44 
Fam. Botryllidae. 
Botryllus Gaertn. (s. lat.). 
Botvyllus sp. 
Textfig. 5. 
Locality: Masked Isl., Carnley Harbour, on rocky shore. 
Of this form one colony was collected. The dimensions are: 
length 6 cm, breadth 2,5 cm, the thickness is at least 5 mm. 
The colony, which has grown on shell frag¬ 
ments, is formed of flattened fleshy lobes, se¬ 
parated by deep incisions. The test is trans- 
lucid and a little greyish, but the Ascidiozooids 
are dark (purpie or reddish), which lends a 
violaceous hue to the colony. 
Branching vessels are numerous in the test, 
their terminal bulbs are dark and especially 
closely placed in the periphery of the lobes. 
The ascidiozooids are arranged vertically 
in rows or without any distinet order. C om¬ 
mon cloacal apertures are very inconspicuous. 
The ascidiozooids are 3—3,5 mm long, 
their diameter being ca. 1 mm. 
The branchial aperture is circular, with¬ 
out lobes. 
The atrial aperture is large, only slightly 
prominent; its largest diameter is transversal. 
Fig. 5. Botryllus sp. The upper lip is not prolonged in the roof- 
Ascidiozooid. ^ P . 
like manner and does not form an anal tongue. 
The man tle is delicate and pellucid, pigment more developed 
in some Ascidiozooids than in others. 
Sixteen tentacles are present. Three sizes are represented 
in the order 1, 3, 2, 3, 1, — —. The tentacles of 3rd order are 
very short and not always recognizable. 
The dorsal lamina is a narrow membrane. 
The branchial sac is long with three internal longitudinal 
vessels on each side. Ca. 16 transversal rows of stigmata are pre¬ 
sent. Between the dorsal lamina and the first internal longitudinal 
vessel there are ca. 6 stigmata in a row. Between the vessels ca. 
