50 THE ROTIFERA. 



NOTHOLCA FOLIACEA, Ehrenberg (PL XXXIV. fig. 85). 

 Anurcea foliacea ...... Ehrenberg (42). 



SP. CH. Lorica oblong, with six spines in front, and tapering to one spine behind ; 

 dorsal and ventral surfaces with longitudinal ridges and a rough zone in front. 



This Anurcea of Ehrenberg's will fall into Mr. Gosse's new genus of Notholca. 

 Ehrenberg gives few details of its structure, but notices that there are four teeth in each 

 uncus, and that there is an obvious brain lying under the eye. 

 Length, T |^ inch. Habitat. Berlin (Ehr.). 



NOTHOLCA HEPTODON, Perty (PI. XXXIV. fig. 34). 

 Anurcea heptodon ....... Perty (124). 



SP. CH. Lorica an elongated oblong, with a wavy striated surface ; with six spines 

 in front, and tapering to a short, sharp, slightly upturned spine behind ; dorsal plate 

 convex ; ventral concave, and so set that its side view of the lorica is not wedge-shaped 

 but box-like. 



This Notholca was discovered by Perty at Bern, and described from a solitary 

 specimen. Mr. T. Smithsoii Spencer has lately found what, I think, is the same 

 creature, at Rochdale, and has favoured me with a drawing of it. Both observers 

 describe the lorica as unfaceted and with wavy longitudinal ridges and outline. 



Mr. Spencer says that a membrane connects the two plates behind ; and that he has 

 seen them drawn together, with the membrane projecting, in a fold, between them. 



Length, T ^ inch. Habitat. Bern (Perty) ; Eochdale (T. S. Spencer). 



NOTHOLCA STKIATA, Ehrenberg (PL XXXIV. fig. 33). 

 Anurcea striata ...... Ehrenberg (42). 



Anurcea baltica ...... Eichwald (45). 



SP. CH. Lorica linear, elongated, with six spines in front, and rounded behind ; 

 its dorsal plate with twelve longitudinal stria. 



Miiller discovered this Notholca in sea-water at Copenhagen in 1779, and gave three 

 figures of it, of which one is probably a mistake for Anurcea biremis ; as it shows two 

 curved spines on the under surface of the lorica. Ehrenberg found it both in fresh 

 water and in the sea, and noticed that the membranaceous lorica changed its form with 

 the contractions of the body. He also observed three teeth in each uncus, and a nervous 

 ganglion close to the red eye. Eichwald's Anurcea baltica is probably the same 

 animal. Eichwald's figure and description give only six longitudinal striae ; the two 

 mid-strife stop short just above the mastax ; and the other four stop at the margin of a 

 semicircular opening in the ventral plate. Probably the viscera obscured his view ; 

 moreover he admits that occasionally he could see twelve longitudinal striae. 



Length, T ^ inch to T ^ 4 inch. Habitat. Copenhagen (Miiller) ; Berlin (Ehr.). 



NOTHOLCA JUGOSA, Gosse (169), (PL XXXI. fig. 59). 



[SP. CH. Lorica ovato-rhomboid, highly elevated, broadly truncate before, 

 narrowly behind ; ridges and furrows strongly marked, ending before, they reach the 

 hind margin. 



This, of all the Notholcce, seems to come the nearest to Ehrenberg's figure of Anurcea 

 striata ; of which he says, it is marine at Copenhagen, associating with Pter. clypeata 

 and Brach. Mulleri, species with which jugosa is commonly found in the tide-pools of 

 the Firth of Tay and of the Devon coast. 



Length, ^ inch to ^ inch. Habitat. Marine. P.H.G.] 



NOTHOLCA RHOMBOIDEA, Gosse (169), (PL XXXI. fig. 58). 



[SP. CH. Lorica rhomboidal, with lateral angles rounded, the front produced and 

 truncate ; dorsal and ventral plates separated behind by a short cleft. 



