172 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



Macrobdella decora, (Say) Verrill. 



Hirudo decora, Say (1824). 



Hirudo decora, Leidy (1868). 



Macrobdella decora, Verrill (1872). 



Thirty-six adults and several young specimens in the collection possess the 

 markings and general form peculiar to this species. In size, there is considerable 

 variation, the largest specimen being 120x18 mm. The body is rather long and 

 narrow, soft and limp. Dorsally the ground color is some shade of olive green, 

 with conspicuous red and black dots metamerically arranged. The male and 

 female genital pores are separated by five annuli and posterior to the female pore 

 appear four openings which are arranged in a quadrate figure. These are the 

 openings of the copulatory glands. 



This form was usually found free in channels, ponds or bays and also clinging 

 to sticks or stones. 



Genus Haemopis, Savigny. 



Among the Hirudinidae examined there are two species of leeches with the 

 mottled or sooty gray colour characteristic of this genus. There is no appearance 

 of metameric arrangement in the blotches. Especially in the contracted speci- 

 mens, there is a noticeable angle in the posterior half of each annulus. 



Haemopis marmoratis, (Say) Moore. 



Hirudo marmoraia, Say (1824). 



Aulastomum lacustri, Leidy (1868). 



Haemopis marmoratis, Moore (1901). 



Twenty-one specimens have been assigned to this species. Size 40 to 90 mm. 

 in length and 8 to 11 mm. in breadth. The colour in a majority of cases is dark and 

 mottled or almost black, but in a few instances the ground color tends toward 

 light grey. The angle in the posterior half of each annulus is quite prominent 

 in this species and the body is more rounded at the margins than in H. grandis, 

 the other species collected in this district. 



These specimens were taken from the lower sides of stones in small bays or 

 channels or from water plants. 



Haemopis grandis, Verrill. 

 Semiscolex grandis, Verrill (1874). 



Six specimens were identified as belonging to this species. Size large, 100 

 to 160 mm. long and 20 to 30 mm. wide, in the contracted condition. Colour dorsally 

 slightly mottled, greenish-grey, ventrally plain. Lateral angle sharp; the male 

 genital pore, twenty-four rings posterior to the mouth. 



Dissection showed eleven pairs of testes, though ten pairs appears to be the 

 more usual number (Moore, 1912). The gastric caeca in the specimen dissected 

 were much larger in both dimensions than in the small H. marmoratis. 



