proportion between the length of the tentacles, show an other proportion than Stick. Richardi R. 
While the proportion between the sagittal and the lateral tentacles in the latter species is 1.50, this 
value is in Stick, abyssicola 1 : o.6( 0.5) — nearly 2. — The colonies are K courtes et grGes’’ but 
this is not entirely right, compared with Stick. Richardi R., for the length of abyssicola is much 
less (± 0.25 m.) while the diameter is 0.4—0.8 mm., so that the colony is rather thick and in any 
case not extremely thin. In my opinion Stick, abyssicola R. is not so much like Stick, filiformis 
(Gray) Brook as Roule believes it to be, as is remarked by Silberfeld already. The spines 
of Stick, abyssicola R. are almost twice as small, twice as crowded, in twice the number of 
longitudinal rows, and they are in a rather high degree distally inclined, while the spines of 
Stick, filiformis are at right angles with the axis or nearly so. — I would be more inclined 
to put Stick, abyssicola R. in the neighbourhood of Stick, desbomii. differing in not havino - its 
spines in verticils. But Pourtales’ figures do not allow to form conclusions with certainty. 
It is lemarkable that the growing in groups, which is mentioned for Stick, desbomii , seems to 
occur also in Stick, abyssicola R. (cf. Roule’s specimens of station 1116; 14 p. 65). The likeness 
remains very vague however. 
Diagnosis: 
Colony: short, slender, curved, some dm. long, sometimes growing in groups. 
Spines: distally inclined, convex proximal side, concave distal side, acute, 
smooth (?); 200—250 [j. long; mutual distance 830 y; 4—5 longitudinal rows. 
Polyps: small and delicate, not very conspicuous; long, thin tentacles, with 
a radiate arrangement; sagittal tentacles 1 mm., lateral ones 0.5—0.6 mm.; inter- 
polypar distance 2.5 mm. Mouth transversally elongated. 
S. S tic hop a the s flagellum Roule. According to Roule this species approaches Stick, 
occidentahs (Gray) Brook, but differs from it, by Stick, occidentalis having a thinner axis, a 
less regular arrangement of the spines with not so regular longitudinal rows as in Stick, 
flagellum R. and sometimes an inclination to have the longitudinal rows wound in a dextrorsal 
spiral lound the axis. In my opinion the differences between both species are greater than Roule 
indicates, since they diverge rather much in length and in the mutual distance of the spines. 
While I have joined Stick, occidentalis to Stick, gracilis (Gray) Brook, I am inclined to keep 
Stick, flagellum Intact as a species. — I would rather see a likeness between Stick, filiformis 
and Stick, flagellum , for both have the same shape of the axis, viz. slender, filiform, every¬ 
where of equal diameter, but the dimensions of the spines are too different. The diagnosis of 
Stick, flagellum R. is: 
Colony: very slender, whiplike, everywhere of equal diameter, curved; 5_ 
6 dm. long with a basal diameter of 1.2 — 1.3 mm. 
Spines: small, conical, in 4—5 longitudinal rows, alternating in a quincunx; 
length: 130 y. (according to Roule’s pi. VI, fig. 4 c, this length occurs, while Roule 
gives 50—60 y. as an average) 1 ); mutual distance 230 y.. 
1) Usually in the diagnosis I give the greatest length of the spines on the colony since otherwise the average length of the 
spines might be entirely different for a fragment of a colony or for a complete colony. 
SIBOGA-F.XPEDITIE XVII. T - 
