columnai is, while the oral cone is different in shape. — The very regular arrangement of the 
pinnulae in numbers of. three and some deviations in polyps and spines, are an objection to 
identify this specimen with Pa ran tip a thes lanx , although both forms are near relations, so that 
perhaps the Siboga-specimen is only a variety, as more extensive material might demonstrate. 
Diagnosis: 
Colony : Stem bears 6 rows of straight or slightly curved pinnulae in 
groups of three, alternating regularly (cf. fig. 104). Angle of insertion 
67.5° or more. No worm tubes. 
Spines: 3—4 longitudinal rows; length io and 55 p. ; mutual distance ± 
255 p; smooth, triangular, distal side at right angles with the axis. 
Polyps: Ditto as in Par. columnaris. Tentacles: length 525 p.. Interten- 
tacular distance (on the pinnulae) 2.75 mm. Oral cone elongated transversally. 
On the stem: mouth round, oral cone domeshaped, slightly elongated; 
tentacles knob-shaped. 
Cirripathes (Br.) emend. 
I st Subgenus Stichopathes Br. 
CRITICAL REVIEW OF THE KNOWN SPECIES. 
Out of the large number of species, described by other authors, I have retained 
the following species, after having combined many species, basing on the given descriptions. 
However I do not mean to say that the identification is irrefutable. The principal aim is to 
get a survey of the wellnigh unmanageable material, collected untill now. A full list of species 
is given by Silberfeld, wTerein only Stichopathes gracilis Gray var. a. Sch. is lacking. 
1. Stichopathes gracilis Gray, to which I joined Stichopathes pourtalesi Brook; Sticho¬ 
pathes gracilis Gray var. spiralis T. & S., var. a Schultze, Stichopathes occidentalis Gray; 
Stichopathes echmulata Brook; Stichopathes indica Schultze and Stichopathes setacea Gray. 
The type of Stichopathes gracilis Gray has a slender, sinuous stem, which, according 
to Brook, is never wound in a spiral, but, according to Schultze, is partly a spiral, while 
Johnson (9) finds an irregular loose spiral in two specimens. The stem is 2 m. long with a 
basal diameter of 2.5 mm. The spines are arranged in 6—9 longitudinal rows, + 200 u. long, 
with a mutual distance of 600—1000 p. ; they are inserted at right angles with the axis, 
triangular in shape and sometimes forked at the top; surface: rough. 
The polyps are not described, since they are dried. Stichopathes pourtalesi Brook 
deviates from Shell, gracilis Gray in the shape of the colony and in some characteristics of the 
spines. Its colony is a sinistrorsal or dextrorsal spiral, while the spines are arranged in 5—6 
longitudinal rows, over 75 p. long, at a mutual distance of 600—1000 p.; their apex is sometimes 
forked, which may even pass off into a doubling of the spines. The shape of the spines is at 
one time conical, at another triangular, so there is no great choice between them. These 
SIBOGA-EXPEDITIE XVII. 
14 
