490 F. W. GAMBLE. 



Habitat. — One specimen in a tide-pool^ Plymouth (F. 

 W. G.). 



Distribution. — Jacobshavn, West Greenland (Levinsen). 



Genus 24. — Automolos, v. Graff (53). 



Monotidse in which the female pore lies behind the 

 male. 



55. Automolos unipunctatus (Oersted, 16). 



1826. Planaria unipunctata, Fabricius (9). 



1844. MoNOCELis unipunctata, Oersted (16). 



1851. „ „ Schultze (27). 



1861. „ sp. (? unipunctata, Oe.), Clap are de (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 pre- 

 ceding 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 



