43 201 



08 mm , and were of the before described form (comp. I. c. p. 305. Taf. XXXIX, Fig. 8), with 

 10—11 fine denticles (fig. 20). The very slightly yellowish lateral plates (figs. 2 b, 3) were 

 quite as before described, with somewhat obliquely rising, smooth-edged hook; the inner- 

 most ones and especially their hook were shorter, the hook then reaching by and by a 

 height of up to 0-14 mm ; the outermost ones were again shorter. 



The salivary glands formed as usual a whitish, felt-like mass, situated behind 

 the bulbus pharyngeus and surrounding the fore end of the first stomach. 



The oesophagus (fig. 1 a) was short, about 2 mm long. It passed, without any 

 distinct bound, into the first stomach (fig. 1 b), which was only little wider, about 

 4 mm long, also thinwalled, and on the inside provided with fine longitudinal folds. The 

 first stomach is on the upper side posteriorly quite covered by the two liver-branches of 

 the second pair of papillae; these branches join each other above, but are separated at 

 the base; they pass below in a rounded way into a quite short, thinwalled biliary duct, 

 opening into the hinder part of the stomach on each side ; further down to the left one 

 more opening is found of the quite similar biliary duct of the principal liver. Behind this 

 stomach, the second one, the grayish hook-stomach (fig. 1 c) is found; it was cylindric, 

 of a length of 6 — 7 mm , by a diameter of 3 mm , and through the muscular wall fine longi- 

 tudinal lines (the series of thorns) shone through. At least 18 such series were found, with 

 about 30 hooks in each series. The brown or reddish brown hooks had a height of 

 up to at least 0'65 mm ; they varied much in form, height, and thickness, as before described 

 (comp. 1. c. pp. 296, 306). This stomach is distinctly bounded , as well at the cardia as 

 at the pylorus, and set with hooks converging towards the middle. The following part 

 is perhaps to be interpreted as a third stomach; it has a length of 6 mm , by a diameter 

 of 4 mm ; its fore end forms on one side a little horn, in which the refolded upper end of 

 a strong fold begins ; this fold shines highly through in its whole course some way along 

 one side of the intestine; otherwise longitudinal folds are found in this stomach. The 

 intestine (fig. 1 e) is the immediate continuation of this stomach; it runs first backwards, 

 and then it turns upward; its length was about 10— 15 mm by a diameter of 2 — 3 mm . — 

 The stomachs and the intestine showed rather copious brown contents, formed of an 

 undetermined animal mass in which were found diatomées, cnidæ, and strings of eggs, 

 mingled with loose stomach-thorns. 



The two large liver-branches belonging to the second pair of papillae 1 ), have at 

 the base a thickness of 3 mm ; they are rounded below, with a quite short biliary duct open- 



The number of lateral plates in the series beside the median ones was in B. arborescens 8 — 11. 

 in B. digitata 13 — 14, in B. calcarata 11, and in B. excepta 17—11). 

 ') In the first pair of papillæ, coalesced with the rhinophores, no liver-branch exists. 



D. K.D. Vidensk. Selak.Skr., 6. Række, naturvidensk. og mathem. Afd. XII. 2. 26 



