230 F. W. GAMBLE, B.SC. 



Habitat. — One specimen in a tide-pool, Plymouth (F. W. G.). 

 Distribution. — Jacobshavn, West Greenland (Levinsen). 



Genus 24 — Automolos, v. Graff (53). 

 Monotidcein which the female pore lies behind the male. 



55. Automolos unipunctatds (Oersted, 16). 



1826. Planaria unipunctata, Fdbricius (9). 



1844. Monocelis unipunctata, Oersted (16). 



1851. „ „ Schultze (27). 



1861. „ sp. (? unipunctata, Oe.), Claparede (35). 



1875. „ unipunctata, Mcintosh (45). 



1878. „ spinosa, Jensen (49). 



Length 1 — 1*5 mm. Body resembling Monotus fuscus in form, the 

 hinder end, however, not expanded into an adhesive disc. Usually 

 colourless. Ocular pigment is absent. Otolith with a pair of simple 

 accessory concretions. The mouth, pharynx, and intestine resemble 

 those of the preceding species. My specimens, as might be concluded 

 from their small size (Jensen's were 3 mm., Schultze's measured as 

 much as 6 - 6 mm.), were immature, and in consequence the genital 

 ducts were not fully developed. According to the naturalists just 

 named, the penis lies behind the male genital pore. It consists of a 

 vesicula seminalis which conveys both spermatozoa and accessory 

 secretions into the coiled ductus ejaculatorius, the terminal portion of 

 which when extended is finger-like, and provided with small spines of 

 variable shapes on its exterior. (See Schultze [27], pi. ii, and Jensen 

 [49], pi. vi, fig. 9.) The two oviducts unite in the anterior region of 

 the body, and the common duct runs back to the female genital pore, 

 which also receives the duct of a vesicle — apparently spermotheca and 

 uterus combined, since Jensen found sperm and ova in it. 



Habitat. — Skye (Claparede) ; St. Andrews, under stones between 

 tide-marks (Mcintosh); among littoral algse, Plymouth (F. W. G.). 



Distribution. — Bergen (Jensen), coast of Denmark (Fabricius, 

 Oersted), Greifswald (Schultze), Madeira (Langerhans), Black Sea 

 (Uljanin Czerniavsky). 



