144 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



linear and deprived of septules. The pseudo-rimule of the peristomice has no 

 avicuhxriuin as in ahnost all other species of the genus. This avicularium is gener- 

 ally placed on the line of the areolar pores and sometimes on the frontal; it is un- 

 equally developed and almost always triangular on our fossils. The lyrule is very 

 small; it is more or less visible according to the development of the lateral lips 

 of the peristomice. 



fAa = 0. 08-0. 10 mm. „ . fL2 = 0. 36-0. 50 mm. 

 Measurements. — Apertura , n r^c, ^ ir, Ziooecia , n orv rv on ™™ 



^ [la = 0. 08-0. 10 mm. I lz = 0. 20-0. 30 mm. 



Occurrence. — ^Miocene (Duplin marl) : Wilmington, North Carolina (common) . 

 Pliocene (Waccamaw marl) : Waccamaw Kiver, Horry County, South Carolina 

 (rare). Pliocene (Caloosahatchee marl): Shell Creek, De Soto County (common), 

 and Monroe Coimty, Florida (common). Pleistocene: Vero (rare), Simmons Bluff, 

 Yonges Island, Charleston County, South Carolina (common), and Daytona, 

 Florida (rare.) 



Geological distribution. — ^Miocene of Australia (Waters) ; Quaternary of Sicily 

 (Neviani). 



Habitat. — Cosmopolitan to a depth of 160 meters. 



Plesiotypes.— Cat. Nos. 68637-68640, U.S.N.M. 



SMITTINA MALEPOSITA, new species. 



Plate 31, figs. 10, 11. 



Description. — The zoarium incrusts shells. The zooecia are distinct, separated 



by a salient thread, little elongate, hexagonal, poorly oriented; the frontal is little 



convex and formed of a granular pleurocyst surrounded by a row of areolar pores 



separated by very short costules. The apertura is semilunar with a very short 



proximal lyrule; the peristomie is of little depth and the peristomice is suborbicular. 



The ovicell is large, globular, finely perforated. On the median Une of the frontal 



there is a small tliin avicularium the beak of which is directed toward the bottom. 



,,. IK. (7ia = 0.10 mm. „ . fZ2 = 0.40 mm. 



Measurements. — Apertura , „ ,. Zooecia , ^ _„ 



' I to = 0.10 mm. ((0 = 0. 32 mm. 



Ajfinities. — This species is quite close to SmiUina trispinosa Johnston, 1838. 

 It is distinguished from it by its somewhat larger peristomice and by the place 

 of its avicularium, always placed in the vicinity of the median line of the zooecium. 

 The position of this avicularium is everywhere rather variable, but its presence 

 is constant. There is therefore a group of Smittina in which the avicularium is 

 not directly supported on the lyrule. We do not believe that this character should 

 be generic, for it does not appear to correspond to an essential and different function. 



Occurrence. — Pliocene (Caloosahatchee marl) : Shell Creek, De Soto County, 

 Florida (very rare). Pleistocene or Recent: Vero, Florida (rare). 



Cotypes.—Cat. Nos. 68641, 68642, U.S.N.M. 



SMITTINA OPHIDIANA Waters, 1877. 



Plate 3, fig. 3. 



1879. Smittina reticulata, var ophidiana'WATERS, On the Bryozoa (Polyzoa) of the Bay of Naples, 

 Annals and Magazine of Natural History, sor. .5, vol. 3, p. 40, pi. 9, fig. 1. 



1885. Smittina reticulata, var. ophidiana Waters, On the use of the avicularium mandible in the 

 determination of Chilostomatous Bryozoa, Journal Royal Microscopical Society, ser. 2, 

 vol. 0, pi. 14, fig. 6. 



