358 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 97 
In the lot from Bache station 10200 there is a subspherical Pelago- 
sphaera of a different species. The body wall is brown and opaque, 
the muscle bands (difficult to count) apparently not over 15. 
Type.—-U.S.N.M. No. 20612. 
Type locality—Key West, Fla., two specimens. 
Specimens examined.—In addition to above, one from Pelican sta- 
tion 193-10, latitude 33°20’ N., longitude 78°11’05’’ W., off Long 
Bay, S. C., 15 fathoms, March 8, 1940 (with eggs). 
Remarks.—This species belongs to the nudus-priapuloides section 
of Selenka’s key (1883, p. 13) except in the matter of longitudinal 
muscle bands, which are much more numerous than in any known 
species of Sipunculus. 
| The specimen from off South Carolina has 60 or 61 longitudinal 
muscle bands. The left ventral retractor origin spans muscle bands 
1-10 from nerve cord while the right spans 2-9. 
SIPUNCULUS GALAPAGENSIS, new species 
Puate 11 
Diragnosis.—Size large; body wall thicker than in S. nudus, with 
41 or 42 much stronger muscle bands; squamiform papillae of intro- 
vert larger anteriorly than posteriorly; papillose area not sharply de- 
marked posteriorly; tentacular crown with very numerous small 
ultimate divisions, the two dorsal clusters obviously larger than the 
five others; longitudinal muscle bands with thin, lobate, dorsal crests 
adjacent to base of long slender nephridia; brain with a conspicuous 
cerebral organ; no spindle muscle. Related to S. multisulcatus W. 
Fischer. 
Description.—Length (considerably contracted) 320 mm., introvert 
30 mm.; thickness of cylindrical body, 15 to 22 mm.; of collar behind 
tentacles, 10 mm. Longitudinal muscle bands 41 or 42; muscle 
annuli about 170. Posterior extremity blunt, apparently not normal. 
Introvert is closely covered with posteriorly directed, blunt, leaflike 
papillae, which are larger anteriorly, although the reverse is commonly 
the case in Sipunculus. The longest are 1.5 mm. There are about 
seven primary bunches of tentacular lappets; the two dorsal, which 
are branched, are much larger than the two lateral and three ventral. 
Back of the tentacles is a narrow zone free of papillae at the anterior 
margin of which, between the two dorsal groups of tentacles, is a 
conspicuous crescentic pore with an anterior valvelike lip. The anal 
aperture is 25 or 26 muscle rings behind the posteriormost introvert 
papillae, while the nephridiopores are nine rings in front of anus. 
The skin-canal system is not apparent from outside as the cuticle is 
separated from skin owing to sojourn in a fish. 
