. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. HEMPHILLIA. 247 Fig. H. glandulosa, contracted in spirits. Fig. 146. Jaw of H. glandulosa. slightly reflected over the edges of the shell. No distinct locomotive disk to foot. Lines of furrows run near and parallel to edge of foot, rising above the extremity and apparently uniting over a transverse mucus slit, overhanging which is a greatly produced horn- shaped process. Respiratory orifice at right edge of mantle, near its centre. Generative orifice at right side of neck, near right eye-peduncle. Shell external
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. HEMPHILLIA. 247 Fig. H. glandulosa, contracted in spirits. Fig. 146. Jaw of H. glandulosa. slightly reflected over the edges of the shell. No distinct locomotive disk to foot. Lines of furrows run near and parallel to edge of foot, rising above the extremity and apparently uniting over a transverse mucus slit, overhanging which is a greatly produced horn- shaped process. Respiratory orifice at right edge of mantle, near its centre. Generative orifice at right side of neck, near right eye-peduncle. Shell external, not spiral, its edges imbedded lightly in the mantle, very thin, unguiform, almost as large as the mantle (in specimens preserved in alcohol). Jaw wide, low, slightly arcuate; ends blunt, but little attenuated; anterior surface with numerous ribs denticulating either margin (Fig. 146). Lingual membrane described below under H. glandulosa. Oregon Region, at Astoria. This curious slug, by its general outline and by the form and position of^its shell, may be compared to Omalonyx unguis H. glan- D'Orb, an(l the species known formerly as Succinea appendiculata Pfr., but now usually referred to Amphibulima. The former has, however, a jaw with the supplementary extension as in Suc- cinea, the latter has the jaw usual in Bulimulus and Cylindrella, while neither of them has the prolongation of the mantle. Both of those genera'also are readily distinguished by their shell being more developed and approaching a spiral form. Hyalimax is distinguished from Hemphillia by its Succinea-like jaw. Other- wise, it resembles our genus in its general outward appearance, and by its non- spiral shell. This shell, however, in Hyalimax is almost, if not completely, internal, while the shell of Hemphillia is entirely exposed. Binneya, in its prolonged mantle and costate jaw, resembles Hemphillia, but its shell is much more developed, spiral, striate and almost capable of protect- ing, though not absol
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