PLATE VII. 



Mesenchytrceus grandis sp. nov. 



Fig. I. Section through the sperm-sac. _^er?V., peritoneum ; w., muscular 

 lajer ; e/., epithelium. 



2. Section through the lower part of the sperm-duct and the penial 

 bulb, at.gl., prostates opening into the atrium (the ducts of the 

 atrial glands are seen to pass down into the lower part of the sperm- 

 duct); d.at.gl., ducts of the prostates ; pb., penial bulb ; p-gL, penal 

 glands (all are inside the bulb). 



3, 4. Common lymphocytes. 



5. Eosinophil lymphocyte. 



6. Cyanophil lymphocyte. 



Mesenchytrceus kincaidi sp. nov. 



7. Section through the body, somite xii, passing through male-pores. 

 There is only a small penial chamber inside the bulb, but no atrium 

 in the same sense as in some other species of this genus. There 

 are no penial glands inside the bulb, nor are there any atrial glands 

 opening into the sperm-ducts. 



Mesenchytrceus soUfttgus Emery. 



8. Section through the penial pores and bulbs, atr., atrium of the 

 sperm-ducts ; ac.gl., accessory glands opening at the apex of the 

 penial papill?e ; these glands do not enter the penial bulb. The 

 black part of this figure represents the body-wall strongly charged 

 with pigment granules. 



(140) 



