\>TEROPI1ILA. IOI 



and tin.- neighborhood of the accessory reproductive glands in the 

 \ en t nil part of the visceral mass, and by means of another smaller 

 branch t.ikes the blood from the kidney. The aorta is very -hort 

 and leads directly into what may be termed the head cavity, the 

 large space surrounding the pharynx. From here numerous 

 1. ranch'- .\tend into the pseudopallium, liver and between the 

 oxarian lollieles. Of these the ones pa--ing through the pseudo- 

 palliuni probably function in the interchange of gases as there 

 are no trai es of ctenidia or branchia. 



One nephridium I'l. I., Fig. 2, n) is pre-ent in the form of a 

 iil\ on i pressed sac covering the anterior surface of the 

 visceral ma on the right-hand side. Its inner wall- are often 

 pi<. \idrd \\ith lamelke or folds, of varying >i/-. projecting into 

 ihe rcniral lumen. The cells throughout are highly vacuolated 

 and contain \arying quantities of some granular secretion that 

 in >ome locaiions present the form of concrements. \\ V have 

 lut n unable to definitely locate any clearly defined ivno-peri- 

 aidial opening. As shown in 1M. 11.. Fig. 6, ;/, the kidnev 

 in\e-i- tin dorsal pericardia! wall but there are. so tar as we 

 lia\e seen, no modified cells indicating a nephro-tonie. Tlie ex- 

 ternal pore I'l. I., Fig. 2, e') is situated on the anicrior lace of 

 tin visceral mass immediately below the margin of the maiulr. 



\\ liilc the ganglia are fairly well denned and distinct tin- nerve 

 liber- n M inble so closely the connective tU-ue and IHIIM le 

 bundle- tlii-on^li \\hich they make their way that it i- \ ery dif- 

 in nit to determine their course. The cerebral iIM. I., 1 i:^. I,D, 

 appan-nil\ a ociated with the pleural, are. in the type -periim-u, 

 -ilnated in an asymmetrical position, beinv; placed mi the ri-ht 

 >ide ot the pharynx. From this nerve ma-- connectives extend, 

 on each r-ide o| tlu- phar\ nx, to the pedal uan^lia. large, clo-ely 

 appn---i-d ^ioup> of ner\'e cells placed -\ninietricall\ \\ith refer- 

 ence to the mid ventral line. The cerebral uaujia likewi-e 

 originate buci\il connectives that, extending along the phar\u\. 

 unite \\ith ganglia imbedded in the >a!i\ar\ gland- on the dor-al 

 and \entral -ide. The buccal ganglia are further united by t\\o 

 c.pinmi ure- that lorm a collar about the pharynx. In the 

 neighborhood i.|' tl,. opening of the repn>diicti\ e -\-tem into 

 the pseudopallium there is a large ganglion. probabK the visceralj 



