MOLL U SCO I DA. 



[PTI.RHI. 



sinistralis, Hall, 1887, Pal. N. Y., vol. 6, 



p. 174, Up. Held. Gr. 



PTILOTRYPA, Ulrich, (in press,) Geo. Sur. 

 111., vol. 8, p. 393. [Ely. ptilon, feather ; 

 trupa, an opening.] Bifoliate, forming 

 large ramose expansions. Zocecial 

 tubes and apertures very oblique; at 

 the upper extremity of the acutely 

 ovate aperture there is a small cell 

 which is best seen in tangential sec- 

 tions; surface with irregular, longitu- 

 dinally channeled spots. Type P. ob- 

 liquata. 



obliquata, Ulrich, (in press,) Geo. Sur. 



111., vol. 8, pi. 30, Hud. Riv. Gr. 

 RAMIPORA, Toula, 1875, Permo-Carbon- 

 Fossilien von der West Kuste von 

 Spitzbergen, p. 6. [Ety. ramus, branch ; 

 poros, pore.] Staff in cross section, 

 rounded, rhombic, with keel on both 

 sides; branches in pairs, one on each 

 side, and these connected in like man- 

 ner by rays, upward and downward; 

 pores on one side, on each side of the 

 keel. Type R. hochstetteri. 



hocbstetteri, Toula, 1875, Permo-Carbon- 

 Fossilien von der West Kuste von 

 Spitzbergen, p. 6, Carboniferous. 

 REPTARIA, Rolle, 1851, Leonhard & Bronn, 

 Neues Jahrb., p. 810. [Ety. repto, to 

 creep.] Zoarium parasitic, procum- 

 bent, attached its entire length; con- 

 sisting of a rachis, from Which pro- 

 ceed laterally, at regular intervals, 

 cylindrical cell tubes, and at irregular 

 distances tubes which have the same 

 manner of growth as the primary 

 rachis; cell-tubes turn abruptly outward 

 at their distal extremities, and open in 

 an aperture parallel with the axis of 

 the branch. Type R. stolonifera. 



nodata, Hall, 1884, (Ptilionella nodata,) 

 Rep. St. Geol., p. 57, Ham. Gr. 



penniformis, Hall, 1884, (Plilionella penni- 

 forrnis,) Rep. St. Geol., p. 56, Ham. Gr. 



stolonifera, Rolle, 1851, Leon hard & 



Bronn, Neues Jahrb., p. 810, Ham. Gr. 



Retepora, Lamarck, 1801, Syst. An. sans. 



Vert. [Ety. rete, net; poros, pore.] Not 



a Palaeozoic genus. 



angulata, see Subretepora angulata. 



antiqua, as identified byd'Archiac &Ver- 

 neuil. Not American. 



archimedes, see Archimedes. 



a&perato-striata, see Subretepora asperato- 

 striata. 



clintoni, Vanuxem. 1842, Geo. Rep. 3d 

 Dist. N. Y. Not recognized. 



diffusa, see Thamniscus diffusa. 



fenestrata, see Subretepora fenestrata. 



foliacea, Hall, 1847. This name Prof. 

 Hall says may be erased from the list. 



gratilis, see Subretepora gracilis. 



hamiltonewis, see Reteporina hamilton- 

 ensis. 



incepta, see Subretepora incepta. 



phillipsi, see Reteporina phillipsi. 



prisca, see Reteporina prisca. 



trentonensis, see Subretepora trentonensis. 



RETEPOBINA, D'Orbigny, 1850, Prodr. d. 

 Paleont., t. 1., p. 101. [Ety. from Ret- 

 epora.] Resembling Retepora, but 

 having on the greater part of the 

 branches only two ranges of cell aper- 

 tures ; branches connected byanastomo- 

 sis or by dissepiments so short as to be 

 essentially wanting. Type R. prisca. 



coalescens. Hall, 1887, Pal., N. Y., vol. 6, 

 p. 120, Up. Held. Gr. 



hamiltonensis, Prout, 1866, (Retepora 

 hamiltonensis,) Trans. St. Louis, Acad. 

 Sci., vol. 2, p. 412, Ham. Gr. 



perundulata, Hall, 1884, (Fenestella per- 

 undulata,) 36th Rep. N. Y. St. Mus. 

 Nat. Hist., p. 63, Ham. Gr. 



phillipsi, Nicholson, 1874, (Retepora pbil- 

 lipsi,) Geo. Mag. n. s., vol. 1, p. 163, 

 Cornlferous Gr. 



prisca, Goldfuss, 1831, (Retepora prisca,) 

 Petref. Germ., vol. 1, p. 103, Ham. Gr. 



rhombifera, Hall, 1881, (Fenestella rhom- 

 bifera,) Trans. Alb. Inst., vol. 10, p. 32, 

 and Pal. N. Y., vol. 6, p. 120, Up. 

 Held. Gr. 



striata, Hall, 1884, (Fenestella striata,) 

 36th Rep. N. Y. St. Mus. Nat. Hist., p. 

 72, Ham. Gr. 



RHINIDICTYA, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist,, vol. 5, p. 152. [Ety. rhine, 

 file; dictyon, net.] Zoarium narrow, 

 branching at long intervals ; cells sur- 

 rounded by a close series of small 

 spiniform tubuli ; otherwise like Stic- 

 topora. Type R. nicholsoni. Syn. for 

 Sulcopora probably. 



Fro. 507. Rhinidictya nicholsoni. Natural size 

 aud magnified ISdiam. 



granulosa, Hall, 1887, Pal. N. Y., vol. vi, 

 p. 40, Low. Held. Gr. 



Fio. 508. Rhinopora verrncosa. Natural siae 

 and enlarged. 



nicholsoni, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist., vol. 5, p. 170, Trenton Gr. 



