PLATE XLI. 
Figs. 1-4. Leptoclinum carpenteri, n. sp. 
Figs. 1 , Leptoclinum thomsoni, n. sp. 
Branchial aperture. 
en. Endostyle. 
l.v. Fine longitudinal vessels of bran- 
chial sac. 
m. b. Muscle band in mantle. 
01. (Esophagus. 
r. Kectum. 
sg. stigmata of branchial sac. 
sp. Calcareous spicule in test. 
st. Stomach. 
t.c. Test cells. 
t. 7 H. Test matrix. 
tr. Transverse vessel of branchial sac. 
t.v. Spermatic vesicles. 
V. Vessel in the test. 
Fig. 1 . Colonies of — A. Leptoclinum thomsoni, and B. Leptoclinum carpenteri; 
natural size. 
Fig. 2 . Part of a vertical section through the colony of Leptoclinum carpenteri, showing 
arrangement of spicules and structure of Ascidiozooids ; magnified (S., 1 inch). 
Fig. 3. Section through test of Leptoclinum carpenteri; highly magnified (S., 5 inch). 
Fig. 4. Part of branchial sac of Leptoclinum carpenteri; highly magnified (S., ^ inch). 
Fig. 5. Part of a vertical section through the colony of Leptoclinum thomsoni, showing 
arrangement of spicules and structure of Ascidiozooids ; magnified (S., 1 inch). 
Fig. 6 . Spicules from test of Leptoclinum thomsoni; highly magnified (S., \ inch). 
Fig. 7. Part of a vertical section through upper part of colony of Leptoclinum thomsoni, 
showing the thoracic region of an Ascidiozooid and the neighbouring test ; 
highly magnified (S., \ inch). 
