Cyathocormus mirabilis n. g, , n. sp. 3 



no use to consider the diagnostic characters of the family and the 

 genus separately. They are naturally the same and may be 

 summed up as follows : 



Cyathocormus nov. gen. 



Colony fixed, stalked; the head having the form of a 

 short hollow cylinder closed at one end and open at the 

 other. 



Systems — only one present, the terminal aperture being the 

 common cloacal opening, and the central cavity the 

 common cloaca. 



Zooids placed in a single layer with their anterior ends 

 external and their posterior ends internal. Body 

 divided into two regions, thorax and abdomen, the latter 

 provided with a long vascular appendage. Branchial 

 apertures opening on tlie outer surface of the colony, not 

 lobed. Peribranchial wall imperfectly developed, stig- 

 mata of the branchial sac as well as the anal and 

 genital apertures opening directly into the centrally 

 placed common cloaca. 



Test soft, gelatinous, and transparent; no calcareous spicules, 

 bladder cells very numerous. 



Branchial sac large and well developed, with four rows of 

 stigmata ; no internal longitudinal vessels present. 

 Stigmata very long and narrow. 



Tentacles simple. 



Dorsal lamina represented by a series of languets. 



Alimentary canal forming a simple loop placed posteriorly to 

 the branchial sac. Stomach ellipsoidal and smooth 

 walled, no coecum. Duodenal portion of intestine dis- 

 tinctly bounded, fine tubular intestinal gland Avell 

 developed. 



Reproductive organs not conspicuous. Incubatory pouch pre- 

 sent. Larva tailed. 



