64 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



wig's variety (2-14). Considering the variation recorded for the ped- 

 icels, it is doubtful, with our present knowledge of the species, if a 

 variety should be established upon this basis. The presence of three 

 genital tubes instead of one on each side of the mesentery, since in 

 both cases ih.Qj are of the same form, might also be taken as within 

 the possible limits of variation and growth. Upon comparing my 

 specimen with Theel's drawing (Plate XVII, fig. 2) I was impressed 

 with the different appearance it presented. Instead of the rather 

 scattered papilUe showing considerable inequality in size and the long, 

 broad, naked mid-dorsal space, as pictured by Theel's artist, my spec- 

 imen gives the impression of more nearly equal, more slender, shorter, 

 and crowded papillae. This impression is borne out by Theel's count 

 of 100 papillae on each side of the back, while I found about 170, and 

 the length of the papillae, which he gives as 15 to 20 mm., while 10 

 mm. is the longest in my specimen. Thus, in respect to form and 

 distribution of papilla^, Theel's type is one extreme and my specimen 

 the other, with Ludwig's (Plate X, fig. 2) intermediate. The anterior 

 dorsal "transverse, thin, lobe-like extension of the skin, sending out 

 several processes" of Theel (p. 89) is probably represented by the 

 stiff- walled, heliotrope-purple colored papilhe, each with a base (1 mm. 

 in diameter) twice the width of the ordinary papilla and arranged 

 three on each side at the extreme anterior end, with an additional one 

 on each side in the line of the madreporic papilla. The two Polian 

 vesicles, with a common base in my example, may easiW be regarded 

 as a variation, as also the smaller size and lack of structure shown in 

 the madreporic papilla Avhen the latter is compared with Ludwig's 

 specimen. The characters of Sluiter's two specimens are in general 

 intermediate between those of Theel and Ludwig. 



11. STICHOPUS CALIFORNICA (Stimpson), 1857. 



June 20, 1903.— Two specimens; Station 4193; lat. 49-' 20' 30" N., 

 long. 123^ 35' 40" W.; 18 to 23 fathoms; bottom, temperature 50.3°, 

 green mud; fine sand. June 20. — Two specimens; Station 4197; lat. 

 49° 20' 34" N., long. 123° 35' 54" W.; 31 to 97 fathoms; bottom, tem- 

 perature 46.8°, sticky, green; fine sand. 



In these four small specimens (length 3.5 to 4.5 cm.) the gonads are 

 not developed, but the spicules and other characters agree so well with 

 what there is in the meager original description of Stimpson, 1857, and 

 the much better characterization of Clark, 1901, that I have little 

 hesitation in this determination. 



Habitat. — Tomales Bay, Pacific coast (Stimpson 1857). Pacific 

 Grove, California (Clark 1901a). Sitka (Clark 1902). Gulf of Georgia, 

 Vancouver Island, British Columbia {Albatross Alaska Salmon Inves- 

 tigations 1903). 



