HISTORY OF THE SUBJECT. 15 



In his third volume, published in 1828, he describes several other Nemerteans. Amongst 

 these in all probability falls also his Planaria sipliuncuhs. I have not been able to identify his 

 Folia punctata ; the size and colour of the proboscis, and the thin edges of the body in his 

 figure, 1 would lead me to place it near Micrura fusca. His Folia oculata is allied to Lineus 

 sanguineus, but the occurrence of eight large eyes on each side, and the somewhat wide and flat- 

 tened nature of the snout in his enlarged figure, 2 make it doubtful. The identification of 

 Folia ccerulescens is also difficult ; but his Folia geniculata is the Cerehratulus geniculatus of M. 

 de Quatrefages. 



In 1829 the same author figures three species in his fourth volume, viz., Opkgocepkalus 

 murenoides? Tuhulanus polymorphus? and Cerehratulus hilineatus? but I cannot find reference 

 thereto in his text farther than the simple explanation of the plate. 0. murenoides may be a 

 variety of Lineus marinus, or else a species with which I am unacquainted. Tuhulanus 

 jiolgmorp/ius has a broad hastate head with lateral fissures. There are no stripes on the brownish 

 ground-colour. In his description of the figure (9) of C. hilineatus he terms the everted pro- 

 boscis " sifone genitale." In a section of the proboscis of this species, he shows at least external 

 circular and median longitudinal fibres, although in some other respects he is obscure, since he 

 speaks of an accessory cavity — probably from the invagination of the proboscis. A representation 6 

 and accompanying explanation are also given of the ovaries of Folia sipJiunculus, in which the 

 author shows a general acquaintance with their position. 



An abstract of Delle Chiaje's observations was given in 1832 in Oken^s 'Isis.' 7 



E. S. Leuckart 8 in. 1828 established the genus Meckelia for the reception of a species 

 [Mechelia somatotomus) which he found in a runlet connected with the Mediterranean. This 

 species was evidently a true example of the Anopla, from the description given of its cephalic 

 fissures and mouth, and therefore it is wrong to apply the generic title to a family so diverse 

 as that containing the Gordius annidatus of Montagu. 



In the same year Dr. George Johnston commenced a series of papers 9 on this department of 

 British Zoology, and he proved a most able and persevering expounder of the habits and general 

 structure of the group, rescuing them from the almost total obscurity in which they were shrouded 

 in this country, and giving a fresh impetus to their investigation. Errors, doubtless, he made, 

 but they were not more striking than those of many of his contemporaries, and not a few of his 

 successors. He described on this occasion three species, viz. Flanaria flaccida, F. unicolor, and 

 F. lactiflorea. The first refers to Nemertes Neesii. The second may be Lineus sanguineus, 

 though he himself does not seem to have been quite sure as to what it was, since no notice is 

 taken of it in his subsequent writings. The last is Jmp/iiporuslactifloreus. The first came from 

 deep water, the last from the littoral region. 



M. Ant. Duges established the genus Frostoma, also in 1828, to designate what appears to 



1 Op. cit., vol. iii, p. 172, tav. 43, f. 11. 2 Op. cit., tav. 44, fig. 1. 



3 Op. cit., vol. iv, tav. 62, figs. 6, 7, and 13—15. 



4 Op. cit., tav. 62, figs. 8 and 12. 



5 Op. cit., tav. 62, figs. 9 and 16. 



6 Op. cit., vol. iv, p. 37, and tav. 53, fig. 7. 



7 Isis, 1832, heft. 6, p. 647, taf. 10, figs. 3—5, and ll 1 — ll 5 . 



' Breves animalium quorundam maxima ex parte marinorum descriptiones, F. S. Leuckart/ 

 HeidelbergEe, 1828. 



9 ' Zoological Journal/ vol. iii, pp. 428 and 429. 



