THE HIRUDINEA OF GEORGIAN BAY 171 



SESSIONAL PAPER No. 39b 



seventh annulus, the dorsal surface is yellow and a yellow band passes around the 

 body in the region of the eleventh or twelfth annuli. Along the margin of the body 

 are yellow spots on the tips of the first and third annuli of the somite. In some 

 specimens there is a median dark brown line interrupted in some cases by yellow 

 patches. There are, usually, three series of papillae, but, in one specimen, five 

 were observed. 



As shown by dissection, there is a long looped oesophagus with a short pair 

 of oesophageal glands connected with it. The diffuse salivary glands attached at the 

 base of the proboscis, are of large size and stretch outward and backward, not 

 forward as in other species. In one specimen the stalk of the posterior sucker was 

 found to be quite long. In another specimen small bodies which appeared to be 

 spermatophores were found attached to the body. 



The specimens collected were taken from dredgings at a depth of from one 

 to six feet and from the lower sides of stones or clam-shells on a sandy shore. 



Placobdella picta, (Verrill) Moore. 

 Clepsine picta, VerriU (1872). 



In the collection there is only one specimen answering to the description of this 

 species. This specimen measures 29 X 5 mm. and is broad and flat in shape. The 

 dorsum is marked with numerous longitudinal lines of deep green. Verrill 

 describes this species as having a marginal series of yellow spots on the tips of the 

 first and third annuli of the somite. In the preserved specimen the presence of 

 these spots cannot be observed with certainty and the notes give no information 

 on this point. The colour of the ventral surface is a flecked green. In the living 

 specimen numerous papillae were observed on the dorsum. 



There are diffuse salivary glands present and the oesophageal glands are long 

 and similar in form to those of P. rugosa or P. parasitica. The oesophagus is almost 

 straight, not looped as in the other species of this genus. The seminal duct forms 

 a long loop connecting with the testicles anteriorly, much as in the species of 

 Glossiphonia. 



The single specimen of this species collected was found on the lower side of a 

 clam shell on a sandy bottom. 



Family Hirudinidae. 



Distinguished by the presence in most species of five pairs of eyes, a five- 

 ringed somite, three toothed jaws and a large mouth occupying the entire oral 

 sucker. There is no protrusible proboscis. 



These leeches are free swimmers and subsist upon the blood of animals or 

 upon weaker invertebrates. 



Genus Macrobdella, Verrill. 



Characterized by large size and the presence of metamerically arranged 

 black and red spots on the dorsum. 



