PLATE XXVII. 
Figs. 1 , 2. (?) clava, n. sp. 
Figs. 3-8. A'plidium incrustans, n. sp. 
Figs. 9-12. Amaroucium colelloides, n. sp. 
hi. Bladder cell. 
f.p. Foreign particle in test. 
1 . Languet. 
l. v. Fine longitudinal vessels of bran- 
chial sac. 
m. /. Muscle fibres. 
0. Ovum. 
o. s. Outer surface of test. 
p. 0. Pigment cell in test. 
pig. Mass of pigment cells. 
sg. Stigmata of branchial sac. 
sph. Sphincter. 
t.c. Test cells. 
t.lc. Terminal bulb on vessel in test. 
t.m. Test matrix. 
tn, tn'. Tentacles. 
tr. Transverse vessel of branchial sac. 
t.v. Spermatic vesicles. 
v.ap. Vascular appendage. 
v.d. Vas deferens. 
Fig. 1. Colony of 
(?) clava ; natural size. 
Fig. 2. Section of test of 
(f) clava; magnified (S., 1 inch). 
Fig. 3. Colony of Aplidium incrustans ; natural size. 
Fig. 4. Part of test of Aplidium incrustans, showing imbedded foreign particles ; highly 
magnified (S., ^ inch). 
Fig. 5. Part of branchial sac of Aplidium incrustans; highly magnified (S., ^ inch). 
Fig. 6. Three of the ciliated cells from the stigmata of Aplidium incrustans; more 
highly magnified (Z., j^^). 
Fig. 7. Part of dorsal lamina of Aplidium incrustans, showing two languets ; highly 
magnified (S., inch). 
Fig. 8. Tentacles of Aplidium incrustans; highly magnified (S., ^ inch). 
Fig. 9. QioXonj oi Amarcwcium colelloides ; natural size. 
Fig. 10. Part of branchial sac of Amaroucium colelloides; magnified (S., 1 inch). 
Fig. 11. Reproductive organs of Amaroucium colelloides in post-abdomen; magnified 
(S., 1 inch). 
Fig. 12. Larva of Amaroucium colelloides; highly magnified (S., ^ inch). 
