236 F. W. GAMBLE, B.SO. 



Length 1*4 mm. Body extremely contractile, so that a definite 

 shape cannot be stated. The ground-colour is pale-yellow ; the main- 

 gut and its branches are brown, ending in marginal black spots. 

 Small white spots (due to the underlying ovaries) are dotted over the 

 dorsal surface. On this surface, nearly one fourth the length of the 

 body from the anterior end, are the cylindrical tentacles, which are 

 during life capable of being suddenly extended and as quickly 

 retracted into pits. Round the bases of these tentacles are 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). 

 Planoceridm with a delicate body expanded anteriorly. 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 atrhem. 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 SUBAURICULATA, Johnston (12). 



1845. Stylochus maculatus, Quatrefages (18). 



? 1853. Planaria corniculata, Daly ell (29). 



1863. Stylochus maculatus, Clapar&de (36). 



? 1865. Leptoplana subauriculata, Johnston (38). 



1866. ,, „ Bay Lankester (39). 



1874. „ „ Mcintosh (45). 



1884. Stylochoplana maculata, Lang (54). 



Length 12 — 16 mm. Body flat, elongate, increasing in width from 

 the hinder end forwards, the anterior fourth expanded 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 commencement of the 

 hinder fourth of the length of the body ; the female pore a short 



