678 PROCEEDINGS OF THE NATIONAL MUSEUM, vol. xxxii. 



many as fourteen, ])ut common iy only twelve. (3) Besides these there 

 are still larger tables (Plate LXX, lig-. ly) of similar general appearance, 

 but with the spire 0,08 to 0.1 mm. high and the disk about 0.08 nmi. in 

 diameter and with more numerous peripheral perforations. These are 

 found at the bases of the papilla?, in a narrow zone, between the ordi- 

 nary small tables and the large single-pointed variet^^ It is here that 

 the large tables with two or three points or with the sides of the 

 spire toothed are to be found, forming more or less perfect transi- 

 tional stages. In the ventral perisome there are comparatively few 

 tables without an\', or with only rudimentary, spires. (4) Dichoto- 

 moush' branched rods, 0.03 to 0.04 mm. long, forming more or less 

 incomplete rosettes, are common in the dorsal perisome, but appear to 

 be absent from the ventral, or at least not inmierous. (5) C-shaped 

 bodies 0.09 to 0.14 mm. long are present in both dorsal and ventral 

 perisome. (6) Besides these, near the tip of papillse, and more abun- 

 dantly in the pedicels, are stout supporting rods, more or less dilated 

 at the center, and perforated. The edges of the rods are finely spinous. 

 These supporting rods vary in length, averaging 0.35 to 0.5 mm. long- 

 in the ventral perisome, somewhat shorter in the dorsal, where they 

 often lack the central plate-like expansion and have instead one or 

 more branches with spinous margins. The terminal portion of each 

 papilla is strengthened, not by the rods, Ijut })y perforated plates, 

 about 0.9 mm. in diameter, the margins being irregular, often formed 

 of spinous branches of incomplete trabeculsK. The perforations are 

 relatively large. Thus, counting from the base of each papilla, the 

 following deposits are found: Ordinary- tables and rosettes, larger 

 tables, transitional tables, conical-spired large tables, supporting rods, 

 supporting plates. 



This species lives in tide pools, and is found on the reef, between 

 Honolulu and Waikiki, near the outer edge, where the pools are large 

 and are not cut off from the ocean for any length of time. The animal 

 is dark greenish and rather inconspicuous. One specimen was found 

 to contain a fair-sized tish. I^ierasfer homei, which had taken refuge 

 in the large respiratory tree, and had its snout protruding through 

 the anal aperture. 



The species is apparently most nearly related to SticJiop}i8 ]iort'enf< 

 Selenka, from which it differs in having ambulacral appendages on the 

 dorsal interambulacra, as well as on the aml)ulacra. From Stichopns 

 godejfroyi it is distinguished by the C-shaped bodies, which are not 

 found in that species. The present form has been known as StlcJiopus 

 godeffroyl variety b, a cumbersome title, which does not indicate its 

 true relationship. If the form is not a true species it would probaljly 

 be united with *S'. Jiorreiis rather than with godejfroyi. There seems 

 little doubt, however, that we have here a true species. S. godejfroyi, 



