NEW SPECIES OF PERtCHJETA. ' 225 



Fig. 1 c. Spermatheca. sp. Spermatozoa iu diverticulum, x. Coagulated mass 



in main sac. 

 Fig. 1 d. Cfficum : side view of the intestine (i) in segment 27, showing origin 



and lobulation of the caecum (c). &-. Septum. 

 Fig. 2. PerichcEta Sedgwickii, n. sp. 

 Fig. 2 a. View of male pores, po. Porophore surrounded by grooves : the 



actual pore of sperm-duct is very small. 

 Fig. 25. Ventral view of the clitellum. X 3. The body-wall has been slit 



up and spread out; the "limited" nature of the organ is shown, as 



well as the existence of complete rings of chsetse iu each of its 



constituent segments. 

 Fig. 2 c. Spermatheca. X 6. div. Small, sessile diverticulum. 

 Fig. 2 d. Spermiducal gland. X 4. d. Penial duct. 

 Fig. 2e. Normal chseta from segment xii. X 110. 

 Fig. 2/. Large chseta from seventh segment. X 110. 

 Fig. 3. FerichcBta Floweri, n. sp. 

 Fig. 3 a. Spermiducal gland. 

 Fig. 3 b. Spermatheca. 



Plate 16. 



Fig. 4. Perickcsta Arturi, n. sp. 



Fig. 4 a. View of the 18th segment, showing the male pores, with the penis {p) 

 portruded from one pore. po. Porophore. X 6. 



Fig. 4 b. The pair of spermiducal glands of one specimen in which the penis 

 is at rest. X 4. On the right side is shown the normal shape of the 

 gland : that on the left is abnormal. 



Fig. 4 c. The spermiducal gland ( X 6) of a specimen in which the penis is 

 protruded, b. Glandulo-muscular sac. c. Its externally directed 

 finger-shaped prolongation, or " penial sac." d. The U-shaped penial 

 duct (cf. a in text-figs. 1, 2) penetrating the wall of this prolon- 

 gation, gl. The gland. 



Fig. Ad. A spermatheca. X 4. div. Diverticulum. 



Fig. 4 e. The gizzard and vascular system of its neighbourhood. A thin 

 but complete septum between segments viii./ix. is inserted close 

 to the hinder border of the gizzard, a, b, c. Commissural vessels. 

 d. Dorsal vessel. 



Fig. .5. Perichmta Madelince, n. sp. 



Fig. 5 a. The spermiducal gland. X 4. gl. Gland, d. Penial duct. b. Mus- 

 cular bulb (or sac). 



Fig. 5 b. Spermatheca. 



Fig. 5 c. The sperm-sacs — to show the peculiar filamentous prolongation (/). 

 s'. The second sperm-sac. sep. Septa, r, r^. Ciliated rosettes in 

 the " capsules " (Samenblasen). 



Fig. 6. Perichsia malamanie7isis. 



Fig. 6 a. Spermiducal gland, a. Sperm-duct. b. Glandulo-muscular sac or 

 " atrium." d. Penial duct. gl. The gland. 



Fig. 6 b. Spermatheca. 



