230 



DE. T. DAVIDSON ON EECENT BEACHIOPODA. 



Moncr. of Linyula, pi. ii.' fig. 6, 1859 ; E. Suess, Ueber die Wohnsitze der Brachiopoden^ Sitzungsb. 

 k. Akad. Wissenscli. Wien, Bd. xxxvii. p. 230, 1859. 



Glottidia? semen, Dall, Amer. Journ. of Conch, vol. vi. p. 159, 1870; Proc. Acad. Nat. Sci. 

 Philadelphia, p. 20-i, 1873. 



Shell small, ovate, oblong, broadest posteriorly, beak acuminated, sides subparallel, 

 front nearly straight, or very gently rounded. Valves slightly convex, flattened, smooth 

 and polished, rather thick. Length 5 lines, breadth 2J lines. 



Kah. Dredged off the Isle of Plata, West Columbia, in a fine coral sand, from a depth 

 of seventeen fathoms (Cuming). 



Ohs. I have seen only one specimen of this so-termed species. The type is in the 

 British Museum, and was described by Broderip, Trans. Zool. Soc. vol. i. p. 144, 1835. He 

 says, " It may be a young individual ; but the shell is so much firmer than it usually is 

 in Linyula (so firm, indeed, as not to have contracted at all in drying) that I cannot but 

 look on it as an undescribed species. In size and appearance it bears a near resemblance 

 to a melon-seed." It has all the appearance of a young Glottidia, but must remain an 

 uncertain species until further material is obtained. 



Classification of the Hecent Brachiopoda. 

 ARTHROPOMATA, Owen 



Subfamily TerebraUdino 



Subfamily Terebratcllinm 



Subfamily Mcyerlince . . . 

 1st Family 

 TEEEBKATTJLiDiE. \ Subfamily Mmjasinw . . . 



Subfamily Kraussudnai . 



Subfamily Argiopina> 



Subfamily not yet determined 



J 



2nd Family Thecidiid^ 



3rd Family Ehynchonellid^ 



= CLISTENTERATA, King. 



I. Geuus Lioilujris, Douville 



II. Subgenus Terebratulina, d'Orbigny . 



III. Genus Waldhihnur, King 



IV. Genus TdnhrahUa. d'Orbigny 



V. Subgenus Mar/aseUa, Dall 



VI. Genus Mec/erlia, King 



VII. Subgenus Laqueus, Dall 



VIII. Genus Bouclmrdia, Davidson 



IX. Genus Kraussina, Davidson 



X. Subgenus Mcgirliiia, Deslongchamps 

 XI. Genus Ai-fjiojpe, Deslongcbamps 



XII. Subgenus Cistdla, Gray 



XIII. ? Genus Givynla, King 



XIV. Genus Plati/dia, Costa 



XV. Genus Thecidium, Defrance 



XVI. Genus Rhyncliondla, Fiscber .... 

 XVII. Subgenus Atretia, Jeffreys 



CO ^ 



8 

 9 



10 

 t) 

 6 

 2 

 3 

 1 

 5 

 2 



1 

 8 

 1 

 2 

 2 

 6 

 2 



LYOPOMATA, Owen=TRETENTERATA, King 



4tli Family CRANiiuiE XVIII. Genus Crania, Retzius . . 



f XIX. Genus Diseinn, Lamarck 

 5tli Family Discinib/e (^ 



6tli Family LiHGTrLiD^ 



4 



1 



XX. Subgenus Discinisca, Dall 6 



r XXI. Geiuis Lingtda, Bruguit-re 8 



\ XXII. Subgenus Glottidia 3 



2? 



1 



6 Families. 22 Genera and Subgenera. 99 Species. 29 Uncertain Species. 



