42 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



mens, and in reviewing Mr. Chadwick's paper upon the Red Sea 

 crinoids I mentioned that the I. nana group of species occurred there, 

 for three years ago, while at Cambridge, I had been permitted to 

 look over the letters sent by Capt. Nicholas Pike to Prof. Louis 

 Agassiz while the former was United States consul at Mauritius. In 

 one of these letters Captain Pike, in his usual charming style, describes 

 a little crinoid which he found on the reef near Port Louis (about 

 1867), but which broke all up so that he could not preserve it. How- 

 ever he made a color sketch of it, and this I was able to recognize as 

 being of a species near I. nana. 



IRIDOMETRA ^GYPTICA, new species. 



Antedon parvicirra Chadwick, Journ. Linn. Soc. (Zool.), vol. 31, 1908, p. 45. 

 ? Iridometra parvicirra A. H. Clark, Ainer. Naturalist, vol. 43, 1909, p. 255. 



Description. — Cirri XXV, 14-16 (usually 15-16), 13 mm. long, 

 comparatively stout; first segment short, second about as long as 

 broad, fourth or fifth the longest, about two and one-half times the 

 median diameter; following segments slowly decreasing in length 

 so that the antepenultimate is about one third longer than broad. 

 The longer proximal segments are constricted centrally, with enlarged 

 distal ends; there are no dorsal spines or projections. The cirri 

 are rather strongly constricted laterally. The opposing spine is 

 prominent, terminal, and directed obliquely forward. 



Ten arms, apparently about 40 mm. long, resembling those of 

 I. nana. 



Pi short, evenly tapering, about 5 mm. long, with eight segments 

 which become twice as long as broad distally; P 2 considerably 

 larger and much longer, but evenly tapering and very slender dis- 

 tally, 9.5 mm. long, with twelve segments winch become much 

 elongated outwardly; P 3 larger than P 2 , much the largest pinnule 

 on the arm, 13 mm. long, becoming very slender distally, with eighteen 

 to twenty segments, the distal much elongated, three times as long 

 as broad; the ends of the segments are slightly swollen, but there 

 are no spinous projecting borders; P 4 small and weak, 4.5 mm. to 5mm. 

 long, the outer segments much elongated and with somewhat swollen 

 ends; P 5 slightly longer; following pinnules similar, becoming more 

 slender and increasing in length distally. 



Localities. — Suez Bay ; Gulf of Suez. 



Depth. — 10 fathoms (one record). 



Remarks. — This new species is very readily distinguishable from 

 Iridometra parvicirra by its very much larger cirri, though the pin- 

 nulation is not very different. 



