190 
only ovaries developed, in ihe underniost part there were only 
testes (compare Pachycerianthus plicatns). The p.-mesentenes were 
Sterile. 
6. 1 sarachnanthus panamensis n. sp. 
Diaanosis: A rather small species. Marginal and labial tent- 
® • 1 _rtKrvllf 'XO 
acles of ordinary length. Number of marginal tentacles about 32 
Arrangement of marginal tentacles in three or four cycles 2 (dt 
431 1 4231 I 4231 . or 2 (dt) 331 j 3231 1 3231 ^ ° 
the labial tentacles 2 (dt) 413 1 4243 1 4322? Only two labtal tent¬ 
acles the third from the directive tentacle, of the first cycle. Actin- 
opharynx of ordinary length, hyposulcus longer than half the actm- 
opharynx, with cnidoglandular tract, indistinctly limited and wtth 
one ciliated streak on each side. 16 mesentenes attached to the 
very broad siphonoglyph. Hemisulci very short. Directive mesent- 
eries of about the same length as the hyposulcus so^nev/hat 
longer Pa, M, m, B and b as in I. bandanensis. Ps and the older 
B and b of the same length as the directives or somewhat longer. 
No distinet limit between the ciliated tract and the craspedion 
region. Craspedion region broad, but not invaginated in the middle 
line. Acontoids with fewer large nematocysts than in I. banda¬ 
nensis, but with more numerous giand cells. For the rest as in 
I. bandanensis. „ Jn. 
Colour: Three specimens were almost uncoloured, on 
side of the marginal tentacles there were traces of several pale, 
yellow-brown transversal bands. The column of the fourth spec- 
inien was red-brown, the bands of the marginal tentacles more 
distinet than in the former specimens. 
Dimensions: In three specimens the column was very ex- 
panded, in one specimen (the mesenteries of which are repro uce 
in textfigure 15) more contracted. The smallest specimen was 3, 
cm long and 0,3 cm broad, the largest uncoloured specimen 7 cm 
long and about 0,5 broad, the red-brown specimen «bout 9 cm long. 
Occurrence: Taboga, Panama. Sand, low water. Febr. 
3 specimens. Dr. Mortensen’s Pacific Exp. 
The smallest specimen was provided with 20 margina ten a 
The marginal tentacles in the two other uncoloured specimens we 
32 resp. 27, the labial tentacles 30 resp. 26. The margina ten ac 
