Sense-Organs in Malacobdella

• DOI: 10.1038/135792a0
• Publication Date: 2008-01-02T16:03:07Z
• Authors: L. H. JACKSON

WHILE examining living specimens of Malacobdella grossa, Mull., under a binocular dissecting microscope (the specimen being extended under a glass slide in sea-water in the usual manner), I noticed a pair of minute structures on the head, which, so far as I can trace, do not correspond to anything previously described in this species. Fig. 1, drawn from a living specimen, shows these organs anterior to the cerebral ganglia, which send a small nerve in their direction. They have the appearance of small pits on the dorsal surface, suggestive of sense-organs. They are unpigmented.