Body wall of leech includes five layers:
i) Cuticle (outermost layer)
ii) Epidermis which lies below the cuticle
iii) Dermis which lies below the epidermis formed of connective tissue
iv) Muscular layer formed of circular and longitudinal muscles and
v) Botryoidal tissue lies beneath longitudinal muscles and fills the entire coelom around the gut.

(a) Mouth : It is located in the middle of anterior sucker.
(b) Anus : Anus is a small aperture that opens on the mid-dorsal side of 26 segment.
(c) Nephridiopores : Nephridia open to the exterior by 17 pairs of nephridiopores. They lie ventrally on the last annulus of each segment from 6 to 22.
(d) Male genital pore : It is a mid-ventral opening, situated between second and third annuli of 10^th segment.
(e) Female genital pore : It lies mid-ventrally between second and third annuli of 11^th segment.

i) The female reproductive system of rabbit consists of a pair of ovaries.From each ovary arises the oviduct.
ii) The anterior part of the oviduct is the fallopian tube which leads to uterus.
iii) The uterus join together to form a median tube called vagina.
iv) The common tube is formed by the union of urinary bladder and the vagina and is called urinogenital canal or vestibula. This opens into the exterior called vulva.
v) A pair of Cowper's gland and perineal gland are the accessory glands present in the female reproductive system.

(i) Leeches have internal fertilization.
(ii) Fertilization is followed by cocoon formation. 
(iii) Cocoon is also known as egg case.
(iv) Cocoon is formed around the 9^th, 10^th and 11^th segments.
(v) Cocoon contains one to 24 embryos.
(vi) Development of young one is direct. 
(vii) Young leech resembling the adult emerges.

(i) There are eleven pairs of testes, one pair in each segment from 12 to 22 segments.
(ii) From each testis arises a short duct called vas efferens which join with the vas deprens.
(iii) The vas deferens becomes convoluted to form the epididymis or sperm vesicla, to store spermatozoa.
(iv) The epididymis leads to a short duct called ejaculatory duct.
(v) The ejaculatory ducts on both sides join to form the genital atrium.
(vi) The atrium consists of two regions,
a) Prostate glands and
b) Penial sac.
(vii) Penial sac consists penis.
(viii) Penis opens through the male genital pore.