8 SVEN LOVEN, P:GHIN0L0«I(,!A. 



sacciilated, tlie ventral, /«/. 12, concave in tlie middle, exte- 

 riorly tliick and convex all aronnd, slightly swelling interra- 

 dially, and feebh" iiarroAved and plicated opposite tlie ambn- 

 lacra. Tlie anterior, cardiac terminatioii. n, near tlie 2, pro- 

 jects a little beyond the point A\'here tlie ffisopliagus, oes.. nar- 

 row and straight, descends ()l)liquely towards tlie centre of tlie 

 dental ajiparatus. ////. K), while at the other. the posterior end, 

 p. near II a, the i-eetuin. i\ abruptlx- contracted, ascends obli- 

 qnely towards the centre of the calycinal system, ////. 10, 11. 



I ani obliged to the kiiidness nf ]kliss Sigrid Andersson 

 for a (^ontinuous series of nnmerous vertical sections of this 

 iiitestine. as Avell as fov another series prepared with equal 

 skill, of horizontal sections of an eiitire yoimg aninial a little 

 niore advanced. From the first of these series the six sections 

 were selected whicli iifforded the /?//. 13 to 18. They show 

 that at this period the wall of the intestine, a thick and so- 

 lid cellulär mäss. encloses an utterly narrow lumen, its dorsal 

 and ventral portions being all but contiguous, leaving between 

 them a small open space along the sides only. In fHl- 1'^ the 

 prominent cardiac portion is seen, from which the opsophagns 

 proeeeds. and in /?'//. 17 the rectum goiiig oif from near the 

 posterior end. Aniong the horizontal sections one, fiij. l!h 

 shows the inner surface of the intestine and one of the me- 

 senterial bands; pff- -^^ f^ie opsophagns, and in the interval 

 between the two ends of the intestine, the aquiferous canal, 

 the ovoid gland, and the blood-lacunes in connection, fiff. 10, 

 11'''; fUf. 21 the rectum. The entire alimentary canal is empty 

 and functionless. 



When the intestine had been removed and the dental ap- 

 paratus brought into view, this was found far from being in 

 working order, fifj. 22. The pyramids are widely distant 

 from one another. and of each. tlie two halves. ''|'^\ while ap- 

 proaching adoralR', diverge ontwarris and at the same tinie 

 recline almost horizontalh' iipoii the inside of the test. fifj. 11, 

 22. Eacli half pyramid, ^^^ is a thick, oblong inass of reticular 

 tissne on the way of calcifying, produced adorally at its inner 

 margin. Between everv two of these halves is seen, interra- 

 dially, one of the five teeth, which in this aspect presents a 

 somewhat pear-shaped outline, its aboral part being broad. 

 convex and rounded. the adoral acuminate and marginall\' 

 spinons; it is smooth. and its homogeneous texture strikingly 



