174 PKOSORHOCHMUS CLAPAEEDIL 



the type of the Enopla. The large size of 0. maculata (3 to 3| in.) from the shores of Sicily is 

 peculiar. Sir J. Dalyell says it is rare, and that its colour is universally variegated red and white, 

 with a white line down the back, but his drawing shows only interrupted specks along the dorsum. 

 This excellent author held the opinion, which I cannot endorse, that the Planaria dorsalis of 

 Abildgaard referred to a fragment of Lineus bilineatus. The Tetrastemma marmoratum of M. 

 Claparede, from the coast of Normandy, is the present species. The cylindrical form of the body 

 had previously been known. 



Genus III. — Prosorhochmus, 1 Keferstein, 1863. 



The typical species of this genus was first mentioned by Col. Montagu (MS., Library of the 

 Linnean Society), who, however, was inclined to refer it to the Planaria Candida of O. F. Muller. 

 It is unlikely that so common a species escaped the notice of observers from the foregoing period 

 up to 1863, the date at which Professor Keferstein published his descriptive characters of the 

 genus in his ' Untersuchungen/ but it is probable that it was confounded with other forms. The 

 four eyes which are characteristic of the previous genus are retained, only they do not form a 

 rectangle. I would not place much weight (generically) on the ovo-viviparous character, as this 

 is a condition which further investigation will probably extend to many genera. 



Generic character, — Eyes four, not forming a rectangle ; snout dimpled and furnished with 

 a transverse superior lobe. Ovo-viviparous. 



Prosorhochmus Claparedii, Keferstein. Plate II, fig. 4. 



Specific character. — Snout blunt ; eyes placed far back, the space between the anterior pair 

 widest ; yellowish. Other characters as in the genus. 



Synonyms. 



1808. Planaria flava, Montagu. MS., p. 237, tab. 35, f. 2. 



1846. Poliafumosa, De Quatrefages. Annal. des sc. nat., 3 me ser., Zool., vi, pp. 206-7. ? 



1849. „ „ Ibid. Voyage en Sicilie, vol. ii, p. 118, pi. 14, f. 9—11. ? 



1862. Prosorhochmus Claparedii, Keferstein. Zeitsch. f. wiss. Zool., Bd. xii, p. 61, taf. 6, f. 1 — 5, 



1863. „ „ Diesing. Nachtrage zur Revis. der Turbell., p. 10. 



„ ,, „ Claparede, Beobach. uber Anat. u. Entwick., p. 23, taf. 5, f. 10 — 12. 



1869. „ „ Mcintosh. Trans. Roy. Soc. Edinb., vol. xxv, pt. ii, p. 344 et seq. 



Habitat. — Under stones, and in fissures of rocks between tide-marks, on the southern shores 

 of England, and in the Channel Islands. 



Body an inch to an inch and a half in length, and three quarters of a line in breadth, flat- 

 tened, somewhat narrowed behind the head, then gradually dilating, continuing for some distance 

 of nearly equal diameter, and again diminishing towards the tail. In those examples in which 

 the ovisacs are filled with developing young the body is round. The anus is very distinct. 



1 7rpoo-w, the front, and pwxi^og, a fissure. 



