116 PROCEEDINGS OP THE ACADEMY OF [1880. 



decreasing size (PI. XY, fig. Gcd) ; the fourth lateral plate, on 

 the tongue especially, with a small hook (fig. 7a) that is more 

 developed backwards, and in the four youngest rows is developed 

 quite (PI. XI Y, fig. IT) as in the three plates mentioned. On the 

 lateral parts of the pleuroe ten to eleven external (uncinal) plates, 

 the four to five interior (fig. 7, 8a6, 10 ; llbc) with a more devel- 

 oped crest, the rest (fig. lb) narrower. 



The salivary glands (PI. XY, fig. 11a) nearly as long as the 

 duct (fig. 116) ; both together about 5. ,5 mm. long, descending 

 along the whole back side of the bulbus pharyngeus ; the gland 

 whitish, smooth. 



The oesophagus rather long (6.5 mm.), and Avide especially 

 in the posterior part (diameter 2.0 mm.), entering into the inferior 

 part of the liver ; with rather strong and numerous folds ; the 

 contents (as in the intestine) spongiary masses and different Ba- 

 diolarise of a diameter of 0.09 mm. The intestine issuinaf from the 

 liver a little before the middle of the upper side of this organ ; 

 the anteriorly proceeding part reaching the anterior margin of 

 the liver and about 4.5 mm. long by a diameter of 1.5 mm. ; the 

 retrocessive part Y.O mm. long by a diameter of 0.75 mm. The 

 liver divided b}'^ a deep furrow from the right margin into two 

 halves of nearly equal size; 6.0 mm. long by a breadth of 3.75 

 and a height of 3.4 mm. ; the posterior extremity rounded ; the 

 anterior half of the inferior side obliquely flattened ; the color 

 yellowish-gray ; the cavity of the interior rather small. 



The pericardium of oval form, large, having the length of 

 3.5 mm. The sanguineous gland whitish, of the length of 2.5 mm. 

 by a breadth (at the anterior end) of 2.5 mm. The renal syrinx 

 short-pyriform ; the tube of the organ strong. 



The hermaphroditic gland not much developed, paler than 

 the liver, with large oogene cells. The anterior genital mass 

 small, about 1.5 mm. long by a height of 0.75 and a breadth of 

 about 0.5 mm. The ampulla of the hermaphroditic duct yellow- 

 ish, rather long, forming corkscrew-like windings. The sperma- 

 toduct not long, passing into the short penis. This, with its 

 armature of very minute hooks, the spermatotheca, the spermato- 

 cysta and the vagina, as far as could be determined, as in the 

 typical Triopa} The gland whitish. 



' See for comparison, PI. XY, fig. 13. 



