KLORIDAN BRYOZOA. 49 



Myriozoum ovum (Pl. VII, figs. 148 — 151). 



Char.: Colonia, quaa ovi formam refert, axi perforata, longitudine circiter 2 ram., 

 pars sine dubio fuit stirpis moniliformis, articulatse, e zoceciis ex axi in lineas decem 

 radiantibus construitur. Zooecia cancellata, fronte quadrata, aperturam (cujus latitudo 

 = 0,12 — 0,13 mm.) rotundam praebent, ad articulationem operculi constrictam (quare 

 margo proximalis hujus. aperturse concavus semicirculum minorem refert), aviculariis 

 rotundis (ellipticis) ad lineas limitares in angulis distalibus positis muniuntur. 



Hab.: Colonias mortuas, disjunctas, e proff. 114 et 233 orgyarum cepit Pourtales. 

 An hasc species sub noraine Ovulitis *), stratuum Tertiarium fossilis, antehac sit de- 

 scripta, nondum decerni potest. 



As to the scientific history of this species, if it should be known before, we can 

 only refer to the descriptions of the fossil Ovulites, withont, with any certainty, after 

 these descriptions to determine the species, because the zocecial constitution of the 

 fossil yet seems be nnknown. The colonial form, although here it seems to be very 

 characteristic, all too easily can deceive us, and therefore, until a new examination of 

 the fossil can be done, I have proposed a new name for it. The specimens, sent by 

 Pourtales, were taken off Tennessee reef and Pacific reef, at the above-named depths. 

 They are all dead, but, I believe, not in a fossil state, as the apertures and pores are 

 all open, with their margins very sharply defined. 



The colonial growth of this species, as to the arrangement of the zooecia in linear 

 rows radiating from the longitudinal axis, evidently agrees with that of the raised 

 Leiescharce and the Myriozoum truncatum. Furthermore, it gives us a hint, how the 

 constrictions on the stem, so common in the Leieschara coarctata 2 ), are to be accounted 

 for. These constrictions, if we imagine them to be fullfilled, until they reached the 

 axis of the stem, would have prodnced the same moniliform constitution of the stem, 

 as what seems to have been the manner of growing of the Myriozoum ovum. How 

 the ovuliform internodes of this species may have been connected, not yet having been 

 found in the living state, we may imagine after the analogy of the Escharella palmata 3 ) 

 and Caberea i ). Still, the Myriozoum ovum presents that peculiarity, that the internodes 

 are longitudinally perforated, what would induce the supposition, that it has been 

 growing on a foreign, cylindrical, supporting matter; but the regularity of the inter- 

 nodes opposes that supposition, and, in the raised Leiescharce, as well as in the Myrio- 

 zoum truncatum, though their axis is not hollowed, it is occupied by a spongy sub- 

 stance of porous cells, between the bases of the zooecia, thus, in this respect, also, pre- 

 senting an analogy to the Myriozoum ovum. 



The form of the zocecial aperture, easiest to be compared Avith two unequal half- 

 circles, the one inversely attached to the other, reappears in the aperture of the avi- 

 cularia, whose mouth, also, is constricted at the articulation of the mandible. These 



') Ovulites, Lam., Anim. s. Vert., ed. 1, vol. 2 p. 194; ed. 2, vol. 2 p. 298, ubi ceteri scriptores leguntur. 

 Hagenow, Sclerop. und Thatlopoden in Geinitz, Grundr. d. Versteinerwngskunde, p. 634 (p. 50 sep.). 



2 ) Corapare Öfvers. Vet Akad. Förh. 1867, p. 485. 



3 ) Öfvers Vet. Akad. Förh. 1867, Bih., pp 79 and 80. 



4 ) Öfvers. 1867, p. 327. 



K. Vet. Ak:ul. Hanai. B. 11. N:o i. ' 



