504 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Affinities. Busk, in 1884, created the genus Reteporella for the Ketepores not 

 reticulated ; Jullien, in 1903. appears to have admitted this genus, but we can not 

 recognize a genus based purely upon a zoarium, unless its zooecial characters are 

 at the same time perfectly delimited. 



This species differs from Retepora simplex (Busk) Eeuss, 1869, in the absence 

 of a labial mucro on the peristomice and of two oral avicularia. 



Occurrence. Middle Jacksonian: Wilmington. North Carolina (common) ; near 

 Lemids Ferry. South Carolina (common) ; Eutaw Springs, South Carolina (rare). 



Cotypes.C&t. Nos. 64158, 64159. U.S.N.M. 



RETEPOKA SCUTULATA, new species. 

 Plate 65, figs. 9-14. 



Description. The zoarium is free, reticulate ; with narrow and elongate meshes 

 or fenestrae ; the dorsal is smooth or very finely granulated ; the vibices are rare 

 and hardly salient. The zooecia are indistinct; the frontal is smooth and convex. 

 The apertura is deep, buried, transverse; the peristomice is oblique, ogival; its 

 anterior lip bears on one side a small avicularium, thin and elongated. The ovicell 

 is little salient, smooth ; it bears an upper," almost round cleft ; its orifice is not 

 visible. 



w . -p , .. lhpe=0.05mm. r/=0.75-1.35 mm. 



Measurements. Jreristomice- , Fenestrae< 7 , ~ . .. . 



(lpe=0.10 mm. If 0.45-0.50 mm. 



Affinities. This species differs from Retepora ramosa and Retepora laciniosa 

 in its invariably reticulated zoarium. 



It differs from Retepora marginata Eeuss, in its indistinct and nonborderecl 

 zooecia. and from Retepora vibicata Goldfuss, 1827, in the absence of lateral 

 areolar pores. 



Occurrence. Upper Jacksonian (Ocala limestone) : Chipola River, east of 

 Marianna, Jackson County, Florida (common) ; Alachua, Florida (rare). 



Cotypes. Cat. No. 64157, U.S.N.M. 



RETEPOKA LACINIOSA. new species. 



Plate 96. figs. 12-22. 



Description. The zoarium is free, branched, not reticulated, bifurcated, some- 

 what compressed, formed of three longitudinal rows of zooecia. The dorsal is 

 smooth or granular; the vibices are very little salient, and circumscribe some irregu- 

 lar lozenge-shaped areas. The zooecia are indistinct; the frontal is smooth and 

 convex. The apertura is semilunar (interior) and bears a minute proximal rimule 

 irregularly placed; the peristomice is very oblique; it bears on its proximal lip 

 a small tuberosity and a small oral avicularium separated by a slit or rimule- 

 spiramen. The ovicell is hyperstomial but very deeply imbedded in the distal 

 zooecia; its orifice is not visible; it bears superiorly a small slit, somewhat elon- 

 gated. The small labial avicularium is frequently transformed into a large frontal 

 avicularium. 



Measurements. Peristomice. ?/>e=0.11 mm. 



