NO. 1658. NOR TH PA CIFIC HOL THVRIA NS—ED WA EDS. C 5 



12. STICHOPUS CHALLENGERI (Theel), i886. 



Jul}^ 7, 1903.— Three specimens; Station 4230; hit. 55^ 35' 13" N., 

 long. Isi^ 50' 11" W. ; 108 to 240 fathoms; bottom, temperature 4:2 A \ 

 roclv}'. August 14. — One specimen; Station 4289; Uyak Bay, Kadiak 

 Island; 74 to 80 fathoms; bottom, temperature 42.2°, gray mud. 

 Augustlo.— One specimen; Station 4291; lat. 57^45' 0" N., long. 154° 

 2' 30" W.; 48 to 65 fathoms; bottom blue mud, sand, gravel. August 

 15.— One specimen; Station 4293; lat. 57-45'0"N.,long. 154°12'0"W.; 

 106 to 112 fathoms; bottom blue mud, fine sand. 



The study of these six individuals of Stichojms chaUengeri., which 

 Theel described from "a single slightly macerated specimen," gives 

 an opportunity to add a few things to the admirable description of 

 that author. It is of interest that TheeFs specimen, found in lat. 46° 

 53' S., long. 51° 52' E., gives the two regions now recorded for this 

 species on opposite sides of the earth. 



Body. — Size in centimeters: Length, 5.1 to 18.8; average, 12.3; 

 dorso-ventral diameter, 1.2 to 2.3; average, 1.8; transverse diameter, 

 2.0 to 3.2; average, 2.7. 



Color. — In alcohol; three specimens brownish drab dorsall}", shading 

 to light hair brown, or white, ventrally; the other three heliotrope- 

 purple dorsall^y, shading to lavender ventrally. 



Tentacles. — Nonretractilc; four specimens with 20 and two with 19 

 (Theel's example had 19). Color cream-buH". Ampulhe extremely 

 short, the longest being 3 mm. 



Genital jxipilla. — Inconspicuous, at most 1.5 mm. high, 0.5 to 1.4 

 cm. from base of tentacles. 



Pedicels. — Ventral, nonretractile, white, with cream-color ends. 

 Three specimens have two rows the entire length of the ambulacra. 

 In one specimen the two lateral ambulacra have two rows and the mid- 

 ventral is parti}' with two and partly with four rows. The other two 

 specimens have four rows in the mid-ventral ambulacrum in the middle 

 of the bodv. This increase in number of rows is obvious!}' due to con- 

 traction and is of interest in relation to TheeFs description of the 

 '' median series, composed, apparently, of about four rows of pedicels 

 on the posterior half of the body; anteriorly the odd ambulacrum 

 carries only two rows of pedicels." 



Paplllx. — Dorsal, usually the most anterior are longer and form a 

 fringe projecting in front of the body. Length, 0.6 to 1.7 mm.; 

 average, 1.1 mm. 



Color. — Stalks, like bod}"; some of the ends, white. 



Body vxill. — Rough, 0.1 to 5.0 mm. thick; average, 2.2 mm. 



Spicules of the lody icall. — In addition to the structures described 

 by Theel, occasionally the four-rayed forms have the ends of the rays 

 joined to make perforated disks of tables. 

 Proc. N. M. vol. xxxiii— 07 5 



