KUNGL. SV. VET. AKADEMIENS HANDLINGAR. HAND 47. .VO |. 29 



The intestinal spiral is composcd of about 24 double turns, and is free posteriorly 

 but in posscssion of a spindle-shaped muscle (fig. 71). In front attached bo fche 

 postcrior part of the oesophagus, therc is to be observcd a fixing muscle. The in- 

 sertion of the rectum is strenghthened by strong inusclos. A small divertiole is pre- 

 sent. Though I have been unsuccesful in searching for a contractile vessel along the 

 oesophagus, it cannot be doubted that such a tube really exists. 



As to the external appearance the species in question seems to present a certain 

 resemblace to Phascolosoma flagiferum of Selenka, 1 but on account of several important 

 distinguishing characters they are to be kept apart. 



Phascolosoma ohlini n. sp. 



Pl, II, tigs. 21—23. Pl. III, tigs. 24—27 and PI. V, tigs. 69 and 70. 



Habitat. — South Georgia: »Maj viken», 75 in., clay with alg», u /s 1902. 

 Two specimen. — »Grytviken», 24 — 52 m., clay with algoe, 21 /s 1902. Two specimens. 

 — North of Astrolabe Island: 63° 9' S.— 58° 17' W., 95 m., clay mixted with 

 sand, stones and algse, 28 /ia 1902. One minute specimen. 



Total length of the body 16 or 17 mm. Body elongate, subcylindrical, ivilh the 

 posterior extremity pointed. Tentacles slender, 16 in number, arranged in groups on 

 each side of the median line. Distinct ciliated sense-pads present, separating the dorsal 

 tentacles. Skin whitish, shining with small cylindrical papillaz, crowded at the posterior 

 extremity of the body and scarce at its middle. Behind the tentacles mammillary wart- 

 llke papillaz and scattered hooks, both directed backivardly. Two free segmental organs. 

 Muscular layers of the body-wall continuous, not separated into bands. Two ventral 

 and two dorsal relractors. Intestinal spiral composed of about 14 double turns and not 

 attached posteriorly. 



The papillse of the body-wall have in general a cylindrical form and are crowded 

 at the posterior extremity (figs. 25—27), while they are much scattered at the middle 

 of the body (fig. 24). Towards the proboscis they increase again in number as well 

 as in size. Behind the tentacles they have become changed in form, presenting 

 themselves as rather prominent rounded mammillary warts, having their tops directed 

 backwardly (figs. 22 and 23). The hooks scattered among them are strongly curved 

 and have the same direction. 



As to the arrangement of the tentacles, it deviates considerably from that of 

 the preceding species. Their number is 16 and they form two groups, one on each 

 side of the median line. In the small specimen from Astrolabe Island, 6 mm. long, 

 there are only 9 or 10 tentacles. On the dorsal side the two groups are widely 

 separated, the ciliated sense-pads having occupied the space between them. Those 

 pads are separated by a deeper furrow, and each of them is divided in two by a 

 shallow groove (fig. 69). 



1 Report on the Gephyrca. Challenger Report. Zoology. Vol. XIII, 1885. 



