134 



PROCEEDINGS OP THE NATIONAL MUSEUM 



VOL. 72 



,, . A ^ ha = 0.12 mm. 



Measurements. — Aperturei, „ „„ „ ^„ 



^ . Ua = 0.08-0.09 mm. 



„ . fis = 0.60-0.70 mm. 

 Zooecia 7 . _„ 



1/2 = 0.50 mm. 



Om* specimens were dead when dredged; one of them was green. 



We have figured the best preserved. 



This species is rather cosmopohtan. We rediscovered it in the 



PhiHppines and have indicated the principal variations. 



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



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



Albatross Station D. 2639, Straits of Florida; 25° 04' 



50" N.; 80° 15' 10" W.; 56 fms.; coral sand. 



Fowey Light, 15 miles south of Miami, Fla.; 40 fms. 



Tortugas, 13 meters (Osburn), 68 meters (Smitt). 



Pliocene, Minnitimmi Creek, Bocas Island, Almirante 



Bay, Panama. 



Plesioty pes. —C&t. Nos. 7545, 7546, U.S.N.M. 



MASTIGOPHORA POROSA Smitt, 1873 



Plate 19, Figures 8, 9; text Figure 29 



1873. HippotJioa porosa Smitt, Floridan Bryozoa. 

 Kongl. Svenska Vetenskaps-Akademiens, 

 Handlingar, vol. 11; p. 41, pi. 7, fig. 158. 



, ^ \ha = 0.10 mm. 

 ^P^^^^^n/a = 0.14mm. 



JZ5! = 0.70-0.80 mm. 

 1/2 = 0.45-0.90 mm. 

 Structure. — Our colonies are small and rare 

 in each locality. The operculum is thin with 

 a broad triangular rimule. The mandible of 

 the vibraculum is setiform and short; it moves 

 obliquely. The ovicell is very short and of 

 the same structure as the frontal. 



Biology. — The specimens encrust nullipores, 

 shells, and corals. They are yellow or old 

 rose in color. They were in reproduction Jan- 

 uary 15, 1885. 

 Occurrence. ^Albatross Station D. 2405, Gulf of Mexico; 28° 45' 

 00" N.; 85° 02' 00" W.; 30 fms.; grays and, broken 

 coral. 

 Albatross Station D. 2639, Straits of Florida; 25° 04' 



50" N.; 80° 15' 10" W.; 56 fms.; coral sand. 

 Fowey Light, 15 miles south of Miami, Fla.; 40 fms. 

 Florida, 64-113 meters (Smitt). 



Blake Expedition, between Jamaica and Cuba; 18° 

 22' N.; 89° 21' W. (Norman, 1909). 

 Plesiotype.— Cat. No. 7547, U.S.N.M. 



Measurements .- 



Zooeciai 



Fig. 2 9.— MASTIGOPHORA 



POROSA Smitt, 1873. A,B. 

 Small and large opercula, 

 x 85. c. setiform mandi- 

 BLE, X 85 



