174 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Fig. 39. Microcosmus exasperatua Heller, overgrown with si colony of Stolonicu 

 vesicnlaris. new species. No. 135. (Type of latter species.) Sta- 

 tion D5145. X 0.9. 



40. Styela tinaktae, new species. No. 13(5. Station D5159. Two indi- 



viduals. X 0.9. 



41. Polycitor torosus Sluiter. No. 62. Station D5148. Colony seen from 



one side. Very slightly enlarged. 



42. Ctenyura intermedia, new species, new genus. No. 140. Station D5536. 



Two individuals (cotypes) seen from the dorsal side. Very slightly 

 enlarged. 



43. Polysyncraton dubium Sluiter. No. 4. Station D5139. Very slightly 



enlarged. 



Plate 33. 



Fig. 44. Didemnum ternatanum (Gottschaldt). No. 129. Locality, Mantacao 

 Island. Colony seen from one side. Slightly reduced. 



45. Amaroucium crateriferum Sluiter. No. 145. Station D5174. Slightly 



reduced. 



46. Amaroucium crateriferum Sluiter. No. 45. Locality, Jolo, Jolo Island. 



Slightly reduced. 



47. Holozoa vallii (Herdman). No. 115. Station D5148. Colony seen 



from one side. Slightly reduced. 



48. Holozoa vallii (Herdman). No. 65. Station D5149. Slightly reduced. 



49. Polysyncraton dubium Sluiter. No. 5. Station D5145. Colony grow- 



ing upon and nearly enveloping a small crab. Showing the lower 

 surface of the crab, the upper being entirely covered by the ascidian. 

 Slightly reduced. 



