NOR TH PA CIFIC llOLOTII 1 111 A XS—ED WA RDS. 



55 



Fir;. 5.— CucUMARiA calcic; era. 

 Uri>p:R siiRFACE OF table from 



THE BODY-WALL. ( • nO|.) 



Tentacles. — Ten, the two ventral about half the size of the others 

 and arising somewhat nearer the mouth. Color, mixed white and 

 clove brown. 



Genital jxtp'dht. — Three millimeters long, colored like the tentacles. 



Pedicels. — Contiued to the anil)ulacra; dorsal in two zig-zag- rows, 

 ventral in four to live zigzag rows toward the middle. Smaller toward 

 the extremities, especially posteriorly. Each pedicel is conical, non- 

 retractile, the longest ventralh' (2 to 3 mm.). 



Body wall. — Thin (about 0.3 mm. thick), semitransparent, tirm and 

 rough to the touch from the numerous crowded, imbricated spicules. 

 In the introvert, especially thin and trans- 

 parent with scattered, knobbed plates. 



Bell, 1S83 (pp. 481-484), Lampert, 1885 

 (p. 142), Liitken, 1857 (pp. 6-T), Maren- 

 zeller, 1874 (pp. 11-12), Theel, 1886 (pp. 

 103-104), Duncan and Sladen, 1881 (p. 7), 

 and Ludwig, 1886 (pp. 278-279), have de- 

 scribed the spicules. Tlje last two descrip- 

 tions, together with that of Liitken, are es- 

 pecially good, but since 1 have found new 

 spicules in the introvert and tentacles, as 

 well as ridges on the perforated plates and 

 the disks of the tables, I have concluded to redescribe the spicules in 

 general. 



Spicules (if the hodij yndl. — Tahles. — Disk flat, ver}" irregular, round 

 to four-rayed with all intermediate forms. Four central holes sur- 

 rounding the spire constitute a diamond (tig. 5), and vary from 0.02 to 

 0.04 mm. in diameter, being generally, but not alwaj's, larger than 

 the peripheral holes, which vary from 0.01 to 0.04 mm. In the elon- 

 gated and stellate forms the holes, num- 

 bering from four to forty, are in one to 

 three rows. These rows are usually more 

 distinct in the prolongations. 



Besides the rows there are often addi- 

 tional holes irregularly distributed. In 

 the circular disks the holes are in one to 

 two irregular rings. Sometimes there are ridges running out from 

 the spire onto the rays between the rows of holes (tig. 5). 



Size of d'ishs in millimeters. — Length 0.15 to 0.45, average 0.23; 

 width 0.06 to 0.44, average 0.18; diameter of circular forms 0.1; 

 average width of rays in stellate forms 0.08. 



Spire. — Conical or club shaped (tig. 6); may be solid, but generally 

 gives evidence of being composed of four rods, which, in their more 

 or less complete fusion, leave from one to four distal holes, and some- 

 times one to two below these. In the young (10 to 15 mm. long) the 



Fig. 6.— Cu(;umaria calcigera. Side 

 view of table from the body- 

 WALL. (X llOf.) 



