stylet tip thickening absent
Macrostomum japonicum Fig 26-28.jpg
eyes small, reniform. The penis-stilette is a curved and distally hooked funnel with a terminal opening. p. 204
Macrostomum curvistylum Fig 4-6.jpg
The external opening of the stilette is at an oblique angle. The proximal, basal part of the stilette is crenated. p. 192
Macrostomum collistylum Fig 1-3.jpg
The stylet reaches its termination in a long sharpened point. p. 188 The sperm cells are elongate, undulating bodies which lack the postero-Iateral setae so common to the genus and are possessed of chromatin granules in the anterior part of the cell having the largest caliber. p. 189
Macrostomum nassonovi Fig 6.jpg
This stilette is a completely bent spiralled and sharply pointed tube. p. 277
Macrostomum phillipsi Fig 13-16.jpg
Macrostomum rhabdophorum Fig 26.jpg
Roughly crenated base. The termination is a very peculiar structure, three drawings of which are given better describe it (Fig. 22). Lateral, end, and dorsal views (a), (b), are shown. The sperm cell is a tapering filament which is possessed lateral setae in the posterior third of the cell. It is interesting note that the greatest number of sperm cells in this species is produced in the latter part of June, the warmest part of the summer in the Mountain Lake region. Also of interest is the fact that sperm is liberated in macerations of the animal will make attempts to penetrate the egg of the parent. The 'feeler' is a slowly undulating tactile organ as long as the sperm cell remains in the body of the animal, but it becomes a highly vibratile structure when in maceration. p. 289
Macrostomum orthostylum Fig 11-12.jpg
The singular sperm cells are particularly well described as lengthened fine threads which have an undulating feeler at one end. The major portion of the cell is spindle-shaped and contains a non-spherical nucleus enmeshed in an hyaline cytoplasm. Axial and spirally arranged filaments are present In the cell. p. 280
Macrostomum ruebushi var truncatum Fig 31-34.jpg
The penis-stilette is a funnel with a crenate base which is slightly obliquely truncated. The curved and pointed termination has a small distal lip. The opening is terminal. p. 45
Macrostomum ruebushi var granulophorum Fig 19-23.jpg
This stilette is lined by bands of muscles which presumably aid in ejaculation. The stilette has a bend of almost a right angle at its sharpened termination and opening. p. 36
Macrostomum riedeli Fig 1-7.jpg
The penis -stilette is funnel- shaped with an obliquely truncated base. (Distal?) opening is oval in shape and terminally truncated. p. 291