169 
This colony, 17 cm. long, is fixed to a basal plate. The first 10 cm. are straight; the 
rest is curved into three fourth of a vertical circle. The basal diameter of 545 y. increases to 
850 y on a height of 4 cm., to diminish further regularly towards the broken top (195 y.). The 
first 6 cm. are covered with polyps: the rest is devoid of polyps. — The cross-grooves between 
the polyps are clearly visible as well as the longitudinal groove along the back of the axis, even 
at the base. For the greater part the polyps are arranged in a single series, but at the base 
this series is curved and irregularities occur, which reminds me of a young Eucirripathes- 
specimen rather than of a Stichopathes. At the base two polyps a 
are situated even on opposite side of the axis, but a torsion A \ J \ 
is not impossible. The tentacles (figs. 243, 244) are very long, 
thin and transparent; the coenenchyma is also very thin. The 
interpolypar distance is 1.1 mm.; the oral cone is cylindrical, 
but somewhat sagittally elongated with a flat upper side; longest 
Fig. 242. Eucirripathes musculosa van. Pesch. 
diameter: 0.55 mm., shortest one 0.35 mm., height: 0.35 mm. spines on opposite sides of the axis; 58.5 X- 
The mouth is sagittally elongated. Sagittal tentacles 1.75 mm. 
long, lateral ones ± 1 mm. However this length may be very variable; especially at the base 
of the colony very long tentacles may be found; the lateral ones may attain a length of even 
2 mm. Usually the tentacles are entangled into an intricate greyish white mass. The spines 
(fig. 242) are in the basal part arranged in ± 8 longitudinal rows, alternating in a rather regular 
Fig. 243. Eucirripathes musculosa v. Pesch. Polyps 
in oral aspect; i6X- 
Fig. 244. Eucirripathes musculosa v. Pesch. Polyps 
in profile; 16 X- 
quincunx, with a mutual distance of ± 315 y; on the higher parts there are 6—7 longitudinal 
rows. — The length of the spines is different on opposite sides of the axis: 150 y and 7 5 A 
The top-half of the spines has a slightly granulated surface, while the shorter spines are almost 
entirely smooth, except the ultimate top. The shape of the spines is blunt, conical, at right 
angles with the axis; the sides of the smaller spines are often slightly concave. I he species is 
in many points very like Stichopathes variabilis and it is found on one of the stations of its 
var. longispina. But i. a. on ground of anatomical differences (cf. the anatomical part) I have 
kept this species and Stichopathes variabilis apart; also the exterior of the polyps, i. a. the 
oral cone, is rather different. 
Diagnosis: 
Colony: non-spi rally curved; regularly increasing and afterwards 
diminishing’ diameter. 
o 
Spines: blunt conical, at right angles with the axis; smaller spines with 
SIBOGA.-EXPEDITIE XVII. 
