18 MARINE INVERTER RATA OF GRAND MAN AN. 



T. DIVISA, St., n. s., Fig. 6. This species resembles T. flabellaris, Johnst., but 

 differs in being much more deeply divided into broad lobes or branches ; also in its 

 more erect and elongated cells, which are without transverse wrinkles. Color 

 waxen white ; length about three-tenths of an inch. Found on a valve of Pscten, 

 taken in the coralline 2one to the eastward of the islands. 



IDMONEA PRUINOSA, St., n. s., Fig. 7. Polypidorn erect at base, the upper 

 branches curving over, so as to be nearly horizontal, with the cell-bearing surface 

 upward. Cells arranged in transverse rows of four or five, closely packed, which 

 rows are arranged along each side of the face of the branch, either alternate or 

 nearly opposite. It is a rather thick and solid species, of a white color, bright and 

 shining. It grows often to a height of one or two inches, and is very distinct from 

 the European species, /. atlantica. It was found in considerable numbers in deep 

 water, especially on shelly bottoms. 



CRISIA CRIBRARIA, St., n. s., Fig. 8. Polypidom thickly branched, with the cells 

 so crowded as to form often two or three longitudinal rows, in which they are 

 usually opposite. The back of the polypidom is flat, or but slightly convex, pre- 

 senting an irregularly striate appearance. Color white. Taken in twenty f., east 

 of Duck Island. 



C. DENTICULATA, Johnst., Brit. Zooph. On a sponge, taken in ten f., off Cheney's 

 Head. 



HIPPOTHOA RUGOSA, St., n. s., Fig. 9. This appears nearest allied to H. catenu- 

 laria, from which it differs in its numerous transverse strisc, or rugosities, and by 

 its somewhat smaller apertures, in each of which a rectangular foramen is observ- 

 able. It was found widely branched on small pebbles dredged in twenty-five 

 fathoms on shelly bottoms. 



LEPRALIA ANNULATA, Johnst. Cellepora annulata, 0. Fabr., F. G. This differs 

 somewhat from the descriptions, but is probably one of the numerous varieties of 

 the species named. Dredged in deep water, encrusting shells, etc. 



L. CANDIDA, St., n. s., Fig. 10. Cells robust, oval, white, coarsely punctate, with 

 small apertures, which are without spines, but have two blunt projections result- 

 ing from a sinus, at the top. Dredged on stones in thirty-five f., in the Hake Bay. 



L. CRASSISPINA, St., n. s. Cells sub-globular, distinct, crowded, standing ob- 

 liquely, or sometimes almost erect; with very minute punctures. Aperture large, 

 trumpet-shaped (from a slightly contracted neck), with thickened margin, one 

 stout pointed spine in the middle above, and a long blunt spine at each extremity 

 of the distal margin, which spines are often rough with minute points. Length 

 of each cell one-fortieth of an inch. Color in life pale greenish. Found in small 

 radiating patches on stones and shells from deep water. 



L. LABIATA, St., n. s. Ovigerous cells only of this species were observed ; and 

 in them the ovarian capsules appeared in the form of a conical chimney on the top 

 of the aperture. The cells were sculptured with irregular distant radiating ridges, 

 commencing at the top of the chimney, and spreading out over the back of the 

 cell. The aperture is sub-oval, truncate behind, and with the distal margin ex- 

 panded over the cell immediately in front, in the form of a broad lip. Found on 

 small pebbles from deep water. 



