50 THE KOTIFERA. 



NoTHOLCA FOLiACEA, EJireiiberg (PI. XXXIV. fig. 35). 



Anuraa folia cca Ehrenberg (42). 



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

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



This Anuraa 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, y|^ inch. Habitat. Berlin (Ehr.). 



Notholca heptodon, Perty (PL XXXIV. fig. 34). 



Anurixa heptodon Perty (124). 



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

 in front, and tapering to a short, sharp, slightly upturned spiine behind ; dorsal plat 3 

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

 hut box -like. 



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

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

 creature, at Piochdale, 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 draw^l together, with the membrane projectmg, in a fold, between them. 



Length, -[ Ig^ inch. Habitat. Bern (Perty) ; Rochdale (T. S. Spencer). 



Notholca stiuata, Ehrenberg (PI. XXXIV. fig. 33). 



Anuraa striata Ehrenberg (42). 



Anuraa baltica Eichwald (45). 



SP. CH. Lorica linear, elo7igated, 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 mider surface of the lorica. Ehrenberg found it both m 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 Anuraa baltica is probably the same 

 animal. Eichwald's figure and description give only six longitudinal stria; ; 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 striiB. 



Length, y.^^ inch to y|f inch. Habitat. Copenhagen (Miiller) ; Berlin (Ehr.). 



Notholca jugosa, Gosse (1G9), (PI. XXXI. fig. 59). 



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

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

 hind margin. 



This, of all the Notholca, seems to come the nearest to Ehrenberg's figure of Anuraa 

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

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

 the Firth of Tay and of the Devon coast. 



Length, -p,J^ inch to -j-^ inch. Habitat. Marine. P.H.G.] 



Notholca ehomboidea, Gosse (169), (PI. 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. 



