1887.] »MICROSCOPICAL JOURNAL. 
6. Parasitic on Crustacea; teeth 2 site RIN oe ese 
6. Not parasitic, fusiform, strongly fluted; teeth none 
6. Not parasitic ; closely corrugated ; teeth 2 
17. ADINETA vaga. 
18. Microcopon clavus. 
Ig. ASPLANCHNA. 
Female with 4 humps; eye single 
Female without humps; eye single 
Female without humps; eyes 3 
20. SACCULUS verdes. 
21. SYNCHATA. 
Marine, luminous; cylindric, conical behind 
. Fresh-water ON 
Body length 4 vy inch; auricles long, pointed 
NAAR S 
Body pyriform or ovate; auricles wide, rounded 
22. POLYARTHRA. 
Spines, 12, broad, serrated 
23. PTERassa. 
Pinne 24, in 6 longitudinal rows; horny yellow. 
24. TRIARTHRA. 
Spines more than twice the body length 
Spines less than twice the body length 
Spines less than one-fourth the body length 
25. PEDETES. 
Leaping styles twice the body length 
26. HypDATINA sexta. 
27. RHINOPS vitreda. 
28. Norops. 
Foot 4 total length, not wholly retractile 
Foot 4 total length, wholly retractile 
Foot i total length, wholly retractile ; body partially loricate 
29. ALBERTIA. 
Body tho inch, straight, unconstricted 
; inch, slightly constricted behind 
w 
° 
[oh 
a 
~ | 
a 5 
30. ‘TAPHROCAMPA. 
Cylindric, short, thick, articulate ; brain opaque 
Fusiform, annulate; brain clear aN Pe 
31. PLEUROTROCHA. 
Length 54, to 54, inch 
Length 4, inch 
se) 
Length =}; inch 
32. NOTOMMATA. 
§ Brain more or less opaque (2). 
§ Brain clear (6). 
a. Body subcylindric, ventricose ; auricles large, evertile 
a. Body subcylindrical, auricles small, evertile 
a. Body subcylindrical, auricles not visible ; 
Body length ;1, inch; auricles scarcely protuberant 
107 
parasitica. 
elegans. 
. bidens. 
Etbbesborniz. 
Brightwelli. 
priodonta. 
Baltica. 
pectinata. 
. tremula. 
oblonga. 
. platyptera. 
ardas. 
longtseta. 
mystacina. 
breviseta. 
saltator. 
brachionus. 
clavulatus. 
hyptopus. 
. entrusor. 
natdats. 
annulosa. 
Saunderste. 
Libba. 
leptura. 
constricta. 
aurita. 
collarts. 
cyrtopus. 
