122 Proceedings of the Royal Physical Society. 
EXPLANATION OF PLATES V. AND VI. 
Prate V. Calliobdella nodultfera.—Transverse sections through various portions of the 
abdomen. A. Through the anterior part of the testis region. 6. Through the middle 
part of the testis region. ©. Through the posterior part of the testis region. 
D, Through the anterior part of the cecum region. HZ. Through the middle part of 
the caecum region. F'. Through the posterior part of the ceecum region. X. The body 
wall, containing the whole of the layers shown in Plate VI. St. stomach ; C. ceecum ; 
R.V. respiratory vesicles; D.V. dorsal blood-vessel; V.V. ventral blood-vessel ; 
DS. dorsal sinus; V.S, ventral sinus; L.S. lateral sinuses ; J.S, intestinal sinus ;— 
Int. intestine ; N.G. nerve ganglion ; N.C. nerve cord, aS 
Puiate VI. Oalliobdella nodulifera.—Longitudinal section through the body wall, viewed 
under a high magnification, from a preparation stained in Hemalum, 5 min., Eosin, 
5 min. Out. cuticle; Hp. epidermis ; S. epithelial mucus gland ; Fibr. L. fibrous cell 
layer; D.C. large subdermal cells; P. yellowish-brown pigment cell; M.L. muscle 
layers (C. circular ; Ob. oblique ; Long. longitudinal) ; c.g.c. cocoon-gland cells ; ¢.g.c.d. 
cocoon-gland cell ducts. 
(Issued separately, 12th March 1917.) 
