Figures 4–6 in First record of the family Spengeliidae (Hemichordata: Enteropneusta) from Chinese waters, with description of a new species

Figures 4–6. Glandiceps qingdaoensis, new species, histological characteristics. (4) Longitudinal section through proboscis, collar, and anterior part of branchial-genital region of holotype, showing overall structure of proboscis. Circular musculature of the anterior part thicker than posterior part, dense and sparse longitudinal musculature, cornua of the skeleton extends to the median posterior portion of collar. (5) Transverse section through the anterior proboscis of paratype, showing the complete dorsal-ventral muscle septum. (6) Magnified photograph of centric portion of Figure 5, to show many irregular gland cells.