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Series 4, Volume 64, No. 6 
arched and bifurcate with an inner denticulate lobe and an outer acutely pointed secondary cusp 
(Figs. 2E, 3C). The inner denticulate lobe has about 8-21 denticles along its inner margin. The next 
several inner lateral teeth are similar in shape to the innermost tooth (Figs. 2D, 3B), but lack den¬ 
ticles on the inner margin. At about tooth number 7 or 8, the bifid cusps become more elongate with 
the inner cusp longer than the outer one (Fig. 2F). At about tooth 25, the primary cusp is about ten 
times longer than the secondary cusp (Figs. 2G, 3D). The next 67 or so teeth are narrow (Fig. 2H) 
and elongate with a bifid cusp near the apex of the narrow apices (Fig. 3 A). 
Reproductive System (Fig. 4A): Reproductive organs of the holotype fully mature. Ampulla 
thin, tubular, and strongly curved, narrowing somewhat before bifurcating into oviduct and vas def¬ 
erens. Short oviduct entering female gland mass near albumen gland. Prostatic portion of vas def¬ 
erens wide, curved and thin, partially enveloping bursa copulatrix. Prostatic portion narrowing 
abruptly as it transitions into muscular, ejaculatory portion. Ejaculatory portion long curved, nar¬ 
row, entering short, narrow, slightly wider, penial bulb. Penial bulb adjacent to straight, narrow 
vaginal duct at common gonopore. Female gland mass consisting of large mucous gland and small 
membrane and albumen glands. Small, lobate vestibular gland situated near exit of mucous gland. 
Moderately long vagina leading to large spherical, thin-walled bursa copulatrix. Adjacent to vagi- 
Figure 3. Scanning electron micrographs of Rostanga ghiselini sp. nov. A. Holotype, CASIZ 220373, detail of outer 
lateral teeth. B—D. Specimen from Punta Gringa, Bahia de los Angeles, 14 March 1992. B. Inner and middle lateral teeth. 
C. First and second lateral teeth. D. Elongate middle to outer lateral teeth. 
