in being viviparous^ like some other minute bivalves, 



11. lAtys casta. 



tA. testa elongata, tenui, subdiaphana, albida; antrorsum pauliim 

 cnmidiore ; spira celata, lacunata, (t. adnltae) baud umbilicata ; 

 columella paulum intorta, effusa ; umbihco antico miniuio ; labro 

 postice producto, obtuse angulato ; tota superficie subtiliter spira- 

 iiter striatula. Long. -A, lat. MS poll. 



On the confines of the genus, related to Cylichna. 



13. Ischnochiton parallelus. 

 I. testa ovata, subelevata (ad angulum 120°) ; rufo-fusca, olivaceo 

 tincta; vahis latis, marginibus parum rotundatis, interstitiis par- 



* Xijivov, sea-moss; (^i\os, loving. 



212 



