102 



JOHAN KIÆK. 



P*o. 9 



line, upon the highest part of the animal; the fonner i 

 situated upon a short siphon, the latter, on the contrar} 

 upon an unusually long one, which is sligthly bent forwar- 

 (fig. 38). When living, and extended, this is said to hav 

 been the length of the body ; in the spirit specimen, examine 

 by the author, it measured 7 mm. This long, naked, sewe 

 siphon, is the most peculiar part of the whole animal: Th 

 testa, on the siphon is so thin, that the strong, ring muscle 

 are plain to be seen, so that, at the first sight, one migl 

 think he was looking at a Nereis, or some other little amieiit 

 sticking out of a ball of sand. From each of the opening 

 there radiate numerous longitudinal muscle bundles, whid 

 upon the siphon, are closely situated, but, farther dow: 

 spread out more or less. and, at a distance from the basis i 

 the siphons of a little more than 73 of the length of the bod 

 suddenly cease. On the siphons there is a strongly developt 

 ring muscle system, which, especially upon the sewer sipho 

 together with the longitudinal bundle of muscles, lying insid 

 form a beautiful network. Below the basis of the siphor 

 the circular muscle bundles disperse into numerous, shoi 

 bowed muscles which lie irregularly arranged in long rov 

 upon the front and backside of the body; these rows dimini 

 in strength downwards, but, however, me et on the undersi» 

 of the body, whilst, on both sides, they leave a small spa 

 for the muscles. 



There are about 15 tentacles, sbrongly pinnatified, alternate 

 large and small; 5 — 6 very large. The dorsal fold doub 

 low, the edge straight ; this runs part the swallow, on its 1< 

 side, and disappears by the second branchial fold. The dor: 

 tubercle with horns, the opening between these turns bac 

 ward. The nerveganglie lies close behind the dorsal tuberc 

 not directly in the middle line, but a little to the left. T 

 branchial sack, with 7 folds on each side ; The folds have t 

 following number of internal, longitudinal bars from ti 

 endost^de, 4, 5, 5, 5, 6, 6, 5. The stigmata generally long, b( 

 (fig. 40). In each mesh 2 flat infundibula in the fold. T' 



