366 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



ties. The zooecia are little distinct, limited only in young stages 

 by a separating thread, elongated, subcylindrical ; the frontal is 

 smooth, convex, ornamented in its inferior parts by a small round 

 or elliptical avicularium placed on the median axis. The peristome 

 is long; it is complete and very salient on the lateral zooecia; it is 

 incomplete and its proximal portion only is very salient on the 

 axial zooecia; it always bears on the median axis a long fissure spira- 

 men. The peristome of the lateral zooecia is somewhat indented 

 distally and bears six spines which give to it a slit aspect; the peri- 

 stome of the axial zooecia is much excavated distally, bears laterally 

 two large spines and two smaller ones. The ovicell is very small, 

 convex, deeply embedded, ornamented with a median fissure. 

 Measurements. — 



Zooecia^ 2 = 0A5 mm - Peristome! ^ te \f = ° n } 5 mm ' 



\lz = 0.25 mm. I (axial) = 0.25 mm. 



Variations. — On the dorsal the number of tuberosities placed in 

 the lozenge shaped areas is rather variable. They are frequently 



o o o o A o o 



A B C d V^ F G 



Fig. 141. — Family Reteporidae Smitt, 1867 



A, B. Retepora (Reteporella) longicollis, new species. Two opercula, X85. 

 C-E. Triphyllozoon magniscutulatum, new species. C, D. Two opercula, X85. 

 E. Mandible of a large avicularium, X85. F. Schizellozoon pheniceum Busk 

 1852. Operculum, X85. G. Lepraliella grannlata, new species. Operculum 

 X85. 



accompanied with much smaller tuberosities; they are always placed 

 in the vicinity of the longitudinal axis of the fronds. The vibices 

 are hollow and stop within a small distance of the zoarial margin; 

 this character is quite visible on the edge. The young zooecia of a 

 terminal frond are marginated; the peristome is indented proximally 

 by a pseudorimule replacing the cleft of the spiramen. The zooecia 

 of a very young zoarium are much smaller, delicate and have a general 

 aspect very different although all the characters are present; however, 

 there is not an avicularium on the frontal. The operculum is ellip- 

 tical, transverse; the interior sclerite is more or less removed from 

 the border. 



Affinities. — The distinction from Reteporella millespinae, new 

 species, in which the dorsal is almost identical, is often difficult to 

 make, but the present species differs in the presence of marginal 

 zooecia with peristome complete and salient without in the absence 

 of two large lateral tuberosities on the peristome and in the absence 

 of a small oral avicularium. 



