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PYLOKIC i, LAND OF THE ASCIDIAN BOTKVLLUS. 39 



tin- cell neare-t to the lumen of the gland. One rarely sees more 

 than a single granule in a cell. Among these small granules are 

 larger ones, o to .8 /*. di-tingui-hed from them by being more 

 refractiv. In character they seem much like the brown con- 

 cretions found in certain blood cells (Fig. 18). However, these 

 concretion- < .mnot be found in the preserved material, so the 

 supposition i- th.it they are compiled of a material that is not 

 coagulate.! l,\ the killing lluid. this material being of the nature 

 nf ,1 secretion. The concretion- in the blood cell- are not ea-ily 

 di--olved b\ an\ ordinary reagents u-ed in micro-. -opic technique 

 therefore they .ire found in the piv-. r\rd material. 



At IVatifort the \\riter had the good fortune to be able to 

 examine the .impull.e of tin- H\ in- . 1 n;nr<><; inni stcllntiini , P, - 

 f)lit>r<i rt-riili*. JM ;<//</ Bp., N/\v/<; /;/;;.'.: and Mol-itla manhat- 

 IS. All had llagella in the pyloric gland. In . Inniroc ciiini 

 the llagella were -imilar to th.,-r found in liotryllns. In Pcro- 

 f>ln>ni -ome aminill.e \\ere like tho-r toimd in /v/ry///<.s 1 ig. 22), 

 but other- had ex< cedin^U |e\\ ilia \\hich \\ere direct, d io\\ard 

 the month of the tube and not av. in < 'handelou'- figure 



l g. 21 . Since the writer was able to observe movement in all 



the . ilia in thi- ampulla their direction can be determined to a 



tainty. 1'he \\alU of the ampulla- ..I houed no ,-- 



-riitial character dilleivnt from that of Hotryll;- \ : . [9 In 



the cells of the gland oi I i (I ; found the yellow secre- 

 tion iu-l as IM-I-I ile-ciibed it in M : and in the lumen of 

 the gland are tound globule- of it. In Mol^nln the organ is 

 t\pical I 5il main' diver-e lamilie- ot ascidians 

 -h..\\ tlagella in the luinrii "1 the p> loric gland, the writer believes 

 that i! carelullx lo,,k-d for tin- organ in all tnni.ate- \\ill be 

 found to bear llagella. 



The \\all- of the tubule- are -imilar to those of the ampulla- 

 except that the cell- are more cuboid ! and the tlagella 



shorter. N granules are to be detected in the lumen of the 

 tube- of Hotryllus >uch as l-ert found in the ducts of the pyloric 

 gland of Microcosm us, and a- the writer has tound in the ducts 

 of the gland in Stycld. 



When \\e compare the rectal tubule- with the other portion - 

 ..I the organ in Hotryllit* several things may be noticed. Among 



