bio liverpool marine biology committee report. 



Explanation of the Plates. 



Plate V. 

 Polycarpa monensiSf n, sp. 



Fig. 1. Specimen of Polycarpa monensis, from side, natural 

 size. 



Fig. 2. Ectoderm cells seen in profile, magnified 300 

 diameters. 



Fig. 3. Ectoderm cells, surface view, magnified 300 diame- 

 ters. 



Fig. 4. Part of mantle, magnified 50 diameters. 



Fig. 5. Tentacles, magnified 50 diameters. 



Fig. 6. Alimentary canal, natural size. 



Fig. 7. Part of branchial sac, magnified 50 diameters. 



Fig. 8. Small portion of branchial sac, magnified 300 

 diameters. 



Plate VI. 



• Figs. 1-4. Morchellioides alderi, n. sp. 



Fig. 5. Ascidia plebeia. Alder. 



Fig. 6. Molgula occulta, Kupfier. 



Fig. 7. Botryllus smaragdus, M.-Edw. 



Fig. 1. Several small colonies of Morchellioides alder I, 



natural size. 

 Fig. 2. Single larger colony of Morchellioides alderi, 



natural size. 

 Fig. 3. An ascidiozooid of Morchellioides alderi, seen from 



right side, magnified 50 diameters. 

 Fig. 4. Small part of the branchial sac of Morchellioides 



alderiy magnified 50 diameters. 

 Fig. 6. The dorsal tubercle and anterior part of the dorsal 



lamina of Ascidia plebeia, magnified 50 diameters. 

 Fig. 6. The dorsal tubercle of Molgula occulta, an abnormal 



specimen, magnified 50 diameters. 



