TU1U3KLLARIA. 
501 
organs of Nemerteans, based upon the examination of 13 species, with 
few exceptions observed at Naples. 3 species are new, belonging to 
Drepanophorus g. n. (rubrostriatus, serraticollis, and nisidensis, spp. nn.), 
distinguished by the possession, instead of the stylet, of a sickle-shaped 
hook ; eyes about 60, in four series, body depressed, &c. Cerebratulus 
spectahilis, Quatref., of which the aberrant armature has been the cause 
of some doubt, probably belongs to this genus. 
Mesostomum hifidum^ sp. n., Maclatosh, Ann. N. H. (4) xiv. p. 151 (St. 
Andrews). 
Tetrasiemma vittatal^-tuni], sp. n., Verrill, Am. J. Sci. (3) vii. p. 45, 
pi. vii. fig. 3 ; P. Am. Ass. 1873, p. 389, pi. ii. figs. 7 & 8 (Casco Bay). 
T. agricola, Willemoes-Suhm (6), pi. xvii. figs. 1-3, Bermuda : anatomy 
sketched ; there is a difference of shape of the stylet according to sex. 
The young of a Tetrastemma were found parasitical on Naiitilograpsus 
minutus (1. c. p. 411, pi. xvii. fig. 4). 
Macronemertes gigantea, sp. n., Verrill, Am. J. Sci. (3) vii. pi. vii. fig. 2; 
P. Am. Ass, 1. c. p. 389, pi. ii. figs. 5 & 6. Ophionemcrtes (g. n.) agilis, 
sp. n., id. Am. J. Sci. 1. c. p. 45, pi. vii. fig. 1 ; P. Am. Ass. 1. c. p. 389, 
pi. ii. fig. 4. Allied to Tetrastemma ; eyes numerous, forming a long 
crowded lateral row or group along each side of the head, converging 
anteriorly, becoming broad and double posteriorly. 
Graff (2) has studied the anatomy of the following Rhabdocoelian 
species : — Turhella Iclostermanni^ sp. n., p. 143, pi. xiv. figs. 1-4, and Mono- 
celis prbtractilis, sp. n., p. 145, pi. xiv. figs. 5-9 (Messina) ; Mesostomum 
ehrenbergi, O.S., p. 146, pis. xv. & xvi. ; Convoluta armata, sp. n., p. 149, 
pi. xvii. figs. 1-5, and cinerea, p. 151, pi. xvii. figs. 6^7, and Vorticeros 
pulchellum, O.S., p. 151, pi. xviii. (Messina) ; Prostomum nemertinum 
sp. n., p. 153, pi. xix. [The general portion of this paper was published 
as a dissertation, without figures, in 1873 ; cf. Zool. Rec. x. pp. 480 & 481]. 
Nemertes maculosa and teres, spp. nn., Ehlers (in Heuglin’s Reisen,” 
1. c.) pp. 248 & 249 ; Borlasia incompta, sp. n., id. 1. c. p. 249 (Spitsbergen). 
Turbellaria from the great depths of the Lake of Geneva : Planaria 
lacustris, sp. n., Mesostomum auditivum, sp. n. (with otocysts !), and 
Vortex lemani, sp. n., Du Plessis, Bull. Soc. Vaud. xiii. pp. 48, 49, 114- 
124, pi. Hi. figs. 1-3. 
Dikck (1) has studied the anatomy and evolution of Cephalothrix (?) 
galathece (sp. n. P), which lives on Galatliea strigosa, devouring its eggs ; 
afterwards it takes its abode in the branchial cavity, and perhaps sucks 
the blood of the gills. The eggs and spermatozoa are evacuated through 
defined ventral orifices provided with a sort of lid, and the spermatozoa 
penetrate through these openings to the eggs, which are thus fecundated 
and partially furrowed while still in the body of the mother. The author 
compares the method of evolution of this species with that observed in 
other Nemerteans, and regards the rejection of the first formed vibratilo 
epithelium, in the embryo, as the last vestige of the Pilidium" meta- 
genesis (or rather metamorphosis) in other species. 
A note on the occurrence of Planaria terrestris in the neighbourhood 
of Bath, by L. Blomefield, P. Bath Club. Hi. 1. Also a note on Geo- 
desmus hilineatus, by Grube, JB. schlcs. Ges. 1873, p. 56. 
