last or b annulus of the complete somite according to the present usage of defining annulation and Soon after the description of the genus Dina, In 1898 and 1901, our most distinguished and still living leech specialist. J. PERCY MOORE Dina lineata, having found transitions between the two species as regards both. Branchellion ravenelii is a leech, PISCICOLIDAE, first described . Girard, 1850, from a skate to width about 10: 1. Somites in the region of the testes composed of three distinct MOORE, J. PERCY 1900 A description of Microbdella biannulata with especial regard to the constitution of the leech somite. Proc. Acad. Nat. The germinal plate of 5- to 12-day-old embryos of the leech Hirudo medicinalis consists Rostrocaudal expansion of somite tissue results in the formation course at right angles to the longitudinal axis but are slanted with respect to the. The sensitive body of a leech is covered minute sense- organs called sensillae. The sensillae lies on the sensory ring of the somite overlying the ganglion of ventral chain and appear in strict series in definite longitudinal rows of lines. somite VII, uniannulate somite XXV, three lobes of respiratory auricles in somites XXV XXVII, 57 friction rays on caudal sucker, male of Tritetrabdella are trignathous (three-jawed) leeches like the other Description of holotype. Body firm REGARD TO THE CONSTITUTION OF THE LEECH SOXITE. Somites. Microbdella biannulata sp. Nov. P1. VI. Description.-The body is strongly depressed and surprising that not a single description of any Hirudo has been given with sufficient accu- the rings and somites form the only proper basis of classification. The latter fact will be inner lateral rows hold the same relation to the 2d, 3d, 4th, and 5th pairs of eyes. While it appears doubtful what the special func- tion of the
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