10 Ferm. 
VERMES. 
Dendroccelum lacteum^ Vortex lemani^ and a species of Ligiila are 
recorded from the depths of the Lake of Geneva; Bull. Soc. Yaud. xiv. 
pp. 203 & 204. 
Plagiotcenia gigantea, Peters, in the rhinoceros of the Sunderbunds, 
the third species of rhinoceros in which this form has been found; 
Garrod, P. Z. S. 1877, pp. 788 & 789. 
Barrois (5), p. 30, points out that the species Lineus sanguineus and L. 
gesserensis are allied by a number of intermediate forms, and adopts, for 
the two, Desor’s name ohscurus (the young of the first year are said to be 
not so strongly pigmented). As McIntosh has united in his Amphiporus 
spectahilis the two forms Cerelratulus spectahilis, Quat., and Borlasia 
splendida, Keferst., which have nothing in common save their coloration 
(alternating white and violet bands), and as there is already a Drepano- 
phorus spectahilis, Barrois proposes to return to Kcforstcin’s specific 
name of splendidus for the Amphiporus so common at Roscolf. 
Anatomy, Development, &c. 
Barrois (5), in an elaborate memoir, details the history of Lineus ob~ 
scurus (pp. 30-97, pis. i., iv., vii., ix., & xi. fig. 156), Amphiporus lacti- 
jtofcus (pp. 100-137, pis. V., vi., vii., & x.), A, splendidus (pp. 137-140, 
pi. ix.), and Tetrastemma candidum (pp. 140 & 141, pi. vii.). There is an 
account, also, of the regeneration of the head in Lineus ohscurus, and 
of L'etrastemma dorsale (pp. 154-160, pi. vii.), Polia carcinophila (pp. 
160-165, pi. vii.), and Cephalothrix linearis (pp. 165-167, pi. vii). The 
memoir concludes with some general considerations on the structure and 
evolution of these forms. Of points of most importance — the gastrula 
is formed by invagination ; its orifice (blastopore) becomes completely 
closed up ; the prostomium is indicated very early ; the true ectoderm 
disappears during development ; and the epithelial layer of the adult is 
of mesodermal origin. 
Minot (13) investigates the anatomy of the Dendroceda, and proposes 
the following classification : — Accela : Nadina, Convoluta, Schizoprora. 
Apharyngea : Macrostomum, Vera. Pharyngoccela : Phahdocoda — 
Rhahdocoila (auct. pt.); Dendroceda. Yaginifer^ : Trematoda, Cestoda. 
In (14) he gives a sketch of what is known as to these forms, based on 
the investigations of others, as well as on his own. 
Hoffmann (9) agrees with Semper in regarding Malacohdella as a 
Nemertine, and not a Leech ; its only point of agreement with the Hiru- 
dinca is the possession of a posterior sucker. His specimens were found 
in the gills of Pholascrispata (never in P. Candida), and were found to 
be sexually mature from November to March. 
Steudener (22) describes the structure of the cuticle, water-vascular 
system, and nervous system of the Cestodes ; the generative organs of 
Ticnia elliptica, Batsch, and of Triuinophorus nodulosus, Bud. ; and the 
structure of L'amia tripunctata, Braun. 
Redon’s (21) experiments will, if confirmed, be of value as affording 
an exception to the law that parasites undergoing alternation of genera- 
tion cannot attain their complete development in the same individual or 
