57 



The ridges, in this species, can with difficulty be discerned, especially as the rotating 

 head is habitually protruded, which the creature does not retract for the shock of any 

 tap or shake of the instrument that I can give. There is a long wrinkled oesophagus, a 

 great saccate stomach, a distinct intestine, with the cloaca at the very extremity of the 

 lorica : the branchial bands are distinct, but no contractile vesicle. It is not uncommon, 

 with the preceding. 



Length, ^ inch to T 7 inch. Habitat. Marine. P.H.G.] 



NOTHOLCA SPINIPEBA, Gosse (169), (PL XXXI. fig. 57). 



[SP. CH. Lorica broadly sub-rhomboidal ; the dorsal plate often less than the ventral 

 and separated by a wide and deep cleft ; at each angle of junction is seated a short spine 

 so hinged as to be concealed within the cleft, or widely projected, at will. 



An interesting and attractive species. The whole interior is often richly coloured, 

 especially the enormous stomach. An ample contractile vesicle is present. The hind 

 outline in some examples is evenly rounded ; in others an inangiilation marks both 

 plates. Ehrenberg's figure of Anur. biremis may be compared with this ; but it differs 

 in important details ; and his text gives no help. I received this also from the Tay 

 tide-pools. 



Length (of lorica), T .^ to y^y inch. Habitat. Tay tide-pools. P.H.G.] 



NOTHOLCA POLYGONA, Gosse (169), (PI. XXXI. fig. 60). 



[SP. CH. Lorica roundly pe,ai --shaped, truncate in front ; the central pair of the 

 occipital spines stout, the other two pairs almost obsolete; ventral plate forming a 

 square box, with sloping, many-angled sides. 



A remarkable form. The dorsal plate is a half-oval, the ventral nearly flat. The 

 latter is very peculiar : a kind of sub-cubic box, open at the summit, runs down to about 

 three-fourths' length, and then proceeds, in pyramidal form, to a point at bottom ; and 

 this appears to contain the viscera. Each side is covered- in by a plate of two planes, 

 but appears to be empty. On those parts of the arched dorsal plate which answer to 

 these empty lateral chambers, run down very delicate flutings, while the broad medial 

 part is quite clear and smooth. All the angles are distinct. The only example seen 

 was dead, but showed a crimson eye and a normal mastax. 



Length, T J^ inch. Habitat. Kingswood pool, near Birmingham. P.H.G.] 



NOTHOLCA LABIS, Gosse (171), (PL XXXI. fig. 56). 



[SP. CH. Almost the very counterpart of N. scapha, save that the outline is a 

 longer oval, and the lorica is prolonged into a short, broad, truncate tail behind. 



One of the discoveries of Mr. Hood of Dundee, who finds it numerous in a pool in 

 Emmock Wood, near that city. He has repeatedly sent me specimens, but hitherto all 

 have been dead on arrival. The little tail to the lorica reminds one of the handle 

 of a dust-pan, if so homely an illustration can be tolerated. The ridges and furrows 

 from the frontal spines are almost obliterate. , 



Length, ^\ 6 inch. Habitat. Lacustrine, near Dundee (J.H.). P.H.G.] 



Genus GOMPHOGASTEE, Force (210). 



GEN. CH. Lorica thick, box-like, enclosing the animal completely, except for a narrow 

 slit-like opening upon the anterior ventral portion, cuneate in both dorsal and lateral 

 aspects, triangular in transverse section, the ventral side the apical ; foot jointed, and 

 usually retracted within the lorica ; toe apparently single ; corona apparently single, 

 cilia robust, set in a single (?) marginal row, disc not much expanded beyond lorica 

 when extended; a stout retractile horn-like process protruded from each dorso-lateral 

 corner of the lorica, when corona is extended. 



