48 Verm. 
xv. VERMES. 
Rattulus collaris , n. sp., ponds at Sandhurst ; Rousselet, J. Quekett 
Club, vi, p. 266. R. palpitatus , n. sp., shallow pool near Trenton, 
New Jersey, Stokes, Ann. Nat. Hist, xviii, p. 25, = ? ( Gcdopus 
brachiurus , Gosse), which then might be referred to it; Rousselet (2). 
JR. (?) bicornis , n. sp., Charkow, Skorikow, Trudui Kharkov. 
Univ. xxx. 
Rhinops vitrea , Rouss., discovery of , Esher ; Rousselet, J. R. Micr. 
Soc. 181)7, p. 5. 
i Salpina ( similis , n. sp.), shallow pool near Trenton, New Jersey, 
Stokes, Ann. Nat. Hist, xviii, p. 24, = S. macracantha , Gosse ; 
Rousselet (2). 
Stephanoceros eichhorni , male described and figured ; Dixon-Nuttall. 
Taphrocampa clavigera , n. sp., shallow pool near Trenton, New Jersey, 
Stokes, Ann. Nat. Hist, xviii, p. 18. T. selenura , Gosse, antennae 
and frontal cilia; Stokes (2) p. 148. 
Triarthra thranites , n. sp., Charkow, Skorikow, Trudui Kharkov. 
Univ. xxx. 
Trochosphcera solstitialis, in Illinois River ; Kofoid. 
MESOZOA. 
TITLES. 
1. Gamble, F. W. Mesozoa. Cambr. Nat. Hist, ii, ch. iv, pp. 92-96, 
6 figg. 
2. Monticelli, F. S. Adelotacta zoologica. Mt. Stat. Neapel, xii, 
pp. 432-462, pis. xix & xx. 
3. Saint-Josepii, de. Rhopalura pterocirri, n. sp. Orthonectid^ para- 
site d’une annelide. Bull. Soc. zool. France, xxi, pp. 56-59, 3 figg. 
BIOLOGY. 
Monticelli (2) describes cysts embedded in the jelly and in the 
tentacles of Rhizostoma , each containing several individuals of a new 
form of Mesozoa , to which he gives the name Pemmatocliscus. Each 
individual consists of two epithelial layers of cells, with a cavity between 
them. The outer layer is ciliated ; the inner surrounds a cavity, into 
which a mouth opens. There are no organs, and reproduction is by 
fission. The author shows that the organism has nothing to do with 
Gastrodes parasiticus. He also gives a good description and figures of 
Treptoplux rep tans , Korotneff, and compares it with Trichoplax ad/ueraus. 
Saint-Josepii (3) describes a new species of Orthonectid, consisting 
of 6 segments, of which 4 (2nd to 5th) are separated from one another 
by deep ciliated grooves ; the other 2 segments bear tufts of cilia. 
