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1018 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [18] 
Of Hypotrricu# I found Chilodon cucullulus a few varieties of Hrvilia 
and Dysteria (not quite the same forms which I observed on the coast). 
Related to these there is another form, also new in our fauna, and which 
js principally distinguished by dark grains of pigment scattered irregu- 
larly all through the body, and found in unusually large masses in a 
certain place close under the surface, and only covered with a strongly 
convex somewhat broad elevation of the ectosarc* entirely free from 
grains, which doubtless answers the purpose of a lens. This variety is 
moreover distinguished by an unusually wide and perfectly straight 
esophagus. 
Among the few ASPIpISsc.z I noticed Aspidisca limbifera which I had 
also observed in the Helder, and which is distinguished by a fine wavy 
hem running along the right side and round the edge of the back part. 
Of the EupLoTES I found here, as well as near the coast, a variety 
closely related to Stéin’s Huplotes harpa (from the Baltic), and distin- 
guished from this one principally by a more regular inner edge of the 
peristome (‘ Stirnrand” of Stein). Just as in the coast-waters I again 
found two sizes of this variety closely resembling each other, and but 
few intermediary stages. Of Huplotes longipes Cl. Lachm., recently de- 
seribed by me in an article, “ Zur Kenntniss der-Bewimperung der Hypo- 
trichen Infusorién,” 1 found large numbers. I likewise found Stein’s 
Uronychia transfuga resembling the Campylopus paradoxus of Claparéde 
and Lachmann. On account of its restlessness this variety presents 
unusual difficulties to the observer. It is my opinion, however, that all 
three varieties belong to the same genus (Uronychia). 
Of the genus STYLOPLOTES, which is related to the HUPLOTES and 
URONYCHLA, I found, besides Styloplotes grandis mihi (also described in 
the above-mentioned article), and a small variety which I had noticed 
in Niewwediep, a third kind, but only in small numbers. 
Besides some small OXY TRICHIN& I also found the beautiful Oxytricha 
saltans (Actinotricha saltans, Cohn), which immediately strikes the eye by 
its four strong adoral ciliary plates. I also noticed some varieties of 
the group STICHOTRICHA and UROLEPTUS, amongst the rest the Oxy- 
tricha auricularis Cl. Lachm., but, as on the coast, in very small number. 
Cohiwvs Oxytricha flava, which does not belong to that group, but rather 
to that of UROSTYLA, of a beautiful orange, red, or brown color, was 
also found here, but not in as large numbers as in the sea. Cohn, in 
his Ulustrations, does not show the proper distribution of color on this 
animal; the color is exclusively found in small but very distinct little 
balls or bags, which refract the light, and are arranged in rows. The 
very rapid changes of form to which this animal is subject, make it 
very difficult to make accurate observations of it. 
Of the group of PERITRICHA I found only a few forms, a few varie- 
ties of the genus Vorticella and Zodthamnium, the same as on the coast. 
* Cf. foot-note on p. 6. The same remark applies here as to entoderm and mesoderm.— 
TRANSLATOR. 
