137 
Genera of Semiparasitic Polyzoa. 
1. Loxosoma singulare, Keferstein. 
Lo.vosoma singulare, Keferstein, Zeitschriftf. wiss. Zool. xii. 1802, p. 13; 
Claparede, Beob. iiber Anat. und Entw. wirbelloser Thiere an der 
Kiiste yon Normandie, 1863, p. 135, pi. ii. figs. 6-10; Barrois, Mein, 
sur l’Embryologie des Bryozoaires, 1877, p. 10, pi. xvi. figs. 7-14. 
2. Loxosoma neapolitanum, Kowalewsky. 
Loxosoma neapolitanum, Kowalewsky, Mem. de l’Acaddmie Imp. des 
Sci. de St. Petersbourg, ser. 7, vol. x. 1866, (separate copy) p. 3, 
plate. 
3. Loxosoma Keferstein ii, Claparede. 
Loxosoma Kefersteinii, Claparede, Aunal. d. Scien. Natur. sdr. o, vol. 
vii. 1867, p. 28, pi. vi., translated Ann. & Mag. Nat. Hist. 1868, 
vol. i. p. 311; Claparede, Zeitschr. f. wiss. Zool. xxi. 1870, p. 34, pi. x. 
fig. 4; Nitsclie, Zeitschr. f. wiss. Zool. xxv. 1875, p. 451; Nitsche,Beitr. 
zur Ivenntniss der Bryozoen, iii. Heft, 1876. p. 139, pi. xxv. figs. 
4-20, pi. xxvi. figs. 7-13. 
4. Loxosoma cochlear, Schmidt. 
Loxosoma cochlear, Schmidt, Archiv f. mikr. Anat. xii. 1875, fasc. 1 ; 
and Bemerkungen zu den Arbeiten fiber Loxosoma, 1878, (separate 
copy) p. 68. 
5. Loxosoma alata, Barrois. 
Loxosoma singulare, Schmidt, Archiv f. mikr. Anat. xii. 1875, fasc. 1 
(nec Keferstein), =Loxosoma alata, Barrois, Mem. snr l’embryologie 
des Bryozoaires, 1877, p. 7’,= Loxosoma pes, Schmidt, Bemerkungen 
zu den Arbeiten fiber Loxosoma, 1878, Zeitschr. f. wiss. Zool. xxxi. 
p. 69. 
6. Loxosoma raia, Schmidt. 
Loxosoma raia, Schmidt, Archiv f. mikr. Anat. xii. 1875, fasc. 1, and 
Bemerk. z. d. Arbeiten fiber Loxosoma, 1878, /. c. p. 71. Barrois con- 
* siders this synonymous with L. neapolitanum. 
7. Ljoxosoma tethyce, Salensky. 
Loxosoma tethyce, Salensky, Annales des Sci. Nat. vol. v. 1877, p. 36; 
Schmidt, Bemerk. z. d. Arbeiten fiber Loxosoma, 1878, l. c. p. 71. 
8. Loxosoma crassicauda, Salensky . 
Loxosoma crassicatala, Salensky, Annal. des Sci. Nat. sdr. 6, vol. v. 
P-71. 
9. Loxosoma phascolosomatum, Vogt. 
Loxosoma phascolosomatum, Vogt, as above. 
What is perhaps another genus of the same family has been 
described by Van Beneden and Hesse (‘ Rechcrches sur les 
Bdellodes on Hirudin^es et les Trdmatodes marins,’ 1863, 
p. 82, pi. viii. figs. 12-20), under the name Gyclatella anne- 
