A MONOGRAPH OF THE EXISTING CHINOIDS 439 



In the specimen from Madagascar the cirri are XXX, about 22, and smooth like 

 those of S. i. protectus. The sixth segment is the longest, half again as long as broad. 

 The longest cirrus segments are slightly constricted centrally. There are about 25 

 arms. The IIIBr series are in all cases developed internally instead of externally 

 as is usual in the species of Stephanometra. P 2 is long, stiff, and spinelike, with about 

 16 segments. P 3 is small and feeble. 



Dr. E. A. Smith described Antedon indica from Rodriguez in 1879 as follows: 



Rays 30; dorsal disk, small, convex, subpentagonal, sculptured with little contiguous and well- 

 defined pits which are the sockets of the cirri; these are about 45 in number; radial joints two, the 

 axillary without a syzygium; between this and the next bifurcation are two articulations; after 

 two more joints the two outermost arms bifurcate; none of the brachial axillaries with a syzygium; 

 each third segment above an axillary has a syzygium, and on the arms the next joints with syzygies 

 are at very unequal distances, the most proximate being separated by as many as 20 joints, but usually 

 by about 14; then nearer the extremity of the rays, they are rather closer together, the interlying 

 joints varying in number from 6 to 10. 



The second pinnulae are very long and composed of much elongated joints. The colour of the 

 specimen is pale purplish brown, with the sutures of the ray-articulations blackish brown. Diam- 

 eter of disk 6 mill., length of rays about 6 inches (153 milh'm.) * * * 



The remarkably elongate second pinnulae (17 mill, in length) are situated on the first and 

 second segments above those joints which always have a syzygium, and which are the third joints 

 above the last brachial axillaries, or in other words, they rest upon the fourth and fifth joints 

 above these axillaries. They consist of about 17 joints, which are elongate, cylindrical, those at the 

 middle being the longest, and the two or three basal ones the shortest. 



Dr. Smith called attention to the fact that in the preliminary description pub- 

 lished in 1876 he had, by an oversight, stated that the two innermost arms following 

 the first axillaries bifurcate; it should have read outermost or exterior that is, the 

 IIIBr series are developed externally, not internally. He figured a cirrus that was 

 found among debris at the bottom of the bottle containing the specimen, but he 

 said it is not absolutely certain that it belongs to the species described, although 

 the evidence points to that conclusion. The cirrus he figured belongs not to S. 

 indica but to some species of the family Comasteridae. I examined this specimen at 

 the British Museum in 1910. It is best described as resembling a specimen of S. 

 protectus, but with P 2 longer and composed of more numerous segments; though 

 slender distally, P 2 is not flagellate. 



The specimen recorded by Chadwick from Ceylon hod 29 arms. The original 

 visceral mass was almost completely displaced but remained in organic continuity 

 with a new one in an early stage of formation. 



Dr. Hubert Lyman Clark described Lamprometra callipecha from Mer Island, 

 Torres Strait, in the following terms: The centrodorsal is rather small, flat, less than 

 5 mm. in diameter, with the bare dorsal pole 3 mm. across. The cirri are XXXI, 

 23-25, about 12 mm. long. The first-third segments are short and thick, the fourth- 

 eighth are longer than broad, and those following are broader than long. The cirri 

 are laterally compressed distally, and the distal segments have low and minute longi- 

 tudinal dorsal ridges. The opposing spine is well marked. The 18 arms are about 65 

 mm. long by 10(?) mm. broad. There are four IIBr and four IIIBr series present, all 2. 

 The IIBr series are not appressed; the ossicles of the division series have slight lateral 

 expansions. The brachials are smooth, not overlapping, wedge-shaped, becoming 



