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THE VOYAGE OF H.M.S. CHALLENGES. 
Family XI. Microporidai. 
Microporidce (pars), Smitt, Hincks. 
Membraniporidce (pars), Auctt. 
Character. — The much depressed front of the zooecia beneath the chitinous epitheca 
wholly occupied, except at the summit, by a strong calcareous lamina, usually perforated or 
fissured on the sides, and sometimes forming a transverse diaphragm, which divides the 
cavity of the zooecium into two chambers. 
Besides the genera classed in the Family as thus defined, I should place in it 
Diplopora , Macgillivray, and Setosella, Hincks. 
The Family here contains the following genera : — 
1. Micropora, Gray. 
(1) Micropora uncifera , n. sp. (PI. XV. fig. 7). 
(2) Micropora coriacea (Esper). 
2. Vincularia, Defrance. 
(1) Vincularia gothica, d’Orbigny (PL XXIII. fig. 1). 
(2) Vincularia gothica , var. granulata, nov. 
(3) Vincularia labiata, n. sp. 
3. Steganoporella, Smitt. 
Steganoporella magnilabris (Busk) (PL XXIII. fig. 2). 
4. Ccileschara, Macgillivray. 
Caleschara denticulata , var. tenuis , nov. (Pl. XXL fig. 9). 
1. Micropora , Gray. 
Flustra (pars), Johnst., &c. 
Discopora (pars), Lamk. 
Micropora, Gray. 
Membranipora (pars), Brit. Mus. Cat. 
Lepralia (sp.), Norman. 
Stecjanoporella (sp.), Hincks. 
Reptescharellina (pars), d’Orb. 
Character. — Zoarium incrusting. Zocecia with an internal calcareous lamina occupy- 
ing the entire area, with a perforation at each upper angle below the orifice, which is 
apical, with a continuous calcareous peristome. 
