BRITISH MARINE TURBELLARIA. 497 



clusters of eyes. The two genital apertures lie behind the 

 mouth, the male pore in front of the female. 



Habitat. — The coralline region, Berwick Bay (Johnston). 



Distribution. — Palermo (Grube). 



Genus 28. — Stylochoplana, Stimpson (32a). 



Planoceridse with a delicate body expanded ante- 

 riorly. Marginal eyes absent. Pharynx only 

 slightly folded at rest. 6—7 pairs of secondary 

 gut-branches. Genital apertures separate or 

 united. Penis unarmed. Penial sheath serves as 

 genital atrium. Vesicula seminalis opens into 

 the vesicula granulorum, and this direct into the 

 ductus ejaculatorius. Bursa copulatrix and 

 accessory vesicle present. 



61. Stylochoplana maculata, Quatrefages (18). 



? 1836. Plan aria suBAUKicuLATA, Johnston (12). 



1845. Sttlochus maculatus, Quatrefages (18). 



? 1853. Planaria cokniculata, Dalyell (29). 



1863. Stylochus maculatus, Claparede (36). 



? 1865. Leptoplana subauriculata, Johnston (38). 



1866. „ „ Ray Lankester (39). 



1874. „ „ Mcintosh (45). 



1884. Stylochoplana maculata, Lang (54). 



Length 12 — 16 mm. Body fiat, elongate, increasing in 

 width from the hinder end forwards, the anterior fourth ex- 

 panded laterally. The general colour is warm brown, due to 

 the underlying gut-branches. Along the mid-dorsal surface, 

 pale areas indicate the position of the pharynx and the genital 

 pores. A pair of dorsal tentacles are present. Mouth mid- 

 ventral, leading into the pharynx, the walls of which are 

 plaited. 5—6 eyes are borne by each tentacle, and 7 — 8 occur 

 round their bases. The male genital pore lies at the com- 

 mencement of the hinder fourth of the length of the body ; 



