NoTT. — On N.Z. Comjyosite Ascidians. 333 



Plate XXVII. 

 Leptoclimi,m maciilatnm. 



Fig. 1. Complete view of single zooid, illustrating the peculiar elongated 



form of body and arrangement of internal organs. Zeiss 



A, camera. 

 Fig. 2. Portion of a section of the test, showing unusual form of cloacal 



canals, spicules, and vacuoles. Enlarged about 2G diameters. 

 .3. Spicules in a group. Z. E, camera. 



Branchial aperture showing arrangement of sijicules around it. 



Z. C, camera. 

 Detail of test highly magnified, with bladder-cells, &c. Z. E, 



camera. 

 Young zooid with branchial stigmata, dorsal languets, &c. Z. 



A, camera. 

 Transverse section through pharj'nx, viewed from below. Z. 



C, camera. 

 View of branchial siphon from the side, with tentacles, nervous 



system, &c. Illustrating the peculiar dilatation (buccal mass). 



Z. C, camera. 



Plate XXVIII. 

 Polysyvcraton paradoxum. 



Fig. 1. Complete view of zooid, showing supposed vascular appendage, 



with internal organs in situ. Zeiss A, camera. 

 Fig. 2. Small portion of section, showing close arrangement of zooids, 



with cloacal canals, &c. Enlarged about 20 diameters. 

 Fig. 3. Group of spicules. Z. E, camera. 

 Fig. 4. Detail of structure in upper layer of the test, showing numerous 



bladder-cells. Z. C, camera. 

 Fig. 5. View of supposed ovary. Z. C, camera. 

 Fig. 6. Detail of branchial basket, showing the transverse lamina. Z. 



E, camera. 

 Fig. 7. Enlarged view of testis, showing numerous vesicles and spiral 



vas deferens with distal enlargement. Altered from a side 



view to scale of Z. C, camera. 

 Fig. 8. Transverse section through pharynx, viewed from beneath, with 



tentacles, nerve system, and endostyle. Z. C, camera. 



Plate XXIX. 

 Polysyncraton fascum. 



Fig. 1. Complete view of zooid with long filamentous vascular ap- 

 pendage, showing reproductive bodies, &c., in situ. Zeiss A, 

 camera. 



Fig. 2. Portion of section showing position of zooid with short bulbous 

 vascular appendage, also large cloacal ojpening and canals. 

 Enlarged about 20 diameters. 



Fig. 3. Large ovum. Z. C, camera. 



Fig. 4. Group of calcareous spicules, showing extreme variability in 

 size. Z. E, camera. 



Fig. fK Supposed ovary. Z. C, camera. 



Fig. 6. Branchial siphon in side view, with tentacles, and longitudinal 

 buccal muscles running up to the buccal lobes. Z. C, camera. 



Fig. 7. Detail of upper test-layer, showing the transparent matrix above, 

 and test-cells and bladder-cells below. Z. E, camera. 



Fig. 8. Separate view of alimentary canal : the stomach cut through 

 longitudinally. Slightly enlarged from an outline taken with 

 Z. A, camera. 



