FIG. 4. — Botrylloides crystallinus n in Botrylloides crystallinus n. sp., a new Botryllinae Adams & Adams, 1858 (Ascidiacea) from Mediterranean Sea

FIG. 4. — Botrylloides crystallinus n. sp.: A, intestinal loop with its folding (arrow's head); B, rectus of the same sample of A on a different focal plane; C, other intestinal loop with the anal cl opening spread outward; D-F, parietal and mesial sides of the stomach. Abbreviations: ao, anal opening; cl, coecum lenght; pat, point of attachment of one trabecula; pc, pyloric caecum; sl, stomach length. Scale bars: A-C, 20 µm; D-F, 400 µm.