102 THE LEECHES OF MINNESOTA 



is slender and distinctly differentiated from the stomach. At least six 

 pairs of well marked, long and slender gastric caeca are developed, 

 arising in somites XIV to XIX inclusive. Unfortunately they are 

 empty and shrunken and on account of the numerous gland cells which 

 fill the region difficult to see clearly, but they are certainly somewhat 

 branched and extend far toward the margins of the body. Those of 

 the last pair are long and reflected and extend as far as XXII, 

 lateral branches arising in each intervening somite in the characteristic 

 glossiphonid fashion. The intestine is a narrow tube which gradually 

 tapers to the anus and shows the differentiations usual in the higher 

 glossiphonids, including four pairs of prominent slender c?eca which 

 arise in somites XX to XXII and lie dorsad of the last pair of gastric 

 caeca. The first two are bent forward, enlarged at the end and some- 

 what subdivided, the third is bent backward and slightly lobulated and 

 the last is simple and directed rather strongly caudad from its origin. 

 The anus is situated at the posterior margin of XXVII, in this case 

 within the limits of that somite. 



Very little of value can be made of the internal genital organs. 

 The testes are not certainly discernible. There is a pair of short wide 

 sperm sacs crowded with spermatozoa extending from the posterior 

 limit of somite XIII to a point just abreast of the male bursa, where 

 they pass into the narrower ejaculatory ducts which curve around the 

 anterior face of the bursa toward the median plane and then bend dor- 

 sad and caudad to the summits of the prominent nearly spherical 

 prostate cornua. The latter open on each side into the dorsum of the 

 small bursa. The ovaries are enlarged pyriform bodies which lie 

 rather widely separated just caudad of the sperm sacs ; from their 

 anterior enlarged ends narrow oriducts pass mesiad and slightly 

 cephalad to the female orifice. The external genital orifices are sit- 

 uated in the positions usual in the higher Glossiplwnidcc, the male 

 at XI/XII, the female approximately at XII ctj/aj. Nephridiopores 

 are quite easily distinguishable on the post-clitellal complete somites 

 just anterior to the sensillas line on annulus &J and well mesiad of 

 the margins. 



According to the label the Minnesota specimen was colored green 

 during life. It was pumped from the bottom of Lake Pepin. Nothing 

 is known of the habits of this leech. 



