34 PROCEEDINGS OF I HE NATIONAL MUSEUM TOL. 72 



CALLOPORA CAUDATA, new species 



Plate 3, Figure 8 



Description. — The zoarium encrusts corals, the zooecia are arranged 



in uniserial series, ramified at right angles; they are oval, provided 



with a smooth convex gymnocyst, and terminated by a long, very 



thin, caudal portion. The ovicell is large, globular, smooth, never 



closed by the operculum. 



T,, ^ r\ ■ Iho = 0.20 mm. 



Measurements. — Opesiai-, ^.^ 



^ Uo = 0.16 mm. 



[Z0 = 0.70-0.90 mm. 



Zooeciaj^^^^ 20-0.22 mm. 



Affinities. — The form and structure are that of a Pyripora but 

 there is present a hyperstomial ovicell. We have discovered in the 

 Philippines another uniserial species, Callopora uniseriata, in which 

 the dimensions are much larger and in which the caudal portion is 

 very small. 



We do not see the necessity of creating a new genus for the recep- 

 tion of this uniserial species in which all the functions are identical 

 with those of other Callopora. Certain zooecia are simply deprived 

 of lateral septules, a suppression which is simply the result of their 

 special mode of development. Certain uniserial Cretaceous species 

 considered as Pyripora are perhaps also Callopora but the number of 

 specimens collected is not sufficiently large to positively affirm the 

 nonexistence of an ovicell. 



Our specimens were living and oviceiled, January 17, 1885. 



Occurrence. — Albatross Station D. 2319, north of Cuba; 23° 10' 

 37" N.; 82° 20' 06" W.; 143 fms.; gray coral. 



Eolotype.—C&t. No. 7465, U.S.N.M. 



CALLOPORA TENUISSIMA, new species 

 Plate 26, Figures 1, 2 



Description. — The zoarium encrusts shells. The zooecia are dis- 

 tinct, much elongated, elliptical, or fusiform. The mural rim is very 

 thin, smooth. The opesium has the form of the zooecium. The 

 ovicell is small, globular, finely granular. The avicularium is falci- 

 form, unguiculated with two small lateral denticles; it is placed in 

 the proximal portion of a zooecium with aborted polypide. 



ri2 = 0.55-0.60 mm. 



Measurements. — Zooecia^^, ^ ^n nor 



1Z2 = 0.30-0.35 mm. 



., ^ , . fXs = 0.50-0.55 mm. 



Aborted zooecia<^ 7 n on n oo 



its = 0.20-0.23 mm. 



Affinities. — The zooecia with aborted polypides are smaller and 



especially narrower than the ordinary zooecia. They are always 



primoserial, but all the primoseriai zooecia do not bear avicularia. 



