164 CAMFORNIA ACADEMY OF SCIENCKS. 



toward.s iiiul aruiiml a .small cuiicavf pit or j^rouve in the (jiiLer udge of the oi»iilcriui.s 

 (fig. 10.-)). 



A. Int. ridf ((I tiioi' I a lie r cells arc ^Imi'lcr aii<l lliickcr ccIU, indicated asi in the 

 above figure. 



Exterior to these, the regular and eliaracteristic luhorcida pubertati.s cells 

 proper are .seen nnnieron.s unicellular gland?^, the same a.s the goblet cells of the 

 epidermis. 



In addition to these glandular cells, I find at certain intersal-a few sense cells 

 opening out into the narrow pit or groove just referred In. They are everywhere very 

 few in number, tall, narrow, with now and then the tip projecting through the cuticle 

 into the shallow pit (fig. lOo.^. r. /. ) There is not a continuous row of these cells, but 

 here and there are found iMinchesof half a do/en cells, opening close together. They 

 do not seem strictly parallel, but bulge and diverge in such a way that in sections, 

 which .show the common cells parallel, rarely more than one single sense cell is in 

 view to any great part of its length. This, together with the small number of these 

 cells, is undoul)tedly the reason why they are frequently overlooked. 



In connection with these sense organ cells, f have re-examined the ventral 

 papiihe found in Arglloj/hi/ua mariiioratim, and I find that these structures are really 

 nothing but tubercula pubertatis nature, or at least sense organs furnished with .sense 

 cells, a description of which will be deferred to a future paper. As a general con- 

 clusion, I may state that the tul)ercida pubertatis are really sense organs, furnished 

 with sense cells of the same nature as those found in other parts of the epidermis, and 

 descril)ed by me in Benhamia, and by Vejdovsky in Rhyntdielinis, by Cerfontaine 

 and Langdon in Lumbricus, by Hesse in Lumbricus and Allolobophora, etc. 



Septa. The septa are not all of the same thickness, neither is each individual 

 septum of the same thickne.ss throughout. The first distinct sei)tum is found bi'lween 

 iv/v. It is of regulation thickness, or as thick as septum x xi and those f(dlowing 

 posteriorly. The anterior septa increase in thickness forwards and backwards in such 

 a way that septa vi vii, vii/viii are of about e(puil thickness, while those in front and 

 behind these are thinner in proportion as they are more distant. The anterior five 

 septa are much thicker in their cenlial area, and thin out towards the periphery and 

 body-wall, l)ut even then, at the thinnest part, they are about four times thicker than 

 the posterior septa. The six anterior septa do not strictly correspond with the .seg- 

 ments, but are attached to the body-wall about one-fifth the distance forward from the 

 posterior intersegmental groove. 



Siiprapharyuyedl and f^eptal glnndx. The glandular mass superjiosed on the 

 pharynx and opiniing into it, is prominent, but situated far back, and with its lobes 

 pointing forward, or in the same direction as the septal glands. The opposite is gen- 

 erally the case, and has l)een so in all other species examined by nie. 



Longitudinal sections show that tlu' regular septal glands are jiresent in three 

 somites. The most anterior pair is in iv, immediat(dy behind the supraphary ngeal 

 glands, and not separated from the latter by any septum. The other two pairs are in 

 v and vi. In longitudinal sections the su[>raj)hary ngeal glands are seen to be com- 



